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Originally Posted by TransAm4Life
A/C makes the engine run hotter.
Heater On makes the engine cooler.
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yes and no...on both accounts....when you turn the a/c on especially on cars with 2 fans the second of the two fans normally will come on helping to lower the temps, however because your running another accessory off of hte crank the engine stresses more and creates more heat so the usually equal out...turning the heater on as far as i know just blows air over the heater core which is basiclaly a mini radiator so again cooling little mini radiator can help sometimes.