Dodge ZB 2005 Service Manual page 1078

ZB
ACCUMULATOR (Continued)
STANDARD PROCEDURE - REFRIGERANT SYS-
TEM EVACUATE).
(13) Charge the refrigerant system (Refer to 24 -
HEATING & AIR CONDITIONING/PLUMBING -
STANDARD PROCEDURE - REFRIGERANT SYS-
TEM CHARGE).
HEATER CORE
DESCRIPTION
The heater core is mounted in the HVAC housing,
located behind the instrument panel. The heater core
is a heat exchanger made of rows of tubes and fins.
The heater core inlet and outlet tubes are integral to
the heater core and cannot be serviced separately.
The heater core can be serviced by removing the
HVAC housing from the vehicle.
OPERATION
Engine coolant is circulated through the heater
hoses and heater core at all times. As the coolant
flows through the heater core, heat removed from the
engine is transferred to the heater core fins and
tubes. Air directed through the heater core picks up
the heat from the heater core fins. The blend door
allows control of the heater output air temperature
by regulating the amount of air that is flowing
through the heater core within the HVAC housing.
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, dis-
able the airbag system before attempting any steer-
ing 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 air-
bag system. Failure to take the proper precautions
could result in accidental airbag deployment and
possible personal injury or death.
WARNING: Refer to the applicable warnings and
cautions for this system before performing the fol-
lowing operation (Refer to 24 - HEATING & AIR
CONDITIONING/PLUMBING - WARNINGS) and (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMBING -
CAUTIONS). Failure to follow the warnings and cau-
tions could result in possible personal injury or
death.
NOTE: The heater core can be removed for service
without disassembling the HVAC housing.
(1) Remove the HVAC housing from the vehicle
and place it on a bench (Refer to 24 - HEATING &
AIR CONDITIONING/DISTRIBUTION/HVAC
HOUSING - REMOVAL).
(2) Remove the blend door actuator from the
HVAC housing (Fig. 15) (Refer to 24 - HEATING &
AIR CONDITIONING/CONTROLS/BLEND DOOR
ACTUATOR - REMOVAL).
(3) Remove the screw that secures the heater core
tube retaining bracket to the HVAC housing.
(4) Remove the heater core from the HVAC hous-
ing.
INSTALLATION
(1) Position the heater core into the HVAC hous-
ing.
(2) Install the heater core tube retaining bracket
and tighten the screw securely.
(3) Install the blend door actuator (Refer to 24 -
HEATING & AIR
BLEND DOOR ACTUATOR - INSTALLATION).
NOTE: If the heater core is being replaced, flush the
cooling system (Refer to 7 - COOLING - STANDARD
PROCEDURE - COOLING SYSTEM CLEANING/RE-
VERSE FLUSHING).
PLUMBING 24 - 49
CONDITIONING/CONTROLS/