Challenger V6-3.5L (2009)
Air Door Actuator / Motor: Description and Operation
Blend Door Actuator - Description
DESCRIPTION
The blend door actuator (1) is a e reversible, 12 volt direct current (DC), servo motor. Models equipped with the MTC single zone heating-A/C system
have a single blend-air door, which is controlled by a single blend door actuator.
The blend door actuator for the single zone heating-A/C system is located on the driver side end of the HVAC air distribution housing, close to the dash
panel.
The blend door actuator is interchangeable with the actuators for the mode-air door and the recirculation-air door. Each actuator is contained within an
identical black molded plastic housing with an integral wire connector receptacle (2). Each actuator also has an identical output shaft with splines (3) that
connect it to its respective door linkage and three integral mounting tabs (4) that allow the actuator to be secured to the HVAC housing. 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.
Blend Door Actuator - Operation
OPERATION
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 doors stop positions during the calibration procedure and will store a diagnostic trouble code (DTC) for any
problems it detects in the blend door actuator circuit.
The blend door actuator is diagnosed using a scan tool See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic
Trouble Code Tests and Associated Procedures.
The blend door actuator cannot be adjusted or repaired and must be replaced if inoperative or damaged.
Mode Door Actuator - Description
DESCRIPTION
