Heater Core: Description and Operation

Fig.15 Heater Core:

The heater core is located in the HVAC housing. The core is a heat exchanger made of rows of tubes and fins.

Engine coolant is circulated through heater hoses to the heater core. As coolant flows through the heater core, heat is transferred to the heater core fins and tubes. Air directed through the heater core fins, picks up the heat. The temperature control door controls heater output air temperature by controlling the air flowing through the HVAC housing. The heater core cannot be repaired and must be replaced if damaged.