Air Door Actuator / Motor: Description and Operation

RECIRCULATION DOOR ACTUATOR

NOTE: This vehicle uses vacuum to operate only the recirculation door. All other controls are cable operated.

Vehicles equipped with A/C have a vacuum operated recirculation door actuator. When vacuum is supplied by the A/C-heater control to the recirculation door actuator, the recirculation door moves to the RECIRC position. The actuator is spring loaded so the door moves to the Outside-air position when there is no vacuum supplied. The operation of the door can be viewed by removing the blower motor and looking up into the HVAC housing.

Normally, vacuum is supplied to the actuator by placing the recirculation control knob in the RECIRC position. The mode and the recirculation controls are mechanically interlocked so the recirculation control cannot be placed in the RECIRC position if the mode control is at/or between the mix and defrost positions. Vacuum is supplied to the actuator only when recirculation control is at the RECIRC position. If the recirculation control is between the Outside-air position and RECIRC position the system will still be in the Outside-air position. If the recirculation control is in the RECIRC position and the mode control is moved from the Floor to the Defrost positions, the recirculation control will move from the RECIRC position, to the Outside-air position beginning at the Mix position. This is to help prevent window fogging.

Normally, vacuum is supplied to the actuator by placing the recirculation control knob in the RECIRC position. The mode and the recirculation controls are mechanically interlocked so the recirculation control cannot be placed in the RECIRC position if the mode control is at/or between the mix and defrost positions. Vacuum is supplied to the actuator only when recirculation control is at the RECIRC position. If the recirculation control is between the Outside-air position and RECIRC position the system will still be in the Outside-air position. If the recirculation control is in the RECIRC position and the mode control is moved from the Floor to the Defrost positions, the recirculation control will move from the RECIRC position, to the Outside-air position beginning at the Mix position. This is to help prevent window fogging.

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