The mode door actuator is interchangeable with the actuators for the blend-air door 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
mode door actuator output shaft (4) is connected to the linkage that drives the mode-air door. The mode door
actuator does not require mechanical indexing to the mode-air doors, as it is electronically calibrated by the
A/C-heater control.
OPERATION
ACTUATOR-MODE DOOR
The mode 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 mode door actuator can move the floor,
defrost/demist and the panel-air doors 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 mode-air doors will move in one direction.
When the A/C-heater control reverses the polarity of the voltage to the motor, the mode-air doors moves in the
opposite direction. When the A/C-heater control makes the voltage to both connections high or both
connections low, the mode-air doors stop and will not move.
The A/C-heater control uses a pulse-count positioning system to monitor the operation and relative position of
the mode door actuator and the mode-air doors. The A/C-heater control learns the mode-air doors stop position
during the actuator calibration procedure and will store a diagnostic trouble code (DTC) for any problems it
detects in the mode door actuator circuits (refer to HEATING & AIR CONDITIONING - ELECTRICAL
DIAGNOSTICS for more information).
The mode door actuator cannot be adjusted or repaired and must be replaced if found inoperative or damaged.
REMOVAL
ACTUATOR-MODE 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