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When I drive my Saturn with the air conditioning on, it only runs with cool air when my foot is on the gas. When we are at a stop or idling in traffic, the air becomes warm. This has been going on for 2 months. Now the car has overheated as well, with white smoke coming out of the hood after being driven with the air cond. on for 30 + minutes. Can this be related? Can it be the compressor over working the engine or is it a pressure relay valve?