Vacuum Control Motors

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.