RAM 2500 Truck 4WD V8-5.7L VIN D (2005)
Heater Core: Description and Operation
The heater core (1) is a heat exchanger made of rows of tubes and fins. The heater core is positioned within the HVAC housing through the panel (2)
located at the front of the HVAC housing. The heater core tubes (3) are attached to the front of the heater core and are secured to the HVAC housing by
a bracket.
The heater core can be serviced by removing the HVAC housing assembly 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.
