Dodge Nitro. Manual — part 732

Fig. 9: Snap Ring Pliers 9764
Courtesy of CHRYSLER LLC

CONTROLS

ACTUATOR-BLEND DOOR

DESCRIPTION

ACTUATOR-BLEND DOOR

Fig. 10: Identifying Blend Door Actuator, Integral Wire Connector Receptacle, Integral Mounting Tabs
& Output Shaft
Courtesy of CHRYSLER LLC

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

The heating-A/C system uses a reversible, 12-volt direct current (DC) servo motor which mechanically
positions the blend-air door. The blend door actuator (1) is located on the driver side of the HVAC housing.

The blend door actuator is interchangeable with the actuators for the mode-air doors and the recirculation-air
door. Each actuator is contained within a black molded plastic housing with an integral wire connector
receptacle (2) and integral mounting tabs (3) that allow the actuator to be secured to the HVAC housing. The
blend door actuator output shaft (4) is connected to the linkage that drives the blend-air door. The blend door
actuator does not require mechanical indexing to the blend-air door, as it is electronically calibrated by the A/C-
heater control.

OPERATION

ACTUATOR-BLEND DOOR

The blend door actuator is connected to the A/C-heater control through the vehicle electrical system by a
dedicated two-wire lead and connector of the HVAC wire harness. The blend door actuator can move the blend-
air door in two directions. When the A/C-heater control pulls the voltage on one side of the motor connection
high and the other connection low, the blend-air door will move in one direction. When the A/C-heater control
reverses the polarity of the voltage to the motor, the blend-air door moves in the opposite direction. When the
A/C-heater control makes the voltage to both connections high or both connections low, the blend-air door stops
and will not move.

The A/C-heater control uses a pulse-count positioning system to monitor the operation and relative position of
the blend door actuator and the blend-air door. The A/C-heater control learns the blend-air door stop positions
during the actuator calibration procedure and will store a diagnostic trouble code (DTC) for any problems it
detects in the blend door actuator circuits (refer to HEATING & AIR CONDITIONING - ELECTRICAL
DIAGNOSTICS for more information).

The blend door actuator cannot be adjusted or repaired and must be replaced if found inoperative or damaged.

REMOVAL

ACTUATOR-BLEND DOOR

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.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Fig. 11: Identifying Actuator Mounting Bracket, Blend Door Actuator, Wire Harness Connector, Air
Distribution Housing & Screws
Courtesy of CHRYSLER LLC

1. Disconnect and isolate the negative battery cable.

2. If equipped, remove the silencer from below the driver side of the instrument panel. Refer to

REMOVAL .

3. Disconnect the wire harness connector (3) from the blend door actuator (2) located on the driver side of

the air distribution housing (4).

4. Remove the two screws (5) that secure the blend door actuator to the actuator mounting bracket (1) and

remove the actuator.

INSTALLATION

ACTUATOR-BLEND DOOR

NOTE:

LHD model shown. RHD model similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Fig. 12: Identifying Actuator Mounting Bracket, Blend Door Actuator, Wire Harness Connector, Air
Distribution Housing & Screws
Courtesy of CHRYSLER LLC

1. Position the blend door actuator (4) to the actuator mounting bracket (1) located on the driver side of the

air distribution housing (4). Make sure the actuator output shaft is properly aligned to the door linkage. If
necessary, rotate the actuator slightly to align the splines on the output shaft with those in the door
linkage.

2. Install the two screws (5) that secure the blend door actuator to the actuator mounting bracket. Tighten the

screws to 1.2 N.m (10 in lbs.).

3. Connect the wire harness connector (3) to the blend door actuator.

4. If equipped, install the silencer below the driver side of the instrument panel. Refer to

INSTALLATION .

5. Reconnect the negative battery cable.

6. Initiate the Actuator Calibration function using a scan tool. See *HVAC SYSTEM TEST .

ACTUATOR-MODE DOOR

DESCRIPTION

ACTUATOR-MODE DOOR

Fig. 13: Identifying Blend Door Actuator, Integral Wire Connector Receptacle, Integral Mounting Tabs
& Output Shaft
Courtesy of CHRYSLER LLC

The heating-A/C system uses a reversible, 12-volt direct current (DC) servo motor which mechanically
positions the mode-air door. The mode door actuator (1) is located on the driver side of the HVAC housing.

NOTE:

LHD model shown. RHD model similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro