Heater Control Valve Vacuum Switch

The heater control valve vacuum switch controls operation of the heater control valve. The heater control valve vacuum switch:

• is mounted on the RH side of the heater core and evaporator core housing just below the defrost door vacuum control motor.
• is actuated by an arm attached to the temperature blend door RH pivot shaft.
• applies vacuum to the heater control valve when the temperature blend door is in the full COOL position.