Grand Cherokee 2WD V8-5.7L VIN 2 (2005)
Heater Core: Description and Operation
The heater core (1) is mounted into the HVAC air distribution housing, located behind the instrument panel. The heater core is a heat exchanger made of
rows of tubes and fins. The heater core tubes (2) are attached to the HVAC housing by a bracket and screw (3) and to the heater core by a flange and bolt
(4).
The heater core can be serviced without removing the air distribution housing from the vehicle.
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(s) 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.