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Originally Posted by schnellman
Okay, so 99% of you already know this, but I can't resist.
Turning on the AC will make your engine run hotter, not cooler.
If you really need to cool the engine a bit, turn on the heater full blast.
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Turning on the AC engages a fan that pulls air through the condenser, which also happens to pull more air through the radiator, which lowers the car's coolant temperature.
Turning on the heat operates the fan through the heater coil, which is simply just another radiator that runs through the car's passenger cabin instead of outside the car. It will also lower the engine's operating temperature, but can make things pretty uncomfortable.