Re: Texas Heating
Have you cleaned the fins on the radiator? A partially clogged radiator can go over the top once A/C is turned on. Also, is the air dam intact on your car? That's the plastic piece below the bumper. If it's not, that can also cause overheating. Finally, has an radiator or A/C condenser work been done on this? There are plastic and foam baffles up there and if they're not replaced exactly as installed, it can cause serious airflow disruption that would show itself when the A/C is on.
Also, is the problem worse with highway driving? Or is this an in-town problem?