Air Door Actuator / Motor: Description and Operation

RECIRCULATION DOOR ACTUATOR

Recirculation Door Actuator:

This vehicle uses a two-position vacuum operated recirculation door actuator to move the recirculation door. Vacuum supply to the recirculation door actuator is controlled by an integral electronic control solenoid. The recirculation door actuator is mounted on the outboard side of the ventilation housing above the blower motor in the engine compartment.

The recirculation door actuator uses engine vacuum, which is controlled by an integral electrical solenoid. The electrical solenoid is connected to the A/C-heater control through the vehicle electrical system by a dedicated two-wire lead and connector. The output shaft of the recirculation door actuator is keyed to a pivot shaft, which is keyed to the recirculation door shaft. The recirculation door actuator can move the recirculation door in two directions.

The recirculation door actuator is controlled by an electrical switch that is integral to the A/C-heater control. When the rotary-type mode control is moved to the recirculation position, a signal is sent to the electrical solenoid within the recirculation door actuator. This signal causes the solenoid to open a port to engine vacuum which pulls the output shaft into the actuator, which moves the recirculation-air door. The actuator is spring loaded so the door moves to the fresh-air position when no vacuum is supplied through the electrical solenoid.

The recirculation door actuator can be diagnosed by performing the ATC Function Test using a DRBIII(R) scan tool. Refer to Body Diagnostic Procedures.

The recirculation door actuator cannot be repaired and, if faulty or damaged, it must be replaced.