Re: 07 Equniox 3.4L with "ENGINE HOT A/C OFF" on dash.. a few questions
Good idea, I think they check them for free. The light hasn't come back on yet (well, not sure, my wife drives the Equinox and I drive my Mustang). But it was last time. When googling around, which is how I found this site, I read that it could be a thermostat issue but I just wasn't sure why a thermostat being stuck open or closed would matter if it's a problem with the gauge. If it was actually overheating and the gauge worked and showed that then I would definitely try thermostat first after checking coolant level, fans, and water pump. I'm definitely not saying you're wrong, just talking it out and thinking about it. Unless it was something like when the car gets to operating temperature and the tstat SHOULD open that's when the ecm goes crazy and just drops the sensor reading. I don't know. The Equinox has 80,000 miles on it and it probably wouldn't hurt to change the thermostat anyways as long as it's as easy to change as a regular, older, car.