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It is if you aren’t getting those codes from the computer which is why this problem is so prevalent and with no answers on any of the forums addressing it. You are applying logic for other vehicles and problems to this very specific issue. I believe you have fixed lots of things on lots of cars...

Birdman is right. You need to replace the thermostat BUT you have to make sure you replace it with a 195° thermostat. I’ve had this issues with my 2008 Equinox for over a year and it was because i used a 180° thermostat. The computer wants to see the temp get to 195° after a specific amount of...

This is bad advice for this issues ^. This is a common problem with a known solution. Put a 195° thermostat back in it and your problem is solved. Suggesting the gauge is bad is general troubleshooting idea that is not specific to this issue. I speak from experience having just solved this...

Thermostat is not stuck open, it’s opening at too low of a temperature. Has to have a 195° thermostat. The autozone gold (crap) is only 180° and so are many others. Replace thermostat with correct temp is the real solution.

Solved!!!! I put a 180° thermostat in when i replaced it a year ago. GM requires a 195° thermostat in this car. Once i put the right temp thermostat in, reset the battery, all the issue went away permanently.