Vacuum Actuators
WARNING: This page is about a different car, the 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Three vacuum actuators control movement of air distribution doors. The floor/panel door actuator and panel/defrost door actuator are mounted on the A/C-heater plenum chamber. The fresh/recirculated air door actuator is located on the intake unit and controls the fresh/recirculated air door.