Engine Cooling Function
Because the heater core cools the heated coolant from the engine it can act as the radiator of the engine. If the radiator is working improperly, the operator may turn the heat on in the passenger cabin, resulting in cooling the engine coolant and then cooling the engine. This idea only works to a certain degree, as the heater core isn’t large enough nor does it have enough cold air going though it to cool large amounts of coolant significantly.
Read more about this topic: Heater Core
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