Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 2339

HOUSING-HVAC

DESCRIPTION

NOTE: LHD model shown. RHD model similar.

All models are equipped with a common HVAC hous-
ing assembly that combines A/C and heating capabili-
ties into a single unit mounted within the passenger
compartment. The HVAC housing assembly consists
of three separate housings:

•

HVAC housing — The HVAC housing (1) is
mounted to the dash panel behind the instrument
panel and contains the A/C evaporator and the
blower motor resistor or power model, depending
on application. The HVAC housing consists of a
upper and a lower housing that are attached
together and has mounting provisions for the air
inlet housing, blower motor, air distribution hous-
ing and the HVAC wire harness.

•

Air inlet housing — The air inlet housing (2) is
mounted to the right end of the HVAC housing
and contains the recirculation-air door and actua-
tor.

•

Air distribution housing — The air distribution housing (3) is mounted to the rear of the HVAC housing and
contains the heater core, blend-air door(s) and actuator(s), mode-air doors and actuator and door linkage.

The heating-A/C system is a blend-air type system. The blend-air doors control the amount of conditioned air that is
allowed to flow through, or around, the heater core. The dual zone heating A/C system uses two blend door actua-
tors while the single zone system uses only one blend door actuator.

The A/C system is designed for the use of a non-CFC, R-134a refrigerant and uses an A/C evaporator to cool and
dehumidify the incoming air prior to blending it with the heated air. A temperature control determines the discharge
air temperature by operating the blend door actuator(s), which moves the blend-air door(s). This allows an almost
immediate control of the output air temperature of the system. The mode door actuator operates the mode-air doors
which direct the flow of the conditioned air out the various air outlets, depending on the mode selected. The recir-
culation door actuator operates the recirculation-air door which closes off the fresh air intake and recirculates the air
already inside the vehicle. The electric door actuators are connected to the vehicle electrical system by the HVAC
wire harness. The blower motor controls the velocity of air flowing through the HVAC housing assembly by spinning
the blower wheel within the HVAC housing at the selected speed by use of the blower motor resistor or power
model, depending on application.

The air distribution housing must be removed from the HVAC housing and disassembled for service of the mode-air
and blend-air doors. The air inlet housing must be removed from HVAC housing and disassembled for service of the
recirculation-air door. The HVAC housing must be removed from the vehicle and disassembled for service of the A/C
evaporator.

REMOVAL

HOUSING-AIR DISTRIBUTION

WARNING: Refer to the applicable warnings and cautions for this system before performing the following
operation (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - WARNINGS) and (Refer to 24 - HEAT-
ING & AIR CONDITIONING/PLUMBING - CAUTIONS). Failure to follow the warnings and cautions could result
in possible personal injury or death.

24 - 390

DISTRIBUTION

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.

NOTE: The air distribution housing must be removed from the HVAC housing and disassembled for service
of the mode-air and blend-air doors.

NOTE: LHD model shown in illustrations. RHD model similar.

1. Drain the engine cooling system (Refer to 7 -

COOLING - STANDARD PROCEDURE - COOL-
ING SYSTEM DRAIN).

2. Disconnect and isolate the negative battery cable.

3. Remove the instrument panel from the passenger

compartment (Refer to 23 - BODY/INSTRUMENT
PANEL/INSTRUMENT

PANEL

ASSEMBLY

REMOVAL).

4. Remove the defroster ducts (Refer to 24 - HEAT-

ING & AIR CONDITIONING/DISTRIBUTION/DUCT-
DEFROSTER - REMOVAL).

5. Remove the floor console duct (Refer to 24 -

HEATING & AIR CONDITIONING/DISTRIBUTION/
DUCT-FLOOR CONSOLE - REMOVAL).

6. Disconnect the HVAC wire harness (1) from the

mode door actuator (2) and the blend door actuator
(3) located on the driver side of the air distribution
housing (4).

7. If equipped with dual zone heating-A/C, disconnect the HVAC wire harness from the blend door actuator (5)

located on the passenger side of the air distribution housing.

8. Remove the two screws (1) that secure the flange

(2) to the front of the HVAC housing (3).

9. Remove the flange and the heater core tubes (4)

from the HVAC housing.

DISTRIBUTION

24 - 391

NOTE: Take proper precautions to protect the car-
peting from spilled engine coolant. Have absor-
bent toweling readily available to clean up any
spills.

10. Remove the two retaining clamps (1) that secure

the heater core tubes (2) to the heater core (3).

11. Disconnect the heater core tubes from the heater

core and remove and discard the O-ring seals.

12. Install plugs in, or tape over the opened heater

core tubes and heater core ports.

13. Remove the two screws (1) that secure the air

distribution housing (2) to the rear of the HVAC
housing (3).

14. Tilt the top of the air distribution housing rearward

to disconnect the distribution housing from the
tab-and-slot type retainers located at the bottom
of the housing.

15. Disconnect the air distribution housing from rear

floor distribution ducts.

16. Remove the air distribution housing from the vehi-

cle.

17. If required, disassemble the air distribution hous-

ing (Refer to 24 - HEATING & AIR CONDITION-
ING/DISTRIBUTION/HOUSING-HVAC

HOUSING-AIR DISTRIBUTION - DISASSEMBLY).

HOUSING-AIR INLET

NOTE: The air inlet housing must be removed from HVAC housing and disassembled for service of the
recirculation-air door.

24 - 392

DISTRIBUTION

NOTE: LHD model shown. RHD model similar.

1. Disconnect and isolate the negative battery cable.

2. Remove the HVAC housing assembly (Refer to 24

- HEATING & AIR CONDITIONING/DISTRIBU-
TION/HOUSING-HVAC - HOUSING-HVAC ASSEM-
BLY - REMOVAL).

3. Disconnect the HVAC wire harness (1) from the

recirculation door actuator (2).

4. Carefully cut the foam seal (3) along the parting

line (4) of the air inlet housing (6). If the seal is
deformed or damaged, it must be replaced.

5. Remove the five screws (5) that secure the air inlet

housing to HVAC housing (7).

6. Remove the air inlet housing from the HVAC hous-

ing.

7. If required, disassemble the air inlet housing (Refer

to 24 - HEATING & AIR CONDITIONING/DISTRI-
BUTION/HOUSING-HVAC - HOUSING-AIR INLET - DISASSEMBLY).

HOUSING-HVAC ASSEMBLY

NOTE: The HVAC housing must be removed from the vehicle and disassembled for service of the A/C evap-
orator.

NOTE: LHD model shown in illustrations. RHD model similar.

DISTRIBUTION

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