my 1991 caprice works overheats when the A/C is turn on,what if any should be the problem.Rafy.

personally i would check to make sure u have enuff antifreeze.and second i would go wit a cooler thermostat to keep the car from gettin as hot...

I had those same problems with the stock radiator in my car. Replacing it with a thick 4-core from a 454 Silverado cured it. Now it never gets hot.