Good video. Just did mine and it worked great. No leaks. I did have to reset the battery though and A/C started blowing cold and temp gauge came up to normal.
This seems like a common problem in 2018's GM Canyon and Colorado. I have had it happen twice thus far, so I'll have to make a decision to take it to the dealership or try to replace it myself. Your video is going to be very helpful if I decide to do it. Many times, you don't know if the dealership mechanic does a good job. All the little quirks you mentioned are sometimes issues the dealership annoys.
Was just at the dealership trading in my 21 at4 when I got home and this started on me! Thank god the battery idea worked. Trading in the truck today! They can have the problem…
Thank you for the helpful video I have a 2017 Colorado V6 with the same issue. I also bought an engine temp sensor, it will be a pain to fix because it's under the intake manifold but it's only a $13 part so I'm going to start there. If the issue persist this will be my next step
Unfortunately you will find the thermostat is sticking open. Check the OBD and you will find a P0128 code, indicating the coolant is getting warm enough.
The fan runs because the computer is getting no reading from your faulty temp sensor. Mine starting doing this last December, rarely, then became more frequent. I finally replace the temp sensor a couple weeks ago. The thermostat is a mechanical reactive device that the computer doesn't care about. You can get away with unplugging your battery for a while to reset things, or just leaving your truck off for several hours. Eventually, don't worry, it will happen all the time. The fan will run all the time at full speed while the engine is running and about 1/2 speed when you shut off the engine. After 5 minutes or so, the fan will finally shut off.
My 2018 colorado's fan would come on high speed and stay on for a while after shutdown. I found the coolant was low so i topped it off, still was happening even if it was running less than a minute or two. I disconnected the positive cable off the battery after seeing comments on other related videos, now its working fine. I still want to do a complete coolant flush and fresh fluid. Its at about 72000 miles.
My 2021 had same issue. Changed the thermostat and fixed the issue. Air conditioning worked. Temperature gage worked. Fans no longer ran constantly. There must be an electrical sensor which tells computer to shutdown temp gage and air conditioner. Tells fans to run. The thermostat is purely mechanical, not electrical. So, what is telling the computer to do what it does?
If you experience that the temperature goes down that should stop the fan? Then this is something with electrical stuff and controls failure, Your temperature sensor look fine as you explain… So look like no issues with thermostat
This is an issue with GM. You would think that the fan would shutoff if the vehicle is cool but it doesn’t. When the error happens it keeps the fan on. The reason was because my thermostat was stuck on open. Very weird right? That’s the way GM designed it. The issue was the thermostat was stuck on open and that’s what triggers the behavior we see
@@mambrake my friend hope it goes well with your repairs, Still not clear for me, stuck open.. fan doesn’t stop… temperature down.. strange how these combined together? Before you repair, If the fan turns on, does the radiator give hot airflow? I think probably it’s with fan controls and electrical stuff.. as you mentioned when you remove battery it will gone for a while.. then it might work properly for a while too, meaning that the thermostat doesn’t have issues
@@maythamabdulhassan189 The truck has been repaired for a while already. It's working perfectly. I don't know if you work with new model cars but they are not your regular old school cars. The computer runs very differently. This is what the Truck does if the thermostat is stuck open. This is the behavior. The reason it stops when you unplug the battery is because it resets the computer. Sometimes it can run normally for months then the thermostat gets stuck again and behaves the same.
Good video. Just did mine and it worked great. No leaks. I did have to reset the battery though and A/C started blowing cold and temp gauge came up to normal.
@@RobertSalas-w9v Thanks brother. Glad yours is working again🙏
This seems like a common problem in 2018's GM Canyon and Colorado. I have had it happen twice thus far, so I'll have to make a decision to take it to the dealership or try to replace it myself. Your video is going to be very helpful if I decide to do it. Many times, you don't know if the dealership mechanic does a good job. All the little quirks you mentioned are sometimes issues the dealership annoys.
It’s crazy because I started to here about it this year when it happened to me
Thanks Carlos - appreciate the 10 sec tidbit right at the start.
@@Risen.Phoenix Did it help you out?
Was just at the dealership trading in my 21 at4 when I got home and this started on me! Thank god the battery idea worked. Trading in the truck today! They can have the problem…
@@supermotog450x4 😂😂😂😂😂😂😂
Thank you for the helpful video I have a 2017 Colorado V6 with the same issue. I also bought an engine temp sensor, it will be a pain to fix because it's under the intake manifold but it's only a $13 part so I'm going to start there. If the issue persist this will be my next step
Hope that it does fix it for you🙏
Unfortunately you will find the thermostat is sticking open. Check the OBD and you will find a P0128 code, indicating the coolant is getting warm enough.
@@Highmiles Yea sir. That was the issue
The fan runs because the computer is getting no reading from your faulty temp sensor. Mine starting doing this last December, rarely, then became more frequent. I finally replace the temp sensor a couple weeks ago. The thermostat is a mechanical reactive device that the computer doesn't care about. You can get away with unplugging your battery for a while to reset things, or just leaving your truck off for several hours. Eventually, don't worry, it will happen all the time. The fan will run all the time at full speed while the engine is running and about 1/2 speed when you shut off the engine. After 5 minutes or so, the fan will finally shut off.
Amen
My 2018 colorado's fan would come on high speed and stay on for a while after shutdown. I found the coolant was low so i topped it off, still was happening even if it was running less than a minute or two. I disconnected the positive cable off the battery after seeing comments on other related videos, now its working fine. I still want to do a complete coolant flush and fresh fluid. Its at about 72000 miles.
@@jeffrosier3632 It’s your thermostat. The problem will arise again when it get stuck open. It’s the thermostat
Thank you so much man big help
Anytime brother
I had the exact same issue and it was 100% my thermostat
It is very odd and some people don’t believe it but it is the thermostat 😂😂
Just checking in. Is it still working?
Yes sir
Excellent video; I have a Colorado and it happened to me yesterday. How long did you run the vehicle with the coolant cap off to bleed the system
The system bleeds itself. It has a spring on the cap that lets air and sometimes coolant out but I just let it get real hot until the thermostat opens
I'm having the same issue with my gmc. Just unplug the positive on the battery? For how long?
About 20 seconds but the problem might come back
did this end up fixing the problem?
Yes sir. That was the problem. Stuck thermostat. It ran with no issues after that
That is not the issue. Your issue is going to be the coolant temp sensor. It is next to the thermostat, in an odd location
@@Christopher-os2fo Its not the sensor. It was the thermostat stuck open. The issue is fixed
I have got the same issue with my truck,
I would be grateful if you could send me thermostat’s part number?
and How much coolant water did it need ?
I just went to Autozone and bought one for my truck…
My 2021 had same issue. Changed the thermostat and fixed the issue. Air conditioning worked. Temperature gage worked. Fans no longer ran constantly.
There must be an electrical sensor which tells computer to shutdown temp gage and air conditioner. Tells fans to run.
The thermostat is purely mechanical, not electrical. So, what is telling the computer to do what it does?
@@jimwoody3056 It’s all a mystery to me
Use degreaser you’re going to break that black plastic housing for the hose and should’ve replaced the coolant temperature sensor while you were there
Only the thermostat was needed. Truck works as new. No need to replace parts that are working.
Would it be the same for a 2021 gmc canyon ?
@@JesusMartinez-sd2rg yes, Unless they changed the engine which I don’t think they did.
If you experience that the temperature goes down that should stop the fan? Then this is something with electrical stuff and controls failure,
Your temperature sensor look fine as you explain… So look like no issues with thermostat
This is an issue with GM. You would think that the fan would shutoff if the vehicle is cool but it doesn’t. When the error happens it keeps the fan on. The reason was because my thermostat was stuck on open. Very weird right? That’s the way GM designed it. The issue was the thermostat was stuck on open and that’s what triggers the behavior we see
@@mambrake my friend hope it goes well with your repairs,
Still not clear for me, stuck open.. fan doesn’t stop… temperature down.. strange how these combined together?
Before you repair, If the fan turns on, does the radiator give hot airflow?
I think probably it’s with fan controls and electrical stuff.. as you mentioned when you remove battery it will gone for a while.. then it might work properly for a while too, meaning that the thermostat doesn’t have issues
@@maythamabdulhassan189 The truck has been repaired for a while already. It's working perfectly. I don't know if you work with new model cars but they are not your regular old school cars. The computer runs very differently. This is what the Truck does if the thermostat is stuck open. This is the behavior.
The reason it stops when you unplug the battery is because it resets the computer. Sometimes it can run normally for months then the thermostat gets stuck again and behaves the same.
that would be the coolant temp sensor gone bad
Nope sorry. It wasn't that. It was the Thermostat stuck open
Wrong
@@mambrake🎯
My kid is a gm tech and it was an easy fix for him, throttle body off and access was easy…did a coolant flush as well
@@vinnier6 I didn’t have to take the throttle body off at all, but I wish I had better tools😂😂