Automatic Temperature Control (ATC) Solenoid and Manifold
WARNING: This page is about a different car, the 2006 Mercury Mountaineer and 2006 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The ATC solenoid and manifold uses 5 internal solenoid-type valves to distribute vacuum to the vacuum control motors and heater control valve based on the dual-zone EATC module settings. Manifold vacuum is always available at the ATC solenoid and manifold from the vacuum reservoir when the engine is running. The 4 vacuum control motors and the heater control valve vacuum lines are each connected to a separate internal solenoid. The dual-zone EATC module will apply voltage to the desired solenoids to open the solenoid to the manifold vacuum supply and complete the vacuum circuit to the desired component.