OK, its hot here in the midwest and I've got an AC problem. The car is my 94 850 turbo wagon. The problem is that on a very hot day like today (100+ degrees) the AC will blow cold for a while on any given temp setting, then the cold air stops and warm air is blown in. I can turn down the temp control from 72 to 66, then the problem repeats itself, first cold, then warm air. I then turn the temp control back up to 72 and the cycle is repeated. This is all done with the air mix set to introduce a minimum of hot outside air and the climate control set to recirculate. When the ac is blowing cold, it is blowing very cold air, so I don't believe a charge is the problem. The car had the evaporator repaired previously. Any thoughts or advice would be greatly appreciated.

Thanks,
Bert