Vacuum Control Motors

WARNING: This page is about a different car, the 2005 Lincoln Navigator and 2005 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

The three vacuum control motors have the following characteristics:

They are actuated by the function selector switch.
They position the plenum doors to direct system airflow to the vehicle interior as determined by the function selector switch settings.
The air inlet door vacuum control motor is a single-diaphragm actuator with a single vacuum source.
The airflow mode door vacuum control motors are double-diaphragm actuators with two separate vacuum sources to allow the actuator to fully retract or partially retract.
When vacuum is applied to both vacuum sources, the actuator will fully retract.
When vacuum is applied only to the partial stage vacuum source, the actuator will partially retract.