2017 Chevy Colorado thermostat replacement fans staying on and no AC fix P0128 

Videos like this are what makes RU-vid one of the most important/helpful tools on the internet. Thank you for saving me a hefty chunk of ching ching.

Mine went out recently on my 2021 colorado zr2. Dealership wanted about 1300 to fix it. That price was gonna be seperate from the 175.00 charge to run a diagnostics. I watched youtube and did it in about 1 1/2 hours. Cost me a total of $183.00 for the parts. You can get a thermostat for much cheaper. Im not a mechanic but these things come easy to me.

I just replaced my Thermostat yesterday. Thanks for putting this video up! For anyone wondering it took me less than 2 hours to do.

I looked this up AFTER paying an ASE certified dealership $1225 to fix my 2017 Colorado today. Had I seen this first, I would have done it myself. I bought an extended warranty when I bought the truck that was SUPPOSED to cover power train issues, and normally engine parts other than hoses and such are covered. Not on the Colorado. Evidently there is a "history" with this particular part, so the warranty company made this part "exclusionary." Just a heads up for all. What really pisses me off, is that the parts from the dealership (housing and gasket seal) were $207. The REST of the $1225 I paid today was for labor costs. They had my truck for eight hours, when the job can be done in two. Consider this a PSA, and thanks for the video ykmalachi.

For anyone watching this now, the "missing" gasket he was referring to is an o-ring already attached to the black plastic hose inlet. I thought the same thing when I opened the thermostat box and didn't see a new gasket. Just clean up the back side of the plastic tube and o-ring.

This video cut the job down to two hours, including my time to drive to the dealership to get the part. Thank you!

Had to come back and say thank you! This shit was very comprehensive and helpful. Great job man. Thanks to you it only took me an hour for the actual job from first ratchet turn to last. Prep and clean up took about half hour.

Thanks for the vid! Saved me $400 and only took about an hour from your help

Good stuff. Mine started doing it in the winter so I couldn’t tell that the AC wasn’t working. However mine is also intermittent. Comes and goes as it pleases. Gonna change mine now that I have the weather to do so. **Just a tip for anyone out there, there’s no fuse or relay for electric fan alone so I just unplugged at connector slightly to keep pesky thing off** I’m in the northeast so I wouldn’t recommend those living in high heat places

I have a 2018 gonna replace mine tomorrow when the new thermostat comes thanks for the video

Excellent. Short and to the point. Thanks for the tips!

thanks for this video. i have the same truck and same problems

Thank for your video I found everything I need to know about so wow here’s my turn to change 1

Hell of a video!!! Preciate ya for sharing.

Thanks for your video. Helped out tremendously.

Disconnect the negative battery cable for a minute then reinstall. Temporary fix to reset it until it gets fixed.

Now your a guy I can have a beer with and turn a wrench with. Mechanic 30 yrs now. With my own truck I cheat like Fuck. It's mine so who gives a shit. Ps, there's always a beer on my fender lol. Appreciate real people

Funny mine just went out in my 2020 driving back fron AZ with 50K on it. but got that 100k warranty. Sometimes Chev you screws us my bosses 2018 Chev Silverado blew the engine at 71000 10K for a new one good times

Ty bro, have a 2019 that started doi g this today. Still got warranty so ill let them do it while i can.

Would a SCAN TOOL have cleared the symptoms up before a thermostat change? I had these three classic symptoms (160 on gauge, fan always on and AC warm), so changed the thermostat and still no change in symptoms. Took it to my mechanic and he used his scan tool to clear the codes and now everything is wonderful again. He also said this is a self purging system, so no manual burping needed. If someone knows, let us know and thanks for the great video YKM. 2018 Denali Canyon 110k miles

I wish I'd seen this video a week ago. This exact problem happened to my 2019 Colorado. Took it to the dealer, not under warranty, and they charged me $1900 with six hours of labor. I feel like I got ripped off now...

Liked and subscribed just cause u made me laugh

I have the service manual for my 2017 GMC Canyon V6 and the thermostat replacement is listed in “engine out of the vehicle” repair section.

I have literally the exact same truck, color and all, with the same symptoms. Doesn't look like this is something I can do myself. Ugh.

I have the exact same color Colorado

Mine went on my 2017 Colorado at 120,000. Now it has 238,100 miles and it went again.

I just had the same problem with my truck a few days ago and the Dealer charged me some ridiculous price for the labor 😡, but when I picked it up I noticed that the AC was still throwing warm air (they didn't fix that issue), I took it back and now they want to charge me again but now to fix the AC Compressor 🙄😫, don't know what to do! Please help, any suggestions. thinking of just waiting on that since winter is coming

Hey Malachi. Great info on the vid. Having the same issue. Drive 2-3 days to work. Halfway to work on the 3rd, the temp drops off and the fan stays in limp after shut off. Going to replace the thermostat today. I hope and pray the inlet seal is salvageable. My question is: Will I need to empty the radiator to do this repair or will everything have settled under that point in the system and not have to flush it? Thanks for the help, man.

My fan is staying on, no codes, but the needle stays at 160, is this the same problem?

did you have to drain the radiator first or did you just pop the hose off and top it back up with coolant after getting everything hooked back up together?

I had the same symptoms..when i went to get the code read at oriellys it said it was engime coolant sensor...is the sensor a part of that whole housing that you replaced? I dont wanna replace this of its just a sensor or vice versa

I just replaced mine and still the thermostat gauge is not moving, no a/c, and fans still stay on. My second guess might be the camshaft but idk. What are your experiences guys?

Also have a 2017 Chevy colorado . My temperature gauge keeps heating up past 210 . Replaced thermostat and sensor . Still heating up

Did you ever find that other gasket I'm currently changing mine out and I can't seem to find that second gasket either

Hey brother, great video. Question for you though. I have a 2017 Chevy Colorado. AC stopped working a few months ago. Compressor, relay, and fuse are all good. Recently got a check engine light for the thermostat. Coolant wasn’t reading and engine fan would stay on during driving and 2-5 minutes after turning it off. Next day, engine light is still on but coolant is reading temp and no more fan. Day later, no engine light at all. I changed the coolant sensor to be safe. AC still doesn’t work. Any thoughts on this?

I disconnect the battery and fan went back to normal today I’ll see hose it goes because I don’t believe it’s the sensor or the thermostat. I really don’t believe that

Quick question. Just got home and fan stayed on 4 minutes after truck was off. Proble. Is i work tomorrow and is too late to buy parts tonight. Can i drive truck tomorrow to work and replace tomorrow after work? As i am off monday

How much Antifreeze will I lose during this process

So would it be my thermostat if everything reads fine for a couple weeks then randomly the gauge drops to cold, fans stays on till the battery dies or I disconnect it, then when I reconnect the battery, everything is back to normal. Temp gauge starts reading like normal...then it happens again randomly. This started after I went through a large puddle a few months back. I don't want to replace the thermostat for it to happen again because its something electical , worried it might be a computer thing. 2019 chevy colorado....85,000 miles

Took the elbow neck off and it sprayed coolant??

Just purchased a 2015 colorado z71, 3.6l....after watching videos it appears there are two locations for thermostats. One in front, and one on rear of engine. Are there multiple thermostats on these trucks?

Did you drain the coolant before starting?

I’m having theses same problems on my 2018 Colorado do u think it’s more likely the thermostat than the ECT sensor

😂🤣😅you think just like me and preclearance stuff in your way my 1st one doing today that's for info.

So I have a 2017, V6 and I CAN NOT find where this is supposed to be

Do you need to bleed out the coolant?

Hey man did you ever find the part number for the gasket you need

What is the torque ft lbs for the thermostat bolts?

turned out to be a low baattery for me, same symptoms

So this just happen to me and I replaced the thermostat and it still giving me problems

Well it’s running cold

Any one have an idea what that little holes is called ??

Lol them hose be in the way always

Hello once you put the new thermostat, does the fan turns off automatically or do you have to reprogram them?

👍🤯👍👍👍

How long did this take?

Did you find the right gasket?