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I am going to assume that you are pondering why the heater only maintains heat while the engine is running. The answer is quite simple. The engine uses a combination of anti-freeze and water to help keep it cool. The water is circulated by a water pump. The hot water moves through the heater core, which is a small radiator. The blower draws air through the fins of the heater core and heat is pulled from it. The water pump is usually belt driven, and the engine must be on in order for the coolant to circulate.

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Q: Why does heater work only when your car is idle?
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