I had the same problem. Replaced coolant sensor, thermostat and finally the ambient air temperature sensor behind the front grill. Only $7. Fixed the fans staying on no a/c and flat line temp gauge issues
You replace the sensor to fix the temp gauge in the cluster or if you have a CEL code. I dont know why you replace ambient temp sensor, it has nothing to do with the radiator fan.
After replacing the sensor it was not an immediate fix. After some driving 2 miles or so, it did fix the issue, I figured maybe computer and it needed to take time?
On these type of trucks the thermostat will go bad and then it causes the temp sensor to go bad. That is why the fans kick on as soon as you start the car. If it were just the thermostat (even if stuck open) the high fan would not cone on. The high fan is controlled by the thermostat temp sensor. If the sensor is working right and the thermostat is stuck open the high fan won't come on until the engine begins to overheat. When you are driving in cold weather your engine may never get hot enough to engage the high fans because all of that cold air passing through the fins of the radiator. Throwing parts at a car instead of taking the necessary time to accurately diagnose the problem can and likely will cost you more money and aggravation than doing it the right way.
If you let the engine cool down you can then remove any pressure that's left over by removing either the radiator cap or the coolant system reservoir cap whichever application your vehicle has. When you get a burnt light was on that video you run the risk of contaminating electrical connectors and or causing a short on other electrical items.
Accept he was wrong. The problem was both the thermostat and the temp sensor. Thermostat went bad which cause the engine to overheat one too many times period as a result the temperature thermostat sensor went bad thereby causing the high fan to always take on as soon as you turn the car on. If it were just a thermostat the high man would not turn on until the engine got too hot. It is the temperature sensor that controls that high fan. FWIW, yes the temp sensor wiring harness is connected to AC compressor and defroster. That's WHY THE HIGH fan kicks on when you turn on the defrost or a/c.
Thanks for the video. I have a similar problem but I also have a Check Engine Light too. Could these be related also does it have anything to do with cold weather?
If you replace the fan sensor or the sensor by the Thermostat housing. Unhook your positive cable on your battery. It will reset everything. I didn’t have to replace the thermostat. Went up to right temperature fan stayed off. Turned off truck fan stayed off too. Took the truck for a drive, no overheating issues either.
happened to me last night and it didnt work until i cleared the code then it worked, i cleared the code by disconnetcing the battery for a few minutes and that work.
What if you replaced the bad sensor, the fan no longer blew hard, the gauge went past 160,you drove it for a month with no problems, but suddenly it started again? What could be the issue?
If the fan stays on when car is off, its a bad thermostat. Replace it and clear check engine light. This fan has 2 speeds, low speed and high speed. Low speed on idle and high speed when the car hit temp or with ac on. Either mode doesnt work, check the fan relay, replace the fan if needed. If the coolant temp gauge doesnt work properly, replace the coolant temp sensor with oem sensor. If you replace it with oem sensor and still have same problem, either computer is bad or cluster is bad (wiring issue).
On the side note, it could always be your temperature sensor, are your thermostat, in my case, I didn't replace either and I did not disconnect the battery but I brought the coolant to the proper level, put her in reverse and slammed on the gas, next thing you know. Back on the road, thermostat was probably stuck closed.
P0128. New thermostat. Buy gm or equivalent. Do not purchase Amazon junk. Clear codes or disconnect battery. Ct sensors generally only break if you beat them with a hammer.
I had same problem, changed temperature sensor an thermostat, fan still kept running, no check engine light on. Disconnected battery and started temperature hand moved up an fan didn't come on. Disconnecting battery was the trick.
I had the same problem. After watching the video I checked the temp sensor with a meter and found it to be open. Replaced the sensor but problem still existed. I did not have a check engine light, but I checked the codes and I did have the PO 128. As soon as I cleared the codes the fans immediately stopped.I rechecked the sensor after replacement, and it’s checking good now? It must be intermittent. Working fine now
i have a 2015 silverado with the V6 and i'm driving the other day and glance down at the temp gauge and the thing is pegged all the way to hot so i kinda freaked and had a mile to go so when i got home i popped the hood and nothing seemed wrong or over heated but the fans were not running and i had no idea the thing had electric fans i thought it ran off a belt like the old days, that's how out of touch i am with cars. so i let the thing cool off for a few hours and ran it again at idle for 30 minutes and nothing happened with the temp gauge, no check engine light and no message on the dic however the fans would only come on for 30 seconds and then shut off , the outside air temp was 30F. i brought the truck to the local garage whom i trust and they found nothing wrong and to keep an eye on it but i hope the thing doesn't leave me flat some day.
Fans run and turn off and run is normal. As long as the engine not smoking then its not overheating. The problem could be coolant temp sensor could be going bad. If it happen again, change the sensor first.
ok, so i couldn't get the condition to happen again and when they were checking it out at the garage the same the guys there did not want to replace parts w/o the proof it's bad. i would have done it all myself and still have the tools but i'm in my 70's and i've gotten away from it. thnx for the info. @@Ah_Duuu_Ma
A fan pulls the atmospheric air in that's why in the heat of summer, in traffic jams you will see cars overheating. You have to have atmospheric air for the motor to turn. Air, water, and fuel.
Check if the thermostat connector, make sure the wires are good no damage (check for power and ground, if you know how). Check for any leak if coolant is not enough, both upper and lower hoses are evenly hot, thats mean the thermostat is opening. If the coolant system is not completely bleed, air still trap in the system. Maybe radiator could be clogged. "Key On Engine Off" pull the fans fuses for it to reset, and clear the code before restarting engine (even if theres no code showing).
So, just when I thought the problem disappeared. I reset the code. for a minute, my fan didn't go on, which sounded good now. I have code P0532. What should I be looking for?
P0532 - a/c low refrigerant, means low on freon (a/c won't be as cold). Check the a/c lines and valves for leak. Check a/c compressor for leak (green color dye with special neon light). If everything is good, go recharge the a/c system.
Yes it is still ok to drive but as long as theres no coolant leak, make sure the gauge doesnt reach up to HOT, and make sure the fan doesnt stay on when you turn off the car.
Why does no one show how to remove the connection? Tugging on it will not work, is there a pressure point or maneuvering that can be shown or explained?
Yes its bad. If the radiator fans stay all time, it could drain the battery, burn out the fan when its too hot, the temp gauge could be going up to overheat. Fix the problem, clear the check engine light before you drive.
What of the cel is not on but the gauge was not ready and the fans were staying on?? I changed the thermostat, thermostat sensor. But the gauge still isn't working and the fans are staying on after I turn off the truck. Should I disconnect the battery? It might reset?
@@edwindelrio1254 If you replace both parts with oem already, then clear the cel before starting again. Fans running, could be the coolant system is not completely bleed air out. Could be clog somewhere in the coolant system thats not allowing coolant to circulate. Not enough coolant. Thermostat is not opening. The gauge is not working, coud be defected thermostat sensor not reading right. No power and ground going into the sensor (check for broken wires or damge connector). You must replace the parts with oem, aftermarket parts could be defecteive and pull the fans fuses out to see if it reset itself.
Do you have to clear the code after you replace the thermostat? I’m having this exact issue, replaced the thermostat but it’s still having the same issues.
@Mike CAMPOY Check the fuse, make sure its not blown. Check the fan connector, make sure its not burnt or damage wires. Check for power and ground at the cooling fan connector (if you know how). Replace the thermostat with OEM part.
Because you replaced the wrong part. Replace there thermostat and coolant temp sensor, clear the check engine light (even if there's no light on), this will save the problem.
Disconnecting battery doesn't solve the problem, it turn off the check engine light for now. The problem is still there, will come back sooner or later because you didn't fix the problem. The check engine light code will be save as memory code. You can disconnect the battery if you have fixed the problem.
If you get a scanner and erase the codes your fans will start working fine and your temperature will read but that’s not the fix cause it will do it again if you drive it for an hr or so
i have to stop watching these videos on youtube all of a sudden i think i can fix anything...lol most of the time i end up doing it but i should stay in my lane ill leave my issue to a mechanic im pretty sure its a scensor issue for me but whatever.
My mechanic change the sensor twice already and my fan still has the same problem. When I start it it's fine but while I'm driving the temperature meter will just drop and my fan turns on immediately. What can the issue be?what do suggest to do?
Make sure you buy the oem part, dont buy aftermarket sometime dont work. Replace ect sensor and thermsotat oem first. Make sure you clear the code right after replacing the parts.
@LackLusterMedia Changing the ECT censor won't do the work itself, change it twice, and it didn't fix the problem. You have to replace the thermostat and clear the code. Make sure to use the OEM part. There are inexpensive
Check the both fans fuses and wires for broken / damaged and check the connectors for loose connection, pins damaged or corrosion (poor connection). Check if there's power at the connectors (if you know how) or the fan itself is bad. Try to pull the fuses to see if the fans reset itself.
Disconnect the battery and re connect it. That's the trick. It worked for me
I had the same problem. Replaced coolant sensor, thermostat and finally the ambient air temperature sensor behind the front grill. Only $7. Fixed the fans staying on no a/c and flat line temp gauge issues
You replace the sensor to fix the temp gauge in the cluster or if you have a CEL code. I dont know why you replace ambient temp sensor, it has nothing to do with the radiator fan.
Thanks man. I just caught Chevy trying to lie to me saying I needed new fans. Turns out they un plugged my lo fan bunch of jerks. Works great now
Thanks for the help.. changed the sensor,thermostat, heather hoses... worked back to normal now 👍
I replaced the temperature sensor disconnected the battery waited 30 seconds. Worked like a charm.
yup, for the next 2-5 days. " EZ fix" never last"
@@jonathanRodriguez-nw5ez mine did this , what could it be thermostat?
@@jonathanRodriguez-nw5ez there is always a negative person in comments
@michaelmosley1817 change both thermostat and also the sensor
After replacing the sensor it was not an immediate fix. After some driving 2 miles or so, it did fix the issue, I figured maybe computer and it needed to take time?
On these type of trucks the thermostat will go bad and then it causes the temp sensor to go bad. That is why the fans kick on as soon as you start the car. If it were just the thermostat (even if stuck open) the high fan would not cone on. The high fan is controlled by the thermostat temp sensor. If the sensor is working right and the thermostat is stuck open the high fan won't come on until the engine begins to overheat. When you are driving in cold weather your engine may never get hot enough to engage the high fans because all of that cold air passing through the fins of the radiator. Throwing parts at a car instead of taking the necessary time to accurately diagnose the problem can and likely will cost you more money and aggravation than doing it the right way.
So it's safe to say, just replace both?
Mine started doing this but it doesn’t throw any codes so I have the same question as the person before me. Replace both?
@@jayhdez2329 I would say replace both, doesn’t hurt to have good working parts to maintain your vehicle if it’s affordable and easy to do yourself
My fan started doing the same but no codes and we replaced the sensor and still same. Guess will try the thermostat too. And go from there.
My truck is doing the same. Replaced both and still not fixed. Also no check engine light either
No mames. Eres un chingon. Se resolvió mi problema de un tahoe 2005. Excelente video.
If you let the engine cool down you can then remove any pressure that's left over by removing either the radiator cap or the coolant system reservoir cap whichever application your vehicle has. When you get a burnt light was on that video you run the risk of contaminating electrical connectors and or causing a short on other electrical items.
Great video. Our 2015 Tahoe is doing the same thing.
I big thumbs up 👍🏽 .
Straight to the point , when people are in need of help .
No bull shit talking on and on ,
Thanks for the help .
Cheers 🍻
Accept he was wrong. The problem was both the thermostat and the temp sensor. Thermostat went bad which cause the engine to overheat one too many times period as a result the temperature thermostat sensor went bad thereby causing the high fan to always take on as soon as you turn the car on. If it were just a thermostat the high man would not turn on until the engine got too hot. It is the temperature sensor that controls that high fan. FWIW, yes the temp sensor wiring harness is connected to AC compressor and defroster. That's WHY THE HIGH fan kicks on when you turn on the defrost or a/c.
You are the man, worked like super great 👍
Thanks for the video. I have a similar problem but I also have a Check Engine Light too. Could these be related also does it have anything to do with cold weather?
Replace the same parts and you will fix the problem.
Yea mine only does this in the winter.. why?
If you replace the fan sensor or the sensor by the Thermostat housing. Unhook your positive cable on your battery. It will reset everything. I didn’t have to replace the thermostat. Went up to right temperature fan stayed off. Turned off truck fan stayed off too. Took the truck for a drive, no overheating issues either.
Great mechanic and thanks for always replying. 🙏
Disconnect the battery and if the fan still stays running,then your vehicle is a Christine.
Thanks for the video! It worked.
happened to me last night and it didnt work until i cleared the code then it worked, i cleared the code by disconnetcing the battery for a few minutes and that work.
Yes, I removed the neg. batter cable for a minute and it worked! Thanks.
Is there a second engine temperature sensor other than the coolant sensor that is beside the thermostat? Any ideas on where it would be located?
You should disconnect the temperature sensor to see the fan stop or still run . To sure the temperature sensor.
Do you have a walkthrough on how to actually replace the thermostat?
Yes
Thank you bro you saved me !!
subscribed master a question to change all that you need to disconnect the battery 🔋???
What if you replaced the bad sensor, the fan no longer blew hard, the gauge went past 160,you drove it for a month with no problems, but suddenly it started again? What could be the issue?
If the fan stays on when car is off, its a bad thermostat. Replace it and clear check engine light. This fan has 2 speeds, low speed and high speed. Low speed on idle and high speed when the car hit temp or with ac on. Either mode doesnt work, check the fan relay, replace the fan if needed. If the coolant temp gauge doesnt work properly, replace the coolant temp sensor with oem sensor. If you replace it with oem sensor and still have same problem, either computer is bad or cluster is bad (wiring issue).
I disconnected the battery for 5min. Now its good. Well see how how long it lasts.
Very helpful. Thank you.
On the side note, it could always be your temperature sensor, are your thermostat, in my case, I didn't replace either and I did not disconnect the battery but I brought the coolant to the proper level, put her in reverse and slammed on the gas, next thing you know. Back on the road, thermostat was probably stuck closed.
Thanks a lot for the info
P0128. New thermostat. Buy gm or equivalent. Do not purchase Amazon junk. Clear codes or disconnect battery. Ct sensors generally only break if you beat them with a hammer.
I had same problem, changed temperature sensor an thermostat, fan still kept running, no check engine light on. Disconnected battery and started temperature hand moved up an fan didn't come on. Disconnecting battery was the trick.
I had the same problem. After watching the video I checked the temp sensor with a meter and found it to be open. Replaced the sensor but problem still existed. I did not have a check engine light, but I checked the codes and I did have the PO 128. As soon as I cleared the codes the fans immediately stopped.I rechecked the sensor after replacement, and it’s checking good now? It must be intermittent. Working fine now
i have a 2015 silverado with the V6 and i'm driving the other day and glance down at the temp gauge and the thing is pegged all the way to hot so i kinda freaked and had a mile to go so when i got home i popped the hood and nothing seemed wrong or over heated but the fans were not running and i had no idea the thing had electric fans i thought it ran off a belt like the old days, that's how out of touch i am with cars. so i let the thing cool off for a few hours and ran it again at idle for 30 minutes and nothing happened with the temp gauge, no check engine light and no message on the dic however the fans would only come on for 30 seconds and then shut off , the outside air temp was 30F. i brought the truck to the local garage whom i trust and they found nothing wrong and to keep an eye on it but i hope the thing doesn't leave me flat some day.
Fans run and turn off and run is normal. As long as the engine not smoking then its not overheating. The problem could be coolant temp sensor could be going bad. If it happen again, change the sensor first.
ok, so i couldn't get the condition to happen again and when they were checking it out at the garage the same the guys there did not want to replace parts w/o the proof it's bad. i would have done it all myself and still have the tools but i'm in my 70's and i've gotten away from it. thnx for the info. @@Ah_Duuu_Ma
I did all that but fans still kept running,so I disconnected the negative battery cable for a couple minutes,rebooted and it worked
Hello I’m have same problem I’m ready change temperature Sensor still have problem cuestión need change thermostat to ????
You have to replace both. Thermostat and coolant temp sensor. After you replace the parts, clear check engine light (even if there's no code).
What direction does your cooling fan pull air? Through the radiator into the engine bay or from the engine bay out to atmosphere?
A fan pulls the atmospheric air in that's why in the heat of summer, in traffic jams you will see cars overheating. You have to have atmospheric air for the motor to turn. Air, water, and fuel.
What if I don’t have that code clearer thing will my truck still work?
Take your car to autozone or oreily store. Ask them to run the code and have them clear it for free.
Disconnect battery and reconnect it worked
I’m having this problem but no check engine light I already changed both with oem parts and still keeps doing the same thing
Check if the thermostat connector, make sure the wires are good no damage (check for power and ground, if you know how). Check for any leak if coolant is not enough, both upper and lower hoses are evenly hot, thats mean the thermostat is opening. If the coolant system is not completely bleed, air still trap in the system. Maybe radiator could be clogged. "Key On Engine Off" pull the fans fuses for it to reset, and clear the code before restarting engine (even if theres no code showing).
@@Ah_Duuu_Ma thanks I did everything except reset the fuses after I did that everything is fine now
@@oTeckz how you reset fuses
Replaced cts fan still comes on.try thermostat tomorrow
Lol you didn't let it run long enough for the PCM TO recognize the trouble code has been repaired.
My truck does this intermittently... do you think that would be the same thing? Or maybe just the thermostat?
Replace the thermostat and clear the CEL before starting engine.
@@Ah_Duuu_Ma whats CEL?
@@rosibelmartinez686 check engine light
So, just when I thought the problem disappeared. I reset the code. for a minute, my fan didn't go on, which sounded good now. I have code P0532. What should I be looking for?
P0532 - a/c low refrigerant, means low on freon (a/c won't be as cold). Check the a/c lines and valves for leak. Check a/c compressor for leak (green color dye with special neon light). If everything is good, go recharge the a/c system.
Man, was that thermostat easy to get to, wish it was like that for other vehicles.
My truck does the same thing intermittently but I don’t get a cel.
At least your truck turns on....
Is it safe to drive a couple days before I'm able to get this fixed?
That’s what I need to know mines doing the same thing idk if i should drive it or not
Yes it is still ok to drive but as long as theres no coolant leak, make sure the gauge doesnt reach up to HOT, and make sure the fan doesnt stay on when you turn off the car.
Why does no one show how to remove the connection? Tugging on it will not work, is there a pressure point or maneuvering that can be shown or explained?
Is it bad to drive like this till I have time to fix it
Yes its bad. If the radiator fans stay all time, it could drain the battery, burn out the fan when its too hot, the temp gauge could be going up to overheat. Fix the problem, clear the check engine light before you drive.
Poop. I just did both and fan is still goin.
Try to pull the fuse and see if it reset itself.
What of the cel is not on but the gauge was not ready and the fans were staying on?? I changed the thermostat, thermostat sensor. But the gauge still isn't working and the fans are staying on after I turn off the truck. Should I disconnect the battery? It might reset?
@@edwindelrio1254 mine reset after driving it for about 20 min.
@@edwindelrio1254 If you replace both parts with oem already, then clear the cel before starting again.
Fans running, could be the coolant system is not completely bleed air out. Could be clog somewhere in the coolant system thats not allowing coolant to circulate. Not enough coolant. Thermostat is not opening.
The gauge is not working, coud be defected thermostat sensor not reading right. No power and ground going into the sensor (check for broken wires or damge connector). You must replace the parts with oem, aftermarket parts could be defecteive and pull the fans fuses out to see if it reset itself.
Do you have to clear the code after you replace the thermostat? I’m having this exact issue, replaced the thermostat but it’s still having the same issues.
Yes you have to clear the codes first before you start the engine.
@Mike CAMPOY Check the fuse, make sure its not blown. Check the fan connector, make sure its not burnt or damage wires. Check for power and ground at the cooling fan connector (if you know how). Replace the thermostat with OEM part.
Mines just started to do dis but my heater works fine..maybe my temperature sensor
same here, any update on yours?
It was my thermostat..
Hey I have the same problem but my ac is leaking or not throwing cold air
Not blowing cold could be leak, ad ac compressor, low on freon, or bad blend door motors.
I changed my raditor and coolojg fan idk why it wont shut of the fan after turn the car off😢
Because you replaced the wrong part. Replace there thermostat and coolant temp sensor, clear the check engine light (even if there's no light on), this will save the problem.
Ok. Just changed thermostat and temp switch. Now the fans will not come on. Help!!!
Give me more details. Did the fans work before? Any check engine light code? Does it the temp gauge working normally?
Disconnect the.
Battery wait a few minutes reconnect worked for me no money span
Disconnecting battery doesn't solve the problem, it turn off the check engine light for now. The problem is still there, will come back sooner or later because you didn't fix the problem. The check engine light code will be save as memory code. You can disconnect the battery if you have fixed the problem.
Mine started doing this like on it will turn on the fan but won’t turn off after I turn off the truck.
Replace the same thing I did.
Did u replaced the relay?
Or just sensor n thermostat?
@@sergioalfaroeltopo Replace the sensor and thermostat. You don't have to replace the relay.
Brother can you help me I start tha car than fans still working any time I don't know why
Do the same thing in the video replace the thermostat and clear code before drive.
If you get a scanner and erase the codes your fans will start working fine and your temperature will read but that’s not the fix cause it will do it again if you drive it for an hr or so
Some parts has failed, so thats why the fans stays on. Clearing the code wont fix it. "Replacing the parts and clear the codes will solve the issue."
Gracias
I did the same changes thermostat and censor but fan still goin after turning my truck off I'm very confuse can someone helps thanks
Clear the code or disconnect battery
Its your thermostat bro it happen to me i change the coolant temperature sensor but nothing, the thermostat its going to be your problem
I replace my transmission & my problem was fixed...
Disconnect the batt to turn fan off,and to reset the system, need more experience as a mechanic before vids are posted
Clear it with a good scan tool
i have to stop watching these videos on youtube all of a sudden i think i can fix anything...lol most of the time i end up doing it but i should stay in my lane ill leave my issue to a mechanic im pretty sure its a scensor issue for me but whatever.
How to remove top cover
My mechanic change the sensor twice already and my fan still has the same problem. When I start it it's fine but while I'm driving the temperature meter will just drop and my fan turns on immediately. What can the issue be?what do suggest to do?
Make sure you buy the oem part, dont buy aftermarket sometime dont work. Replace ect sensor and thermsotat oem first. Make sure you clear the code right after replacing the parts.
@@Ah_Duuu_Ma Thank you I will try this. I appreciate you getting back to me soon.
@@rosibelmartinez686 any luck? I'm having the same issue.
@@LackLusterMedia yes my mechanic did all that Ah Duuu said to do and it worked.
@LackLusterMedia Changing the ECT censor won't do the work itself, change it twice, and it didn't fix the problem. You have to replace the thermostat and clear the code. Make sure to use the OEM part. There are inexpensive
Make sure you clear the code first
Only needed a thermostat.
Yes
Fan not turning on high engine getting hot
Check the both fans fuses and wires for broken / damaged and check the connectors for loose connection, pins damaged or corrosion (poor connection). Check if there's power at the connectors (if you know how) or the fan itself is bad. Try to pull the fuses to see if the fans reset itself.
The module in the fan is bad
I dont click like . Sorry