Love that you went over the wiring portion of this. Maybe I’m the lone geek of the group but I like working on these electrical systems. Making it look oem and tying into the factory system is definitely the way to go 👊
On my wife's 04 Tahoe, I built a long wand out of 1/4" plastic toilet / sink feed line, drilled 20 or so tiny holes all evenly in one side, plugged one end, and hooked up my air gun to it. I lowered it down vertically between rad and A/C cooler forcing air forward through the cooler, a ton of dirt / dust came out and her A/C has stayed blowing cold.
Not into GM at all, but gotta say, this is the best tutorial on how to wiring e-Fans I've come across youtube so far. Kudos to LSXMatt and Tahiti!! Can't wait to see what's coming to both your cars. This put me in a mood to do some mods to my old Ford Tempo.
I did this to my 03 Tahoe LT about 16 yrs ago when i had to change my water pump, best thing i ever did for it lol. Still running strong. Had a guy in queens tune my truck the same time
Best thing you can do to a non E fan equipped truck!! I did it to my 00 GMC, and 02 Tahoe. Especially here in the desert. Stoplight with A/C going with that crap mechanical was miserable, even when trucks were new, swampy as humid air. It really shined when I pull a water trailer to wet down the tractor truck yard, chill air ( 110 day 55 degrees vent temp) at 3 mph letting the water tank pump spray down the yard. I did have to upgrade the radiator on the GMC as I wanted the tow package radiator. Tahoe came with big rad from factory. I used fans off of 08 6.0 Escalades for both. I did buy the harness from BP Automotive, I also got the optional high pressure switch from them that uses A/C high pressure to kick on fans not just temp. I also added a 300 amp alternator. Your wiring skills are like my brothers, good job. ( Hes retired now from Denver Intl Airport) I did see a 1 MPG increase on the GMC, nothing on the Tahoe.
I have an 03 burb with 5.3 LM7. I’ve been thinking about swapping to oem efan to help mpg and some more hp? 2003-2004 5.3 285hp. 2005-2006 5.3 295hp. Only difference is flex fuel compatibility and switch from mechanical to electric fans. Guessing the fan switch is what netted the +10hp.
An in depth video but this is one of the best videos detailing the conversion from a clutch fan. It’s helpful for me doing one on a 2011 suburban. It’s a 2500 with the 6.0 and clutch fan. I’m 99% complete and the review of the HP tuner was the last bit of OEM info I needed. Thank you!
I have the exact same suburban and I’m trying to do the electric fan conversion as well. Would you mind sharing everything you are using for the conversion? Thanks in advance
Feels like forever that I’ve been waiting for this episode!!! Thanks Matt for making such great videos. You’re the reason for my recent purchase of a 2002 Tahoe! Bought Efans when you first hinted at this conversion.
I have an 2003 burb with 5.3 LM7. I’ve been thinking about swapping to oem efan to help mpg and some more hp? 2003-2004 5.3 285hp. 2005-2006 5.3 295hp. Only difference is flex fuel compatibility and switch from mechanical to electric fans. Guessing the fan switch is what netted the +10hp.
I just did this upgrade on my 03 Yukon Denali and I bought a harness new on eBay for 50 bucks plugs in ecm program the ecm with efi live works fantastic
I just came across your channel and stumbled upon this build. Watched all of them to now... now I'm subscribed and waiting on the next vids! ABSOLUTELY awesome!
Be sure to check the temp with a scanner. The stock gauge in these are kinda like a dummy gauge. 185-220ish will sit right around the 210 mark before going over.
That's because the engineers have determined that those temperatures are "ok" and within normal operating spec. Beyond and below that the needle will move to reflect the actual temperature. Billy Commuter and Sally Home maker will bring the car to the mechanic if they see the temperature needle moving; even though it's not in the red. On older cars that's not the case. My 91 Mercedes diesel reflects the correct coolant temperature ALL THE TIME. It's pretty cool watching it cycle through its motions. Leave the AC on with the car idling in the hot garage (our garage isn't insulated) and you'll come back to ~115*C temperatures with the fans on high. It doesnt get higher, just kinda sits there.
I fab'ed one of these into the wife's 99 2dr Tahoe. Had to do some creative trimming and mounting but got it in and wired up quite cleanly. I did make a whoops and wired both fans into one relay almost melting the poor thing. Rewired two relays and it works like a dream.
I got a 2003 chevy tahoe. With 190,000 miles on it. I really Love it. Best vehicle I've bought for awhile. Really comfortable an gets pretty good fuel mileage for being 6800 pounds haha
I did the same to my 03 Silverado, trust me you won't be disappointed. I commented back on one of your old videos and told you that you would love them. I bought the harness for mine though
I just replaced our '05 3500 rad and fan clutch. Amazing AC performance while parked in the heat, so much power drag everywhere else. A manual pusher + Buick 3.8L eFan conversion time! Thanks for the vid!
I've been wanting to do this conversion for yrs on my 03 Tahoe. I have all the parts, including the factory harness lol. FYI-- fans up to 2014, are all the same. You def don't want to use an aftermarket harness. They don't hold up. On a really hot day if the electric fans kick on alot, the harness will melt. So if you can grab a factory harness, along with the convenience center with all the relays for the fan, do it. Another thing to think about---you probably have the 130-145 amp alternator, so you might want/need to upgrade to a 160 amp alternator. When those fans kick on they do pull power, and if you have the ac going, along with music, headlights are on etc, your amp gauge will dip. Keep an eye on that shitty Amazon wiring! Def don't want them to melt either. Again--these fans do draw power. Nice vid--again 👍🏻
Glad you ended up with 10AWG wire, these fans are power hungry. Oh and 10AWG wire is typically only rated to 30A, so you are stretching it a bit with the 40A fuses. Probably fine, but melting wiring is never fun. Bigger wire means less resistance through the wire, and less stress on the relays/fuses. You have to watch out on the cheaper wire, anything under the hood should really be GXL or TXL automotive wire, because it is rated to 125C (257F) and way better suited for under hood temps. Most common off the shelf wire is only good to like 80C (176F). All the factory wiring is either GXL or TXL under the hood, and probably throughout the vehicle really. I skimmed through most of the video but it looks like it was well detailed, this is a very nice resource for this mod. Thanks
I'm going to be doing this to my 99 silverado in the spring after the snow is gone and I can get outside and work on it. I noticed your fan relay box there only has contacts for the relays and 3 fuses...did you see that? they make it look like you have room for upgrade but in reality those are just extra "holders" kind of like the "12ga wire"
I did a Hayden dual fan module,With the Radiator Probe the only thing is fans would over heat it and burn up,So the leads to the fans I threw in a 60amp relay to each fan and haven't had any problems.Great video.
I have a stock & beautiful 02' Blazer ZR2 4.3 & it's always ran below 210° down here S of Houston where it gets hot! Now days it's running around 210° with a 195° thermostat & a tad higher when towing a small 5x9' utility trailer. Like 220° which it's never ran that hot or warm. I've flushed the radiator, installed a new Severe Duty Clutch Fan (that I only hear on start up) , new coolant after the flush & new 195° thermostat. I can't hear the new clutch Fan & I have no idea what temp they are supposed to kick on at, I did see somewhere that the Hayden 2786 Fan kicks on around 180° but I don't think so. Maybe I'm freaking out over nothing. It's just always ran around 200° max. (Just left of the 1/2 way mark on gauge) the gauge is good because I can see it when the thermostat opens at 195°. So IDK.
It varies , back in the 70's removing the clutch fan was one of the most popular " bolt off " mods done , it is called parasitic horsepower drag .....most often replaced with a flex fan , where at high RPM the blades flatten out ......high RPM is where it is most noticed improvement
Glad the fans worked out, definitely have to do mine. Took at shot in the dark at the local dealer to see if they could unlock fan control while they were programming my master window switch, no dice. have to check the local tuner to see.
Matt! I love your attitude, your superb mechanics skills and knowledge, the clarity in which you teach others, and the fact so far I've never heard a cuss word so my Grandson who's 8 can watch and learn too. You're helping alot of people Brother, especially me, just bought my 3rd Yukon, only have 1 but have owned others in the past but mine has issues. It's a 2000 YUKON 4X4 5.3 SLT, 328,000 but you would never know, it looks clean and nice. My transmission hits hard in 2nd & 3rd, BUT ONLY after highway speeds, 50 mph & over. Then when I start again from a stop once first gear goes into 2nd, it hits hard, then the next gear, 3rd, then the next gear is a smooth transition. NOW HERES THE THING, ANYONE CAN ANSWER BUT I HOPE MATT DOES TOO. When I get off the highway I pull over at the nearest safe spot, shut the truck off for 2 minutes, start it up, goes through all the gears just fine, AS LONG AS I KEEP IT AT AROUND TOWN SPEEDS, UP TO ABOUT 45 MPH seems to be the sweet spot to keep it shifting correctly. HERE'S MY QUESTION: I I replace ALL the Solenoids located under the trans pan do you think that should fix my issue? I already replaced the shift sensor located on the driver's side of the throttle body. Any help would be greatly appreciated...
Sounds like your transmission needs a maintenance or (hopefully not) a rebuild. Greets from Germany, I drive a 6" suspension lifted '03 Suburban on 35s. Shop had to rebuild my 3rd n 4th gear last winter.
@@Rokx80 Sorry to hear you had to rebuild the gears, and thank you for the information. Your truck sounds nice. Mine has a 3in lift but going to a 6 eventually myself too. I'm going to replace the Solenoids in the 4L60-E Transmission first, if that doesn't work off to the tranny shop to spend about $2,500.00 to rebuild it. The truck is worth it, everything is pretty much new already from having to upgrade many parts this last year since I bought it. They're only going to go up in value, especially when the world is getting worse and worse, people are going to want 4x4's and trucks to bug out. My truck is my BUG OUT VEHICLE, it's set up for overlanding. Cheers from Southern Utah U.S.A. Brother. I live in America but I'm Welsh & Scott's Irish.
I appreciate ya Matt, I have a 99 chev tahoe two door that I'm building now and am incorporating pretty much everything you have on yours, your videos are not boring as shit like most
I did this recently with my 02, pin 33 was still having issues with my Blue/Red ECU connections, had two ECU’s programmed. Couldn’t get it to work, so I just spliced into pin 42 and solved my issue. But love your clean install.
@@jimmyramirez8844 honestly I can’t remember but I had to jump the wire for both fans to work. I have a red green connector on my ECU, from what I gathered is you want red blue connectors or an ECU from a red blue.
I have a 2003 Tahoe Z71 Have the fans and I used the Nelson after market harness ! ( was telling my lady I wired the power the way you Finally did it ! Where did you get the download for flashing the computer ! I'm a Jersey transplant in Colorado and now one knows what I'm talking about flashing the computer ! I have all the temps and sure I could do it! (novice) found one place to flash it and they wan't my first born in return ! I'm visiting Jersey in a few weeks and would go to Lakewood to have it done if it's reasonable !
I have a Black Bear Performance tune. They turn the efans on by default with any tune for the GMT800’s imho, it’s probably the best mod you can do for these trucks (BBP tune) it’s a little spendy, but so worth it!
Thank you for a very well instruction Efan upgrade. I've got everything to make the conversion except someone with HP tuner to help flash the ECU. Can one be rented?
That relay box is nice I got just some cheap relay harness things with pig tails and had one or both melt and I had to re run some but I did find some relay sockets that you crimp the actual connections like yours but just individual which I highly recommend and it just makes things cleaner
I knew the aftermarket harnesses had 3 relays and just assumed it was to run both fans while the A/C was on but now I see you run them in series to get both on a low speed I figured the tune says fan 1 and fan 2 so I figured it didn't matter but I assume that if mine calls for fan 2 it will cut off my fan 1 I don't really test that they both work manually like you did
I just completed this upgrade. I bought an aftermarket harness. When I trigger fan stage 1, it goes to high speed. When I trigger fan stage 2, it goes to low speed. The trigger wires are blue and green. I matched them to the PCM plug of corresponding color per my instructions. I'm figuring the harness is just backwards.
Matt i had a tuner set up my computer on my 2001 chevy silverado. It had the wire pined on pin 33 red cover and i took it off as you mentioned. I went ahead and plugged in the new wire from the ac fans relay box from factory. The tuner set it up as 2 fan and analog. With the analog setting the compressor keeps running and doesnt cycle and it freezes up my ac and stops working. Do you have any idea or do you recommend something? Thank love your videos 👍
@@gerardolopez5875 No I had the tuner put the settings back to analog cycling that the only way the ac doesn't freeze and the compressor cycles how it should. The only downfall is the that fan 1 is always on but it doesn't hurt anything. The cooler the engine runs more horse power. The only way to fix the issue is to change the computer to a 2004 to 2006.
@@macielandsons @ agree, I’ve done 5.3 on 2 of my c10s with 04 harness/pcm, And using 3 pin transducer, its the way to go, Here the only downfall its drive by wire,,, But on my 2001 silverado, Iam just planning the best way to electric fans,
Excellent. Get a tube of automotive electrical silicone grease and put some on each fuse & relay pin when assembling. In fact use it on all the electrical connection points. If the Auto Zone guy looks weird (or tries to sell you tiny light bulb packets of the stuff for way too much money) just find someone who knows what you are asking for. It will prevent corrosion down the road and helps a lot with the cheap Chinese metal used in pins and fuse blades.
Just installed a set of electric fans on my 03 gmc yukon denali. I just have one question at what temperature are they supposed to turn on. My temperature goes past the 210 for sure with my old clutch fan temperature was below 210. I feel like is gunna overheat never seen it go more than 210 is this normal?
If you have HPTuners, just copy the settings from a vehicle that came with them from the factory (like an '06 Tahoe or whatever). 210 is normal though, should stay at that temp and really never go over unless you're towing something heavy.
Amazon has a harness made specifically for the conversion for $70. I did the conversion on my silverado and got the computer tuned to turn them on. It works perfectly. No need for Nelson performance
Ok video but you confused the hell out of me with the hp tune ac recirqe 02 and down. Cut the wire? Like if you made the harness vs using the factory harness? Do I put it on fan2 using the factory harness or your only changing that for the home made harness?
My 03 Yukon Denali is doing the same thing, you can hear that "big diesel rig" whine when it accelerates, and the AC blows warm at idle. Also it seems the recirculate switch isn't actually closing it off.......thoughts?
You should check your refrigerant level. My trailblazer i run two electric fans from a 2002 camaro. With both fans on with low refrigerant was cold but not super. Then once I was able to determine my shrader was leaking it was cold even with no fans on at all.
Another great mod! I am not great at wiring & prefer to use the factory harness. Any posdibility you could go over the necessary steps to installing the factory harness? Thanks for sharing all your mods!
Thanks for the video. I’m looking to do this upgrade on my 2003 Sierra 1500. I have already picked up a larger radiator and will hopefully get the fan assembly and factory harness in a few weeks. My question is about the computer tuning to tell the fans to turn on. Will this work on my 2003? And if I can’t find a local shop to do it do you know any mechanics I could send the ecm to tune it?
Who did your tuning for the efans I have my efans on but the tune isn’t working right it drops the volts with the ac on when I come to a stop. Already have a new 130amp alternator
I have an 03 yukon denali with the factory clutch fan, do you think it’s worth it swap to the e fans? How difficult would you rate this install? I’m scared of messing something up especially with the wiring.
You can buy a kit that makes it plug and play, definitely worth it, just for the space it frees up under the hood alone. Your AC will work better because the fans move more air at idle than the clutch fan can. Did this on my '01 Suburban, still need to do it on my '03.
Matt you should put fuseable links where your 12v+ tie into you main fuse block lug. Otherwise you have those 2-3 feet of wire un fused. Not a huge risk but for me worth doing.
I've never done the "tune" when doing the "E-fan" conversion, I use the factory fans with a "Stand-alone" controller from Flex-A-Lite. Been doing this since 2007, with absolutely 0% negative effects. The Flex-A-Lite controller has a temperature control range from 160°-210°. I always set it to around 170°-180° & it fires the fans up like clockwork.
Buying credits solely for the purpose of triggering some fans seems a bit extra, I'll do it on mine at some point but only because it's already unlocked. We've all got different priorities when it comes to budgeting i suppose.
You need to upgrade alternator. Phoenix last summer at idle ran my voltmeter to like 9-10. I did those fans on my 2000 Escalade. It really did clean up the engine bay. I now have a 2004 Escalade ext that surprisingly came without electric fans. I’m going to do this to this one now but like I said I also need to upgrade alternator to a 300 amp one or higher. Those fans have a huge current draw.
Hey matt i just did the e-fan upgrade on my 01 sierra. I put the settings to analog like u said in the video and a few other videos sUd the same thing you did but my a/c lines are freezing up. Someone said i need to set it to serial cycling instead. Any input on this?
@@charlesp7574 i talked woth a fre guys and they told me to pit the settings to analog cycling and i havent had it freeze up cince. I did re adjust my fan perimeter as well but only because i changed my thermostat size from a 160 to a 187.
So I did my efan swap. Pinned both wires to the PCM that was reprogrammed as needed. Did all of this with a harness removed from a known good 2005 Silverado. Now I'm stuck chasing a problem I haven't seen in watching at least a dozen videos about this swap.... my relays are going nuts. I haven't done any wire chasing, mostly because I don't know where to start. It's not like there is room for any level of mistake. If the fans are plugged in backward then the wrong fan comes on. If the PCM pins are wired backward then, again, the wrong fan would come on. What it sounds like is that the PCM is pushing a PWN signal to the fans. All 3 relays are clicking away at about 15 Hz, but slightly offset. WTH is going on?
I have an 04 Silverado and want to do this swap. Would I have to use the factory PCM and tune it to run the fans, or I could I use the PCM out of the donor truck. I know GM has different “color coded” PCMs. Like yours is green and blue.
Sir, I have a 2001 gmc Sierra SLT 1500 5.3 I’m wanting to convert the glutch fan to e fans I live in El Paso texas where can I go to have this done, I mean what kind of shop would I be looking for, I’ve heard that the wording harmed and Altima tot had to be up graded, nit sure how true that is, thank and I’m now following you as to your intelligence to you how to do.
Yet another fantastic video! Super Appreciated 😀 👍I can't wait to do the swap once I get all the needed goodies. Question on the Tune what were they able to add over the stock Tune? As I just purchased an 03 Z71 and looking to add as much as possible without replacing headstones, cams etc for Now. Thanks Eddie J. Long Island N.Y
You can change it however you want. With HP tuners you can tune everything yourself. Or you can data log and find a good tuner to do it. These engines really wake up with a good tune. I’ve watched quite a few tuning videos trying to learn on HP tuners and you would be amazed by how much GM dumbed down the factory tune. I guess it was to please the epa.
Im about to do this mod on my 04 avalanche. I have the fans and harness. Would it be worth buying hp tuners and doing it myself and did hp tuners cost? This is a great video btw. If I was this video before I bought harness I definitely would be wiring up fans they way you did yours.
![Lp. Сердце Вселенной #60 РОЖДЕНИЕ ЛОЛОЛОШКИ [Финал] • Майнкрафт](http://i.ytimg.com/vi/YoR0pAV9FVQ/mqdefault.jpg)
Love that you went over the wiring portion of this. Maybe I’m the lone geek of the group but I like working on these electrical systems. Making it look oem and tying into the factory system is definitely the way to go 👊
I don't like doing wiring but it's always nice to see someone do it so you can get pointers and see if they do something better
You're not alone... 😂👍
0:22 0:23 0:37 0:38 0:42
Nah I try my hardest to make everything aftermarket under the hood especially wiring look factory it’s just clean and simple
On my wife's 04 Tahoe, I built a long wand out of 1/4" plastic toilet / sink feed line, drilled 20 or so tiny holes all evenly in one side, plugged one end, and hooked up my air gun to it. I lowered it down vertically between rad and A/C cooler forcing air forward through the cooler, a ton of dirt / dust came out and her A/C has stayed blowing cold.
I wish you had made this video 3 months ago when I did my fan swap. I managed to do it successfully but nobody else has a video as good as this one.
Stapleton had a great video of it with a Yukon xl.
How did you do the pcm flash
Not into GM at all, but gotta say, this is the best tutorial on how to wiring e-Fans I've come across youtube so far. Kudos to LSXMatt and Tahiti!! Can't wait to see what's coming to both your cars.
This put me in a mood to do some mods to my old Ford Tempo.
I did this to my 03 Tahoe LT about 16 yrs ago when i had to change my water pump, best thing i ever did for it lol. Still running strong. Had a guy in queens tune my truck the same time
Best thing you can do to a non E fan equipped truck!! I did it to my 00 GMC, and 02 Tahoe. Especially here in the desert. Stoplight with A/C going with that crap mechanical was miserable, even when trucks were new, swampy as humid air. It really shined when I pull a water trailer to wet down the tractor truck yard, chill air ( 110 day 55 degrees vent temp) at 3 mph letting the water tank pump spray down the yard. I did have to upgrade the radiator on the GMC as I wanted the tow package radiator. Tahoe came with big rad from factory. I used fans off of 08 6.0 Escalades for both. I did buy the harness from BP Automotive, I also got the optional high pressure switch from them that uses A/C high pressure to kick on fans not just temp. I also added a 300 amp alternator. Your wiring skills are like my brothers, good job. ( Hes retired now from Denver Intl Airport) I did see a 1 MPG increase on the GMC, nothing on the Tahoe.
I have an 03 burb with 5.3 LM7. I’ve been thinking about swapping to oem efan to help mpg and some more hp? 2003-2004 5.3 285hp. 2005-2006 5.3 295hp. Only difference is flex fuel compatibility and switch from mechanical to electric fans. Guessing the fan switch is what netted the +10hp.
I'll be tackling my wife's 01 Silverado this week and I am feeling a lot more confident after watching this video, thank you so much Matt!
An in depth video but this is one of the best videos detailing the conversion from a clutch fan. It’s helpful for me doing one on a 2011 suburban. It’s a 2500 with the 6.0 and clutch fan. I’m 99% complete and the review of the HP tuner was the last bit of OEM info I needed. Thank you!
I have the exact same suburban and I’m trying to do the electric fan conversion as well. Would you mind sharing everything you are using for the conversion? Thanks in advance
You just made my Friday night. Fridge right here. Gonna pound beers and watch the hell outta this video! You rock, Matt!
I can tell you're a wiring geek like me. Nice job and thanks for including that part. Not boring to me.
These fans🔥
I can’t wait till you do the leveling kit I’m trying to do that to my 2004 Tahoe 2wd
yep. but all can do it witout pinning and flashing. with 2 relay and 2-step termal swich in collant hose.
Worth it just for the extra working space under the hood
@@JPVolvo extra space ? 2 little relay . 1 speed - fans connected serial , 2 - parallel .
Matt your the best man, I love your videos and have a 2000 Chevy Camaro z28 so I love watching your Camaro content
Feels like forever that I’ve been waiting for this episode!!! Thanks Matt for making such great videos. You’re the reason for my recent purchase of a 2002 Tahoe! Bought Efans when you first hinted at this conversion.
I have an 2003 burb with 5.3 LM7. I’ve been thinking about swapping to oem efan to help mpg and some more hp? 2003-2004 5.3 285hp. 2005-2006 5.3 295hp. Only difference is flex fuel compatibility and switch from mechanical to electric fans. Guessing the fan switch is what netted the +10hp.
Been waiting !! Now time to convert mine.
Badass man! I’ve been wanting to do this conversion for a while. Really cool that you did the 0-60 tests as well! Awesome results!
I've been watching most of all your videos on Tahiti! They have helped me out a lot ! Especially the brake upgrade. That was awesome!
I just did this upgrade on my 03 Yukon Denali and I bought a harness new on eBay for 50 bucks plugs in ecm program the ecm with efi live works fantastic
Can you show the link to buy the harness I have an 03 denali as well
Thanks for all of your videos bro they are helping me fix up my 2001 GMC Yukon Denali 6.0
I just came across your channel and stumbled upon this build. Watched all of them to now... now I'm subscribed and waiting on the next vids! ABSOLUTELY awesome!
Be sure to check the temp with a scanner. The stock gauge in these are kinda like a dummy gauge. 185-220ish will sit right around the 210 mark before going over.
That's because the engineers have determined that those temperatures are "ok" and within normal operating spec. Beyond and below that the needle will move to reflect the actual temperature.
Billy Commuter and Sally Home maker will bring the car to the mechanic if they see the temperature needle moving; even though it's not in the red.
On older cars that's not the case. My 91 Mercedes diesel reflects the correct coolant temperature ALL THE TIME. It's pretty cool watching it cycle through its motions. Leave the AC on with the car idling in the hot garage (our garage isn't insulated) and you'll come back to ~115*C temperatures with the fans on high. It doesnt get higher, just kinda sits there.
I fab'ed one of these into the wife's 99 2dr Tahoe. Had to do some creative trimming and mounting but got it in and wired up quite cleanly. I did make a whoops and wired both fans into one relay almost melting the poor thing. Rewired two relays and it works like a dream.
The quality of work you do is amazing
Thats a neat little wrench! 3:41 Very handy!
Love how Tahoe/Yukon same in many ways. I had e-fans. I saw no real difference in gas mileage. Stuck with traditional set-up. Nice video
I got a 2003 chevy tahoe. With 190,000 miles on it. I really Love it. Best vehicle I've bought for awhile. Really comfortable an gets pretty good fuel mileage for being 6800 pounds haha
I did the same to my 03 Silverado, trust me you won't be disappointed. I commented back on one of your old videos and told you that you would love them. I bought the harness for mine though
With the factory harness was it just plug and play or did you have to still get into the computer to wire to the pins
@@daddyshark3896 I bought an aftermarket harness that was built for these fans, still had to pin the computer plug and tune it
@@daddyshark3896 even with a factory harness you would have to tune it regardless
@@USArmy05 oooh ok sounds good
I just replaced our '05 3500 rad and fan clutch. Amazing AC performance while parked in the heat, so much power drag everywhere else. A manual pusher +
Buick 3.8L eFan conversion time! Thanks for the vid!
I've been wanting to do this conversion for yrs on my 03 Tahoe. I have all the parts, including the factory harness lol.
FYI-- fans up to 2014, are all the same. You def don't want to use an aftermarket harness. They don't hold up. On a really hot day if the electric fans kick on alot, the harness will melt. So if you can grab a factory harness, along with the convenience center with all the relays for the fan, do it. Another thing to think about---you probably have the 130-145 amp alternator, so you might want/need to upgrade to a 160 amp alternator. When those fans kick on they do pull power, and if you have the ac going, along with music, headlights are on etc, your amp gauge will dip. Keep an eye on that shitty Amazon wiring! Def don't want them to melt either. Again--these fans do draw power. Nice vid--again 👍🏻
its a voltmeter not amp. Cool story though.
@@mann_idonotreadreplies you are correct!
Good to know about the larger radiator interchangeability! 4:59
Glad you ended up with 10AWG wire, these fans are power hungry. Oh and 10AWG wire is typically only rated to 30A, so you are stretching it a bit with the 40A fuses. Probably fine, but melting wiring is never fun. Bigger wire means less resistance through the wire, and less stress on the relays/fuses.
You have to watch out on the cheaper wire, anything under the hood should really be GXL or TXL automotive wire, because it is rated to 125C (257F) and way better suited for under hood temps. Most common off the shelf wire is only good to like 80C (176F). All the factory wiring is either GXL or TXL under the hood, and probably throughout the vehicle really.
I skimmed through most of the video but it looks like it was well detailed, this is a very nice resource for this mod. Thanks
awesome video. thank you. did you notice any mpg improvement ?
I didn’t really notice any.
I'm going to be doing this to my 99 silverado in the spring after the snow is gone and I can get outside and work on it. I noticed your fan relay box there only has contacts for the relays and 3 fuses...did you see that? they make it look like you have room for upgrade but in reality those are just extra "holders" kind of like the "12ga wire"
I did a Hayden dual fan module,With the Radiator Probe the only thing is fans would over heat it and burn up,So the leads to the fans I threw in a 60amp relay to each fan and haven't had any problems.Great video.
Is your setup still working good I want to upgrade to e fans but I don't want to mess with pcm
Probably best video series I have seen on the beloved ole Yukon’s / Tahoe’s
Update? Any measurable difference in mpg and throttle response?
Going to do this to my 04 SS Silverado. Thank you so much for the how to video. Subscribed 🏁
Minute 24:32 grounds?
When the beat dropped at 2:50, I thought that beat from spongebob dancing with the jellyfish was gonna start playing 😂😂😂
I have a stock & beautiful 02' Blazer ZR2 4.3 & it's always ran below 210° down here S of Houston where it gets hot!
Now days it's running around 210° with a 195° thermostat & a tad higher when towing a small 5x9' utility trailer. Like 220° which it's never ran that hot or warm.
I've flushed the radiator, installed a new Severe Duty Clutch Fan (that I only hear on start up) , new coolant after the flush & new 195° thermostat.
I can't hear the new clutch Fan & I have no idea what temp they are supposed to kick on at, I did see somewhere that the Hayden 2786 Fan kicks on around 180° but I don't think so. Maybe I'm freaking out over nothing. It's just always ran around 200° max. (Just left of the 1/2 way mark on gauge) the gauge is good because I can see it when the thermostat opens at 195°. So IDK.
When I did the E fan conversion on my 2002 Tahoe 5.3 I noticed. no difference in horsepower or 0 to 60 times
It varies , back in the 70's removing the clutch fan was one of the most popular " bolt off " mods done , it is called parasitic horsepower drag .....most often replaced with a flex fan , where at high RPM the blades flatten out ......high RPM is where it is most noticed improvement
you wont see much improvement until the clutch locks.
I'm very glad that you made this video. I am ready to do this conversation on two of my vehicles.
Been thinking about doing this
Glad the fans worked out, definitely have to do mine. Took at shot in the dark at the local dealer to see if they could unlock fan control while they were programming my master window switch, no dice. have to check the local tuner to see.
Matt! I love your attitude, your superb mechanics skills and knowledge, the clarity in which you teach others, and the fact so far I've never heard a cuss word so my Grandson who's 8 can watch and learn too. You're helping alot of people Brother, especially me, just bought my 3rd Yukon, only have 1 but have owned others in the past but mine has issues. It's a 2000 YUKON 4X4 5.3 SLT, 328,000 but you would never know, it looks clean and nice. My transmission hits hard in 2nd & 3rd, BUT ONLY after highway speeds, 50 mph & over. Then when I start again from a stop once first gear goes into 2nd, it hits hard, then the next gear, 3rd, then the next gear is a smooth transition. NOW HERES THE THING, ANYONE CAN ANSWER BUT I HOPE MATT DOES TOO. When I get off the highway I pull over at the nearest safe spot, shut the truck off for 2 minutes, start it up, goes through all the gears just fine, AS LONG AS I KEEP IT AT AROUND TOWN SPEEDS, UP TO ABOUT 45 MPH seems to be the sweet spot to keep it shifting correctly. HERE'S MY QUESTION: I I replace ALL the Solenoids located under the trans pan do you think that should fix my issue? I already replaced the shift sensor located on the driver's side of the throttle body. Any help would be greatly appreciated...
Sounds like your transmission needs a maintenance or (hopefully not) a rebuild.
Greets from Germany, I drive a 6" suspension lifted '03 Suburban on 35s.
Shop had to rebuild my 3rd n 4th gear last winter.
@@Rokx80 Sorry to hear you had to rebuild the gears, and thank you for the information. Your truck sounds nice. Mine has a 3in lift but going to a 6 eventually myself too. I'm going to replace the Solenoids in the 4L60-E Transmission first, if that doesn't work off to the tranny shop to spend about $2,500.00 to rebuild it. The truck is worth it, everything is pretty much new already from having to upgrade many parts this last year since I bought it. They're only going to go up in value, especially when the world is getting worse and worse, people are going to want 4x4's and trucks to bug out. My truck is my BUG OUT VEHICLE, it's set up for overlanding. Cheers from Southern Utah U.S.A. Brother. I live in America but I'm Welsh & Scott's Irish.
You should get an Airaid modular intake tube. It will clean up the front of the engine a lot.
Sir I appreciate your time and effort you put into these videos
This is the only way to add an e-fan. Very well done.
Thank you. Im doing a LS Swap for my toyota FJ60. I wont run ac.and your video determined I dont nee HIgh speed. Thanks
What if my 33 pin is already occupied for the ac? I got an 01 Silverado and the pins occupied when I tried to put the e fan pin into the computer
How would you reverse the polarity? I think my fans are pushing instead of pulling air.
I appreciate ya Matt, I have a 99 chev tahoe two door that I'm building now and am incorporating pretty much everything you have on yours, your videos are not boring as shit like most
I love nice cold ac,that V8 screams. Did anyone notice the truck shaking at 37:47 or was it the camera??
I did this too just wired them both to a switch I do wanna upgrade the alternator though cause they pull some power
I did this recently with my 02, pin 33 was still having issues with my Blue/Red ECU connections, had two ECU’s programmed. Couldn’t get it to work, so I just spliced into pin 42 and solved my issue. But love your clean install.
Did your pin 33 have a wire already in it and was your ac compressor coming on ?
@@jimmyramirez8844 honestly I can’t remember but I had to jump the wire for both fans to work. I have a red green connector on my ECU, from what I gathered is you want red blue connectors or an ECU from a red blue.
I have a 2003 Tahoe Z71 Have the fans and I used the Nelson after market harness ! ( was telling my lady I wired the power the way you Finally did it ! Where did you get the download for flashing the computer ! I'm a Jersey transplant in Colorado and now one knows what I'm talking about flashing the computer ! I have all the temps and sure I could do it! (novice) found one place to flash it and they wan't my first born in return ! I'm visiting Jersey in a few weeks and would go to Lakewood to have it done if it's reasonable !
I have a Black Bear Performance tune. They turn the efans on by default with any tune for the GMT800’s imho, it’s probably the best mod you can do for these trucks (BBP tune) it’s a little spendy, but so worth it!
@@heysoos223 Thanks I'm hitting all options! I do have a Flex a Lite controller which I can use temporarily just need a radiator thermostat probe!
Thank you for a very well instruction Efan upgrade. I've got everything to make the conversion except someone with HP tuner to help flash the ECU. Can one be rented?
Looks like a simple ladder diagram. It's good to see a plan come together like this. Gives me hope.
That relay box is nice I got just some cheap relay harness things with pig tails and had one or both melt and I had to re run some but I did find some relay sockets that you crimp the actual connections like yours but just individual which I highly recommend and it just makes things cleaner
I knew the aftermarket harnesses had 3 relays and just assumed it was to run both fans while the A/C was on but now I see you run them in series to get both on a low speed I figured the tune says fan 1 and fan 2 so I figured it didn't matter but I assume that if mine calls for fan 2 it will cut off my fan 1 I don't really test that they both work manually like you did
I just completed this upgrade. I bought an aftermarket harness. When I trigger fan stage 1, it goes to high speed. When I trigger fan stage 2, it goes to low speed. The trigger wires are blue and green. I matched them to the PCM plug of corresponding color per my instructions. I'm figuring the harness is just backwards.
Nice job and a great video! Can't wait to do this to my TBSS.
How would this diagram work on 99-02 pcms???
When I did mine. I did not like the high fans running for the ac at hwy speeds.
Matt i had a tuner set up my computer on my 2001 chevy silverado. It had the wire pined on pin 33 red cover and i took it off as you mentioned. I went ahead and plugged in the new wire from the ac fans relay box from factory. The tuner set it up as 2 fan and analog. With the analog setting the compressor keeps running and doesnt cycle and it freezes up my ac and stops working. Do you have any idea or do you recommend something? Thank love your videos 👍
Did u ever figured out??
@@gerardolopez5875 No I had the tuner put the settings back to analog cycling that the only way the ac doesn't freeze and the compressor cycles how it should. The only downfall is the that fan 1 is always on but it doesn't hurt anything. The cooler the engine runs more horse power. The only way to fix the issue is to change the computer to a 2004 to 2006.
@@macielandsons @ agree, I’ve done 5.3 on 2 of my c10s with 04 harness/pcm, And using 3 pin transducer, its the way to go, Here the only downfall its drive by wire,,, But on my 2001 silverado, Iam just planning the best way to electric fans,
Excellent. Get a tube of automotive electrical silicone grease and put some on each fuse & relay pin when assembling. In fact use it on all the electrical connection points. If the Auto Zone guy looks weird (or tries to sell you tiny light bulb packets of the stuff for way too much money) just find someone who knows what you are asking for. It will prevent corrosion down the road and helps a lot with the cheap Chinese metal used in pins and fuse blades.
One question. Can you tell if they are pulling or pushing air.
Bro you are the Steve Made to car repair. Your videos help me out a 1000 percent
Awesome video dude this how UA-cam videos should be! Very informative, keep up the good work brotha!
What music are you using at 18:23 song & artist?. I’m really digging the video and music.
Which one is fan 1 and which one is fan 2
Are both supposed to come on low and high once up to set temp, or is one fan low and one fan for high
Just installed a set of electric fans on my 03 gmc yukon denali. I just have one question at what temperature are they supposed to turn on. My temperature goes past the 210 for sure with my old clutch fan temperature was below 210. I feel like is gunna overheat never seen it go more than 210 is this normal?
If you have HPTuners, just copy the settings from a vehicle that came with them from the factory (like an '06 Tahoe or whatever). 210 is normal though, should stay at that temp and really never go over unless you're towing something heavy.
Been waiting for this one! Good stuff
I have a 2004 z71 tahoe...Would i need to flash the computer if i got the factory harness????
Amazon has a harness made specifically for the conversion for $70. I did the conversion on my silverado and got the computer tuned to turn them on. It works perfectly. No need for Nelson performance
Do you know the part number? I would appreciate the info
Part # bro much appreciated
Ok video but you confused the hell out of me with the hp tune ac recirqe 02 and down. Cut the wire? Like if you made the harness vs using the factory harness? Do I put it on fan2 using the factory harness or your only changing that for the home made harness?
This is the best video I haved seen about E fan on chevy's
My 03 Yukon Denali is doing the same thing, you can hear that "big diesel rig" whine when it accelerates, and the AC blows warm at idle. Also it seems the recirculate switch isn't actually closing it off.......thoughts?
thanks for this video I been wanting to do this on my 4.8 sierra for the same issue!
You should check your refrigerant level. My trailblazer i run two electric fans from a 2002 camaro. With both fans on with low refrigerant was cold but not super. Then once I was able to determine my shrader was leaking it was cold even with no fans on at all.
Know a guy who did the e fan swap. One fan failed to come on when set to thru the ecm, overheated the transmission.
Another great mod! I am not great at wiring & prefer to use the factory harness. Any posdibility you could go over the necessary steps to installing the factory harness?
Thanks for sharing all your mods!
Could I do everything you’re doing to this Tahoe to my 04 Yukon xl RWD?
Thanks for the video. I’m looking to do this upgrade on my 2003 Sierra 1500. I have already picked up a larger radiator and will hopefully get the fan assembly and factory harness in a few weeks. My question is about the computer tuning to tell the fans to turn on. Will this work on my 2003? And if I can’t find a local shop to do it do you know any mechanics I could send the ecm to tune it?
Please post up an update. Want to know if you've ran into other issues, like wires melting or alternator is not pull amperage, battery is drain out?
I have a 01 GMC that has pin 33 taken installed new ac system all relays and fuses are good do I need to tell my tuner to switch to analog?
Who did your tuning for the efans I have my efans on but the tune isn’t working right it drops the volts with the ac on when I come to a stop. Already have a new 130amp alternator
I have an 03 yukon denali with the factory clutch fan, do you think it’s worth it swap to the e fans? How difficult would you rate this install? I’m scared of messing something up especially with the wiring.
You can buy a kit that makes it plug and play, definitely worth it, just for the space it frees up under the hood alone. Your AC will work better because the fans move more air at idle than the clutch fan can. Did this on my '01 Suburban, still need to do it on my '03.
@@GrandPrix46 Does the ecu need to be programmed to tell the fans to come on when the ac compressor is on?
@@audimanao yes, I used my HPTuners and just copied the settings from an '06 Suburban that had them from the factory.
Hey mate any aftermarket wiring harness or kit you would recommend for us not so Electronically inclined, love the video by the way !
Hey did the e-fans end up saving fuel?
are you going to upgrade the alternator now? I had to get a high output alt on my tahoe when i did the efans
Matt you should put fuseable links where your 12v+ tie into you main fuse block lug. Otherwise you have those 2-3 feet of wire un fused. Not a huge risk but for me worth doing.
I've never done the "tune" when doing the "E-fan" conversion, I use the factory fans with a "Stand-alone" controller from Flex-A-Lite. Been doing this since 2007, with absolutely 0% negative effects. The Flex-A-Lite controller has a temperature control range from 160°-210°. I always set it to around 170°-180° & it fires the fans up like clockwork.
Seems like a fan switch and relay would suffice you can always use two inputs on the relay for a/c purposes
The point is keeping it oem style
Buying credits solely for the purpose of triggering some fans seems a bit extra, I'll do it on mine at some point but only because it's already unlocked. We've all got different priorities when it comes to budgeting i suppose.
You need to upgrade alternator. Phoenix last summer at idle ran my voltmeter to like 9-10. I did those fans on my 2000 Escalade. It really did clean up the engine bay. I now have a 2004 Escalade ext that surprisingly came without electric fans. I’m going to do this to this one now but like I said I also need to upgrade alternator to a 300 amp one or higher. Those fans have a huge current draw.
Electric fans started in '05 for these.
Hey matt i just did the e-fan upgrade on my 01 sierra. I put the settings to analog like u said in the video and a few other videos sUd the same thing you did but my a/c lines are freezing up. Someone said i need to set it to serial cycling instead. Any input on this?
did you ever figure this out??
Im having the same issue. @LsxMatt could you let us know??
@@charlesp7574 yes i did.
@@charlesp7574 i talked woth a fre guys and they told me to pit the settings to analog cycling and i havent had it freeze up cince. I did re adjust my fan perimeter as well but only because i changed my thermostat size from a 160 to a 187.
I want to do this for my 03 H2 Hummer. same motor and what not so I dont see why it wont work
So I did my efan swap. Pinned both wires to the PCM that was reprogrammed as needed. Did all of this with a harness removed from a known good 2005 Silverado.
Now I'm stuck chasing a problem I haven't seen in watching at least a dozen videos about this swap.... my relays are going nuts. I haven't done any wire chasing, mostly because I don't know where to start. It's not like there is room for any level of mistake. If the fans are plugged in backward then the wrong fan comes on. If the PCM pins are wired backward then, again, the wrong fan would come on. What it sounds like is that the PCM is pushing a PWN signal to the fans. All 3 relays are clicking away at about 15 Hz, but slightly offset. WTH is going on?
I have an 04 Silverado and want to do this swap. Would I have to use the factory PCM and tune it to run the fans, or I could I use the PCM out of the donor truck. I know GM has different “color coded” PCMs. Like yours is green and blue.
When you was dropping the fans what was that squeaky sound my truck make that same noise
Sir, I have a 2001 gmc Sierra SLT 1500 5.3 I’m wanting to convert the glutch fan to e fans I live in El Paso texas where can I go to have this done, I mean what kind of shop would I be looking for, I’ve heard that the wording harmed and Altima tot had to be up graded, nit sure how true that is, thank and I’m now following you as to your intelligence to you how to do.
Yet another fantastic video! Super Appreciated 😀 👍I can't wait to do the swap once I get all the needed goodies. Question on the Tune what were they able to add over the stock Tune? As I just purchased an 03 Z71 and looking to add as much as possible without replacing headstones, cams etc for Now. Thanks Eddie J. Long Island N.Y
You can change it however you want. With HP tuners you can tune everything yourself. Or you can data log and find a good tuner to do it. These engines really wake up with a good tune. I’ve watched quite a few tuning videos trying to learn on HP tuners and you would be amazed by how much GM dumbed down the factory tune. I guess it was to please the epa.
Im about to do this mod on my 04 avalanche. I have the fans and harness. Would it be worth buying hp tuners and doing it myself and did hp tuners cost?
This is a great video btw. If I was this video before I bought harness I definitely would be wiring up fans they way you did yours.