Avenger L4-2.4L (2009)
Air Door Actuator / Motor: Description and Operation
Blend Door Actuator - Description
DESCRIPTION
The blend door actuator (1) for the heating-A/C system is a reversible, 12-volt Direct Current (DC) servo motor, which is mechanically connected to the
blend-air door. The blend door actuator is located on the left side of the HVAC air distribution housing.
The blend door actuator is interchangeable with the actuator for the mode-air doors 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 (3) with splines that
connect it to its respective door linkage and 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
instrument panel 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. Once 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 calibration procedure and will store a diagnostic trouble code (DTC) for
any problems it detects in the blend door actuator circuits.
The blend door actuator cannot be adjusted or repaired and it must be replaced if found inoperative or damaged.
Mode Door Actuator - Description
DESCRIPTION
