Sprinter 2500 L5-2.7L DSL Turbo (2003)
Air Door Actuator / Motor: Description and Operation
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
ATC 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 heater-A/C control. When the rotary-type mode control knob 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 door.
The actuator is spring loaded so the door moves to the outside-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.
