My car runs just fine while I'm driving with the A/C off. I can drive for as long as I want in the hottest temps that Vegas has to offer and it's fine and dandy. However when I turn on my A/C within 5 miles my temp guage starts moving and I reach over to turn the A/C off but leave the vent fan on and the temp guage will stop going up. I'm thinking thermostat problem but these aren't the circumstances I'm used to with a bad thermostat. BTW, this began after I installed my GT Headers/Apexi Exhaust system onto my car. Maybe just maybe my headers killed my fan? hmm... sad.gif

 

your ac fan could have died

does it work when you switch on the ac?

 

did you remove the fans when you installed the headers? If so, open the hood with the engine running. Turn on the air, and check to see which way the air flow is going. I am betting you have the wires backwards and the fan is pulling air OUT of the engine compartment and through the radiator. At an idle is not a problem.. when the car is running, it will negate any airflow passing through from the "grill" and make the car overheat

 

Either what Mad said, or you fried the fan completely. Which is possible since thats the fan closest to the headers, and they do stick out a good ways.

 

Check first the thermostat..... test it, its very easy..... just put water to boil and throw the thermostat inside.... if it "shrink" at the maximun, then it's ok... if it has any rust, change it......