I used a ball valve from hardware store because I was working out in the middle of nowhere and the only thing around was a hardware store I cut into the water pump hose and installed a ball valve with 2 barbed female male brass fittings along with hose clamps. It's been on there 3 yrs. With no problems, when winter gets here I just raise the hood and turn valve back on,I also leave it barely flowing just to keep coolant flowing through heater core. My AC is so cold in my 04 6.0 PowerStroke that I can't leave it on full blast on a 100°degree day or it will cause a brain and face freeze!!
Great tutorial. I think I’ve been subscribed for quite a long time. This problem has been bugging me for a few years. This along with the clutch air gap fix. Straight forward descriptions. Thanks ! 2002 7.3.
@@TruckStuff1 First off THANK YOU... How has this held up? Is there anything you would have done differently... Apparently 4th Gen Ford E350 vans have the same AC/Heater Core Issue.. This tutorial was accurately explained... The F style vacuum connector was genius...
There is an empty rubber stopper through the bulkhead right next to the under dash vacuum tube that was way easier to get through than next to the heater hoses and don't have to reach up behind the dash. It is behind the passenger wheel well plastic though. Other than that everything else is the same.
The issues you are having wont make a difference. If you have a diesel you will need a new vacuum pump and if you have a gaser you have a vacuum leak somewhere or your vacuum actuator is messed up
Trey how much cooling difference before and after? This will work on most auto's as the coolant is running through the heater core which is inside the car behind the glove box , So great Idea Trey to stop the passive heat transfer.
Thats great mod, when ever u can remove any extra heat from under dash 10 to 22 degrees makes a big difference, a more simple solution is a u pipe does samething ,wont needed till winter
Trey, I'd be interested in doing this mod, if it makes that much difference. But wouldn't the temperature control, turning all the way to the coolest setting, already do this? Thanks!
My white line will not seal properly on my T fitting which is the same brand as yours but white and looks different. I need that exact black f fitting, where did you buy it?
Hi Terry, how is this mod holding up? Any issue with the yg-350 valve not shutting off all the way, or issue with vacuum line melting bc of the close proximity to heater hose? Thanks! Ryan
Hi Trey...I'd like to do the mod back can't see some of the tubing and connector dimensions. Can you post them in the notes? Some of the Vacu-tite p/n's are not current. Thanks.
most ppl won't need to install the vacuum hose, it will be a small grey hose plugged into the hvac box inside the engine compartment, right next to the accumulator.
@@everteran783 the grey hose goes to a heater hose bypass valve if you don't have one it gets plugged into the box on the side of the evaporator housing, its only a plug, you just pull it off and put it on the bypass if you are adding one.
@@jmr5x I don't know, they've been using them forever but idk if the color of hose was the same for all. Also depends on options, if its automatic hvac there may not be any vacuum lines going to the hvac box at all
Every now and then my ac will cut out and pure heat will come out and its intermitant Any ideals as to why, Im going to do this mod as soon as i can on my 06 6.0 f350 dually
Trey, is it possible to pin the arm on the valve shut (with wire or something) so u don't have to hook up the vacuum line at all? Then it would be super cold on both ac settings. I'm about to buy one.
Does it matter if you put the hose from the water pump on the right or left inlet? Reason I ask is when I switch from max the valve doesn't revert to flow into heater core. I have verified with vacuum gauge that vacuum goes from 14 to 0 when switch is not on max.
I am gathering all of the parts to do this mod on my '99 F-250. Did you have to burp the coolant system since you introduced air when you cut the lines?
so, I guess I have the factory bypass, but it doesn't look like the one you installed. only has one tube with valve in middle. do I need something else?
cloudisunset - it's the same vacuum signal that closes the fresh-air door to recirculate air in the cab. Whenever you put the selector knob to Max A/C it closes the fresh-air door and actuates the bypass valve at the same time.
George McGavern ahh, I want to have that thing shut most of the time. Maybe I can add a switch. Don't like the exhaust smell making it back into the cab.
I ride around in Max A/C most of the time. In that mode, the heater core is bypassed. Occasionally when I'm not in traffic I switch over to norm just to make sure fresh fluid is flushed through the core. I don't know if it's that critical, I just feel like it's a good thing to do. Later trucks have this mod standard.
George McGavern+ I have a 2004 f350 that when the Max A/C is on it will stop blowing out of the vents and start blowing out from the defrost vent. Is this normal because it seems cooler when I run it on just A/C.
No. Sounds like you have an issue in your vacuum system. Could possibly be the line controlling the outside air door is off or broken causing the system vacuum to reduce, or it has been mis-plumbed. Vacuum controls the dampers that direct air to the vents, defrost, floor, etc. and it also controls the dampers that direct air from outside or recirculate it, and how much air passes over the heater core.
yea that helps, now i am going to add a larger 134 condensor that has smaller slower flow tubes to cool the freon longer new compressor and use R12 freon with mirror tint should help out livin in Hellabama heat wave humid hell Oh in a simple 1980 datsun
Does anyone know what the torque specs are for the bolt on the anti way bar bushing and end link to swaybar.. End link to body frame. I have a 2003 f350 7.3l
Jeez...did you ever find that spec? Are you replacing the bolt because the bracket (welded) ripped loose from the axle? Thanks ford for all the weak points on my excursion.
@@TruckStuff1 What is the problem with leaving it on maxac? I usually run on MAXAC all the time so I do not smell the exhaust of the cars around me on the freeway.
Keeps the heat from the core from warming the air before it blows over the a/c evaporator. pretty much anytime the climate controls are "on" (heat or air), this valve is open, allowing water to flow. this is why if you select hot air on the blend even with the a/c on, you get full 150' air coming out cause there is water going thru. I think the tee he put in would seem to only apply vaccum to the valve and open when the heater only is on (floor or defrost). But the overall (and valid) theory is to keep all the extra heat out of the heater & a/c box. I did this in my Dodge van several years ago and my a/c got at least 15 degrees cooler, except instead of a stock valve I used two brass plumbing ball valves and capped the vaccum hose. I just open the hood and turn them on when it gets cold out.
+Trey Spooner Hey Mr. Spooner, thanks for the video! I have an '02 F-250 7.3 Diesel. If I put this on like you have shown; will the A/C be on max cool all the time? Will I need to undo this in winter to heat to work? Thanks again!
+Trey Spooner Ok, thank you so very much Mr. Spooner! I will be buying parts tomorrow and doing some work. Thank you for sharing your knowledge in such an easy to understand way and method!!!
Trey, thank you for this video. I did the mod and measured about a 10°F difference with no a/c (system was down for maintenance). Posted the results on this video: ua-cam.com/video/KQ57nIQ05ug/v-deo.html
Lol only people who really like their vehicles go the extra mile and clean the engine and the bay as well, just pressure washed mine before changing a fuel line
I would beware of this fix. It helps now, but if that plastic brakes, which it will do with time and age, will cause a loss of coolant. A loss of coolant will cause a blown head gasket.
The OEM part was plastic. Mines original from 2003 and it hasn't blown up yet. Better ditch your radiator too cause the tanks are plastic. Also your fuel tank is plastic. OH NO
I KNOW FOR A FACT THAT ALL FORD TRUCKS SINCE 1998 CAME NEW WITH A VALVE THAT - WHEN SUPPLIED WITH FULL VACUUM - CUT OFF THE WATER FLOW TO THE HEATER CORE.
@@TruckStuff1 You might be right but my Ford Service Manuals on DVD for '98, '99, '02 through '06 show all V8 F250s and V10 F350s and F450s do. But what do they know...
@@TruckStuff1 Where'd you learn to reason backwards from "things a lot of people do" ? Want me to start naming popular mods going back to the 50's that were absolutely worthless ? Newest trucks I got manuals for is 2012, 2013. You might be partially right, yet, though - I may have spoke too soon about "ALL".
I'm just saying I don't believe it is a factory option because it's such a popular mod. If it was standard from the factory most people wouldn't need to do the modification.
Gabriel Fonseca if your car blew up from just looping the heater hoses together then your an idiot and you did something wrong been doing this for years on many different rides and it's impossible for this to cause an engine failure
5:50 = Superior honesty! Bro, you're awesome.
Doing my best!
I used a ball valve from hardware store because I was working out in the middle of nowhere and the only thing around was a hardware store I cut into the water pump hose and installed a ball valve with 2 barbed female male brass fittings along with hose clamps. It's been on there 3 yrs. With no problems, when winter gets here I just raise the hood and turn valve back on,I also leave it barely flowing just to keep coolant flowing through heater core. My AC is so cold in my 04 6.0 PowerStroke that I can't leave it on full blast on a 100°degree day or it will cause a brain and face freeze!!
Excellent idea!
Excellent idea!
Do you know the exact diameter of the hose off hand?
@@TheRitewing1 I think it's 3/4"
Great tutorial. I think I’ve been subscribed for quite a long time. This problem has been bugging me for a few years. This along with the clutch air gap fix. Straight forward descriptions. Thanks ! 2002 7.3.
Glad to help! Thank you!
@@TruckStuff1 First off THANK YOU...
How has this held up? Is there anything you would have done differently...
Apparently 4th Gen Ford E350 vans have the same AC/Heater Core Issue..
This tutorial was accurately explained... The F style vacuum connector was genius...
There is an empty rubber stopper through the bulkhead right next to the under dash vacuum tube that was way easier to get through than next to the heater hoses and don't have to reach up behind the dash. It is behind the passenger wheel well plastic though. Other than that everything else is the same.
I’m going to try this step I’m having trouble with my air conditioner blowing out of my defrost instead of my vents! My names Trey too:)
Did it work for you? I’m having the same issue and I can’t figure it out for the life of me
@@TwstedNimbus the 4wd actuator next to the little vacuum pump was bad, that was the culprit
The issues you are having wont make a difference. If you have a diesel you will need a new vacuum pump and if you have a gaser you have a vacuum leak somewhere or your vacuum actuator is messed up
Trey how much cooling difference before and after?
This will work on most auto's as the coolant is running through the heater core which is inside the car behind the glove box ,
So great Idea Trey to stop the passive heat transfer.
Thats great mod, when ever u can remove any extra heat from under dash 10 to 22 degrees makes a big difference, a more simple solution is a u pipe does samething ,wont needed till winter
Trey, I'd be interested in doing this mod, if it makes that much difference. But wouldn't the temperature control, turning all the way to the coolest setting, already do this? Thanks!
My white line will not seal properly on my T fitting which is the same brand as yours but white and looks different. I need that exact black f fitting, where did you buy it?
I hit the 1000th like!! Thanks for this man
That's awesome! Thank you!!
I have a 05 Excursion and it has the single line cut off valve, can i replace it with that valve and use the existing vacuum line for it to work, tks
Hi Terry, how is this mod holding up? Any issue with the yg-350 valve not shutting off all the way, or issue with vacuum line melting bc of the close proximity to heater hose? Thanks! Ryan
What were your before and after temps on your ac?
thx i ll disconnect the heater core since ill never use it in my area
How does this mod make the ac blow colder? Is it by keeping the hot coolant out of the cab?
Essentially, yes. The heater core always has coolant and air blowing across it. This mod blocks coolant from circulating through the heater core.
Is there a different vacuum source so this will work in other settings also? So the vent will actually be outside air temp
Do the ball valve instead like the other viewer commented it will stay off until you open valve
Hi Trey...I'd like to do the mod back can't see some of the tubing and connector dimensions. Can you post them in the notes? Some of the Vacu-tite p/n's are not current. Thanks.
Thanks You Show How It Works Thanks You Made a Good Video Trey Spooner !!
most ppl won't need to install the vacuum hose, it will be a small grey hose plugged into the hvac box inside the engine compartment, right next to the accumulator.
Good to know....looking for the HVAC box in the morning.
U still need a T or a F right?
@@everteran783 the grey hose goes to a heater hose bypass valve if you don't have one it gets plugged into the box on the side of the evaporator housing, its only a plug, you just pull it off and put it on the bypass if you are adding one.
@@miket6978 Do you know what year they started putting the grey hose on?
@@jmr5x I don't know, they've been using them forever but idk if the color of hose was the same for all. Also depends on options, if its automatic hvac there may not be any vacuum lines going to the hvac box at all
what size vac line?
@trey spooner for what motors does this work on ?
This really make your ac colder
Every now and then my ac will cut out and pure heat will come out and its intermitant
Any ideals as to why,
Im going to do this mod as soon as i can on my 06 6.0 f350 dually
Could be a heater core valve.
What size vacuum line did you use?
Does this same bypass valve work for the 6.0? My factory hoses look much larger
Same basic idea, yes
The hoses that feed the valve how do they connect. Which is water pump and which goes to engine block or intake???
Spring clamps.
Trey, is it possible to pin the arm on the valve shut (with wire or something) so u don't have to hook up the vacuum line at all?
Then it would be super cold on both ac settings. I'm about to buy one.
Trey Spooner Thanks man!
Yes I have mine closed all year round they just doing it the fancy way
Yes I did mine that way
tough crowd
Does it matter if you put the hose from the water pump on the right or left inlet?
Reason I ask is when I switch from max the valve doesn't revert to flow into heater core.
I have verified with vacuum gauge that vacuum goes from 14 to 0 when switch is not on max.
I'm not positive. I wouldn't think so, but it's possible there's a check valve somewhere.
I think you said you put the hose from the water pump on the outside. If that is correct I will switch to see if that makes a difference.
Let me know what you find
Have you noticed a difference with the valve installed? Thank you for your videos, they take some of the confusion out of modding these trucks.
I just got the one from RiffRaff and it is incredible what difference this little valve makes. Thank you for everything and have a great day!
I am gathering all of the parts to do this mod on my '99 F-250. Did you have to burp the coolant system since you introduced air when you cut the lines?
No it will work it's way out on its own.
What makes the valve activate and close.
Vacuum applied by switching the HVAC to Max AC
so, I guess I have the factory bypass, but it doesn't look like the one you installed. only has one tube with valve in middle. do I need something else?
It's amazing how people don't pay attention. One of the first things he says is the factory one is one tube ...
@@Nitr0EngiEx he also said he’d explain why he didn’t like that valve but didn’t. Sit down.
Trey, what actuates the vacuum? Is there an on/off switch?
cloudisunset - it's the same vacuum signal that closes the fresh-air door to recirculate air in the cab. Whenever you put the selector knob to Max A/C it closes the fresh-air door and actuates the bypass valve at the same time.
George McGavern ahh, I want to have that thing shut most of the time. Maybe I can add a switch. Don't like the exhaust smell making it back into the cab.
I ride around in Max A/C most of the time. In that mode, the heater core is bypassed. Occasionally when I'm not in traffic I switch over to norm just to make sure fresh fluid is flushed through the core. I don't know if it's that critical, I just feel like it's a good thing to do. Later trucks have this mod standard.
George McGavern+ I have a 2004 f350 that when the Max A/C is on it will stop blowing out of the vents and start blowing out from the defrost vent. Is this normal because it seems cooler when I run it on just A/C.
No. Sounds like you have an issue in your vacuum system. Could possibly be the line controlling the outside air door is off or broken causing the system vacuum to reduce, or it has been mis-plumbed. Vacuum controls the dampers that direct air to the vents, defrost, floor, etc. and it also controls the dampers that direct air from outside or recirculate it, and how much air passes over the heater core.
Would this be the same on a 95 7.3?
Have you tried it
my heater does not but don't need it live in buckeye az can I still this modified?
It gets a little chilly here sometimes!
yea that helps, now i am going to add a larger 134 condensor that has smaller slower flow tubes to cool the freon longer new compressor and use R12 freon with mirror tint should help out livin in Hellabama heat wave humid hell Oh in a simple 1980 datsun
How that work
I’d like my AC to stay on max/recirc when on panel and floor. Anyone done this?
I know this if from three years ago but if you haven’t found a fix yet dieselsite makes a lot that lets you do this for all settings
@@xthexadvantagex I figured it out. I put a tee in the vacuum supply line and ran it to the max AC recirc valve actuator so it’s always closed IIRC
good vid, thanks man
Need to turn up the volume
Does anyone know what the torque specs are for the bolt on the anti way bar bushing and end link to swaybar.. End link to body frame. I have a 2003 f350 7.3l
Jeez...did you ever find that spec? Are you replacing the bolt because the bracket (welded) ripped loose from the axle? Thanks ford for all the weak points on my excursion.
What or how does this change the ac? Cooler? Blow harder?
It makes it colder. It blocks the coolant from reaching the heater core.
Truck Stuff Does it make a pretty big difference? Does it hurt anything?
It doesn't hurt anything at all, as long as you don't leave it in MAX AC all the time. It makes a difference but I can't tell you how much
@@TruckStuff1 What is the problem with leaving it on maxac? I usually run on MAXAC all the time so I do not smell the exhaust of the cars around me on the freeway.
@@TruckStuff1 yes I would also like to know why we cant leave it on Max a/c all the time?? What does it hurt????
After troubleshooting, I found that my hotdog 🌭 was countering the a/c system.
Does this really make your AC colder
Yep! Several degrees in the summer
LMMFAO!!!!@ 3:30
By doing this Mod You bypass the Heater Core. How does this make the AC Colder?
Keeps the heat from the core from warming the air before it blows over the a/c evaporator. pretty much anytime the climate controls are "on" (heat or air), this valve is open, allowing water to flow. this is why if you select hot air on the blend even with the a/c on, you get full 150' air coming out cause there is water going thru. I think the tee he put in would seem to only apply vaccum to the valve and open when the heater only is on (floor or defrost).
But the overall (and valid) theory is to keep all the extra heat out of the heater & a/c box. I did this in my Dodge van several years ago and my a/c got at least 15 degrees cooler, except instead of a stock valve I used two brass plumbing ball valves and capped the vaccum hose. I just open the hood and turn them on when it gets cold out.
***** Doesn't the blender door already bypass the heater core when you switch the unit to Max AC? Isn't that what the valve under the dash is doing?
+Trey Spooner
Hey Mr. Spooner, thanks for the video! I have an '02 F-250 7.3 Diesel. If I put this on like you have shown; will the A/C be on max cool all the time? Will I need to undo this in winter to heat to work? Thanks again!
+Trey Spooner
Ok, thank you so very much Mr. Spooner! I will be buying parts tomorrow and doing some work. Thank you for sharing your knowledge in such an easy to understand way and method!!!
+Nick Kafir wayy old, but i think max ac only circulates the inside air..
Gm uses that setup and it is a known failures point. No thanks.
Trey, thank you for this video. I did the mod and measured about a 10°F difference with no a/c (system was down for maintenance). Posted the results on this video: ua-cam.com/video/KQ57nIQ05ug/v-deo.html
will this work on a 6.0 f250 powerstoke
Andrew Catron I bought my 2006 6.0 used and it has one. I assumed it was OEM
Damn dude you could have washed your engine bay
Most people don't give a shit about that. It's not your truck why do you care
Lol only people who really like their vehicles go the extra mile and clean the engine and the bay as well, just pressure washed mine before changing a fuel line
THE FUCKING VOLUME JESUS
I would beware of this fix. It helps now, but if that plastic brakes, which it will do with time and age, will cause a loss of coolant. A loss of coolant will cause a blown head gasket.
"and anger.. leads to suffering..." - Yoda
Good thing my 20 year old plastic piece is still working strong but the rear end gave out and locked up
Wait...almost all heater valves for the last several decades have been plastic. I think UA-cam needs no more fear-mongering.
mikes time stock ford valves are all plastic!! might want to think about your comment!!
The OEM part was plastic. Mines original from 2003 and it hasn't blown up yet. Better ditch your radiator too cause the tanks are plastic. Also your fuel tank is plastic. OH NO
Huh what can't hear ya
I KNOW FOR A FACT THAT ALL FORD TRUCKS SINCE 1998 CAME NEW WITH A VALVE THAT - WHEN SUPPLIED WITH FULL VACUUM - CUT OFF THE WATER FLOW TO THE HEATER CORE.
Not correct. Most Superduties don't have them. Excursions and Rangers for some reason got them.
@@TruckStuff1 You might be right but my Ford Service Manuals on DVD for '98, '99, '02 through '06 show all V8 F250s and V10 F350s and F450s do.
But what do they know...
It wouldn't be a popular mod if they all had it from the factory 🤷
@@TruckStuff1 Where'd you learn to reason backwards from "things a lot of people do" ? Want me to start naming popular mods going back to the 50's that were absolutely worthless ? Newest trucks I got manuals for is 2012, 2013.
You might be partially right, yet, though - I may have spoke too soon about "ALL".
I'm just saying I don't believe it is a factory option because it's such a popular mod. If it was standard from the factory most people wouldn't need to do the modification.
IF YOU SPLICE YOUR HIGH PRESSURE AND LOWER PRESSURE A/C LINES TOGETHER THE CLUTH WILL ALWAY STAY ENGAGED AND GET FREEZING COLD
What ?
You realize that will cause the condenser to freeze over, right? There is a reason the AC compressor cycles on and off.
You gotta get closer to the camera or get a microphone Bubb.
why not show how it works after the mod?
Check at 6:19 into the video.
you goning to have to talk louder son! or bring the Mic in closer
Sorry this video was a long time ago when I was only using a cell phone
How about turning your hearing aid on grandpa or cleaning your ears more than once a decade.
I tried that and my car blew up
Gabriel Fonseca if your car blew up from just looping the heater hoses together then your an idiot and you did something wrong been doing this for years on many different rides and it's impossible for this to cause an engine failure
That's literally not possible in this application. The only possible way is if your dumbass dumped all the coolant and didnt fill it.
Hose clamps not heat we r hoselol
Sad that you talk so low or the camera can't pick up your voice. Stopped watching 1 minute in.
You cannot turn up the volume? Besides...the volume increases at 90 seconds or so.
What size vacuum line??
What size ac hose?