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Because heat from the engine is responsible for heating the heater coil which the motor blows air through. it is indeed connected to the engine cooling system which in most cases like a radiator inside your dashboard. On most vehicles when you turn on the engine, it is the only time you can use the heater but identical to it are some systems which use heater coils just like the ones you see inside a handy heat blower.

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14y ago

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