Air Door Vacuum Solenoid Valve: Description and Operation
Switchover Valves (13 to 16):

Image Reference:
13: Switchover valve for defroster nozzle flaps (short stroke) and center nozzle flap.
14: Switchover valve for legroom flaps.
15: Switchover valve for defroster nozzle flaps (long stroke).
16: Switchover valve for main air flaps.
- All switchover valves (13 to 16) are switching to passage when energized and are activating the vacuum elements directly with vacuum.