Actuator, RECIRCULATION Door: Operation

The recirculation door actuator is connected to the A/C heater control through the vehicle electrical system by a dedicated two-wire lead and connector. The recirculation door actuator can move the recirculation-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 recirculation-air door will move in one direction. When the A/C heater control reverses the polarity of the voltage to the motor, the recirculation-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 recirculation-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 recirculation door actuator and the recirculation-air door. The A/C heater control learns the recirculation-air door stop positions during the calibration procedure and will store a Diagnostic Trouble Code (DTC) for any problems it detects in the recirculation door actuator circuits.

The recirculation door actuator is diagnosed using a scan tool. Refer to HVAC PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

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