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Dodge Nitro. Manual - part 748

1. Position the rear floor heat duct (1) into the vehicle.

2. Connect the rear floor heat duct to the floor distribution duct (5) located in front of the gear shift lever

assembly (4).

3. Install the push-pin retainer (2) that secures the rear floor heat duct to the floor console bracket (3).

4. Install the floor console. Refer to INSTALLATION .

HOUSING-HVAC

DESCRIPTION

HOUSING-HVAC

Fig. 71: Air Distribution Housing, HVAC Housing & Air Inlet Housing
Courtesy of CHRYSLER LLC

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

Air distribution housing - The air distribution housing (1) is mounted to the top of the HVAC housing
(2) and contains the heater core, blend-air and mode-air doors and door linkage.

Air inlet housing - The air inlet housing (3) is mounted to the passenger side end of the HVAC housing.
The air inlet housing contains the recirculation-air door and actuator.

HVAC housing - The HVAC housing is mounted to the dash panel behind the instrument panel and
contains the A/C evaporator. The HVAC housing consists of a upper and a lower housing that are
attached together and has mounting provisions for the air inlet housing, air distribution housing, blower
motor and blower motor resistor.

NOTE:

Typical rear floor heat duct shown.

NOTE:

LHD model shown. RHD model similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

The heating-A/C system is a blend-air type system. The blend-air door controls the amount of conditioned air
that is allowed to flow through, or around, the heater core.

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 temperature control cable, which moves the blend-air door. This
allows an almost immediate control of the output air temperature of the system. The mode door cable operates
the mode-air doors which direct the flow of the conditioned air out the various air outlets, depending on the
mode selected. The recirculation door actuator operates the recirculation-air door which closes off the fresh air
intake and recirculates the air already inside the vehicle. The electric recirculation door actuator and the blower
motor are connected to the vehicle electrical system by the instrument panel 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, which is located in the dash panel
in the engine compartment.

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

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.

WARNING:

Refer to the applicable warnings and cautions for this system before
performing the following operation. See WARNING, and CAUTION. Failure
to follow the warnings and cautions could result in possible personal
injury or death.

NOTE:

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

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Fig. 72: Air Distribution Housing Remove/Install Components
Courtesy of CHRYSLER LLC

1. Remove the HVAC housing assembly and place it on a workbench. See REMOVAL.

2. Remove the screw (4) that secures the heater core tube flange (3) to the top of the HVAC housing (5).

3. Remove the three screws (6) and three metal clips (7) that secure the air distribution housing (8) to the top

of the HVAC housing.

4. Disengage the plastic retaining tab (1) that secures the front driver side of the air distribution housing to

the top of the HVAC housing.

5. Tip the rear of the air distribution housing slightly upward to disengage the two plastic retaining tabs (2)

that secure the front of the distribution housing to the HVAC housing and remove the distribution
housing.

6. If required, disassemble the air distribution housing. See DISASSEMBLY.

SCREEN-AIR INLET

NOTE:

LHD model shown. RHD model similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Fig. 73: Air Inlet Screen, Nuts, Cowl Panel & Retaining Studs
Courtesy of CHRYSLER LLC

1. Remove the cowl grille. Refer to REMOVAL .

2. Remove the two nuts (2) that secure the air inlet screen (1) to the cowl panel (3).

3. Slide the air inlet screen inward to disengage the screen from the two retaining studs (4) and pull the

screen straight up to remove it from the cowl.

HOUSING-AIR INLET

NOTE:

LHD model shown. RHD model similar.

WARNING:

NOTE:

The air inlet housing must be removed from HVAC housing and disassembled
for service of the recirculation-air door on all models.

NOTE:

On RHD models, the air inlet housing must be removed from HVAC housing for
service of the recirculation door actuator.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

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