Overheating...what else Could This Be?
2006 Cobalt LS 2.2Liter Ecotec
Wife decided to drive her cobalt 4 hours the other day to Indiana (from Ohio). She got almost there, and called, said her check engine light came on.
She went to autozone, they pulled the code, and it said the engine coolant temp was high. He sold her some coolant. He added a little, but said it was about 85% full, but topped it off. So, she drove home, and there was no leaks that I could find (it was still 100% full after the fill from autozone).
Check engine light went off after about 2 hours of driving. Once she got home a few days later, her light came back on. I checked the coolant, and it's still full. I went to autozone and had them check the code, and it was the same code, engine coolant temp was high.
So, i bought the temp sensor and replaced it...no more check engine light. I noticed it still runs kind of high temperature wise..and the fan didn't kick on until it hit 220 degrees. so i went ahead and replaced the thermostat too. now that the thermostat has been replaced, the car starts up and heats to 185 and hovers there with no fan...so i thought we were all set. took it out for a drive to test it out, and it still hovered at about 185 for most of the drive. i hit a stop light and it got to 192...i get it home, park in the garage, and let it run a bit longer at an idle...but it got up to 216 degrees and i turned it off...
her car has always stayed around 180-190..hitting 195 on a hot summer day in stop/go traffic. any other ideas as to why it would be getting so warm?
Temp Sensor replaced
Coolant is topped off (from the overflow tank)
No leaks in the overflow tank, any hoses, gooseneck, etc that I can see...
To test for leaks, I drove it for about 10 mins, let it idle another 20, and zero leaks AND the fluid level was at the same spot in overflow tank.