Vacuum Control Motors

The three vacuum control motors have the following characteristics:

• They are actuated by the ATC solenoid and manifold based on input from the dual-zone EATC module.
• They position the mode doors to direct system airflow to the vehicle interior as determined by the dual-zone EATC module 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.