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The heater core is just like having another radiator, only smaller. Once you turn your heat on, and force air through the heater core with the blower motor, the engine's coolant's temperature is lowered, and circulated back to the engine, probably right where the temperature sensor is located.

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โˆ™ 2004-12-09 06:12:46
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Q: Why would the temperature gauge drop when the heater is truned on?
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