No heat/cold air, temperature gauge does not work?

MANDY MCDANIEL

MEMBER
2012 CHEVROLET EQUINOX
4 CYL
2WD
AUTOMATIC
162,000 MILES

I am having problems where there is no cold or hot air coming out of the vents, just cool air. After we shut off the car/engine, the radiator fan continues to run for approximately 5 min. The blend door actuator was changed (it was clicking every time we turned on the air). That only solved the clicking. Our temperature gauge is not working either (the only thing on the dash cluster that isn't working). We changed the thermostat and cooling sensor, it worked for maybe 10 miles down the road before the gauge was back at 0, and the problem continues. I unplugged the battery connectors and after I plug them back in and run the vehicle, the temp gauge will work for a while, then back to 0, and back to the fan running after shutting off. Also, there is still no heat, or A/C, just cool air. I have brought up it bring a problem in the wiring, but I am stumped. Any ideas will be helpful that I haven't already tried. Thank you

Thursday, October 10th, 2024 AT 12:08 PM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,144 POSTS

This sounds like a combination of problems. can I ask if the coolant level is full? If the engine is overheating it will turn the A/C off, and the heater will not work well at all. If the coolant is full and the engine is not overheating, we need to run the codes in the CAN to see which ones are stored, which will guide us to the problem.

You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

It sounds like you might have a bad PCM but let's run the codes first before we get into a repair. Here is how the job is done in case we need it, you can get a preprogrammed unit by searching Google or Ebay. Check out the images (below). Please let us know what happens.

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