Heater Core: Description and Operation

Front Heater Core

Description






The heater core for the front HVAC system is located in the HVAC housing, behind the instrument panel. It is a heat exchanger made of rows of tubes and fins (2). The heater core tubes (4) are attached to the side of the heater core by metal retaining clips (3) and O-ring seals. Foam seals (1) assure that all the air flowing through the HVAC housing is directed through the heater core. The heater core is secured to the HVAC air distribution housing by a plastic cover.

The heater core tubes are not serviced separately from the heater core. The HVAC housing must be removed from the vehicle to service the heater core.

Operation

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 doors 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 must be replaced if restricted, leaking or damaged.