Heater Core: Description and Operation

Heater Core:

The heater core is located in the HVAC housing, behind the instrument panel. The heater core is a heat exchanger made of rows of tubes and fins. The heater core tubes are attached to the side of the heater core and cannot be serviced separately.

Engine coolant is circulated through the heater hoses to the heater core at all times. As the coolant flows through the heater core, heat is removed from the engine and is transferred to the heater core tubes and fins. Air directed through the heater core picks up the heat from the heater core fins. The blend-air door allows control of the heater output air temperature by regulating the amount of air flowing through the heater core. The blower motor speed controls the volume of air flowing through the HVAC housing.

The heater core cannot be repaired and, if faulty or damaged, it must be replaced.