CORE-HEATER
DESCRIPTION
NOTE: LHD model shown. RHD model similar.
The heater core (1) is mounted into the driver side of
HVAC air distribution housing (2), located behind the
instrument panel. The heater core is a heat exchanger
made of rows of tubes and fins and is secured to the
air distribution housing by a plastic retaining bracket
(3). The heater core tubes (4) are attached to the side
of the heater core and are secured to the HVAC hous-
ing by a removable flange (5).
The heater core can be serviced in the vehicle without
removing the instrument panel.
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 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.
REMOVAL
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering
wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the
negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before
performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to
take the proper precautions could result in accidental airbag deployment and possible personal injury or
death.
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PLUMBING
LX