How hot should my car run in 90 degree weather. I got a 160 degree thermostat and I just flushed the system. It seem's to run about 210 - 215ish. Is that normal??? Seem's a bit high, but I'm not sure. Any Thoughts????

 

Depends on how much air is moving across the radiator. Also make sure you bled any air out. More info about the cooling system here.

 

if you havent changed when the fans come on, then your car will run cool while you are moving... but as soon as you sit still, the car will heat up until the fans come on at 220 (I think)