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