I have a 2012 Cruze. The dumb part of this is that I can’t remember what warning I originally received from my car, but it made me check the coolant level. It was extremely low so I topped it off when the car was cold. It was fine for a while. A couple days later, my coolant was low again so I topped it off again and had a mechanic look at it. The mechanic said he put air on everything and couldn’t find a leak (he did find a transmission leak but that’s most likely a separate issue). Also the oil in my car is clean so the transmission fluid wasn’t going in there.

Fast forward 3 months and now my car is fine with the coolant levels (as far as I know ha) but when I have the air conditioning on, my temperature gauge will go past half (3/4), my air turns off, then I get an error that says “AC off due to high engine temp”. This happens at any speed (has happened at 40 mph, 65 mph, etc). Also it doesn’t always do it. I just sent this car to the same mechanic hoping that he’d find something but he drove it in the morning when it was 70 out and then in the evening when it was 90 out and didn’t encounter a problem. I drove it the next morning and it was fine, but later that day I drove it and it went past half, did the error message, but this time my air stayed on and my engine corrected itself. Nothing sounds loud in my car, unless it is actually a cooling fan and it’s super quiet. Could it be a temperature sensor? And why was my coolant leaking and now it’s not? The mechanic has good ratings and I don’t want to take it a huge corporate mechanic and get charged a ridiculous amount.