Air Door: Description and Operation
AIR VALVES - HVAC SYSTEM - AUTOMATICThe air valves that control the flow of air through the A/C module are operated by vacuum actuators. Solenoid valves located in the vacuum/electric solenoid apply vacuum or vent the actuators. The solenoids are controlled by solid state circuits in the heater-A/C control. The MODE button in the heater-A/C control selects the operating mode manually. The AUTO mode button allows the heater-A/C to automatically select the appropriate mode. Depending on the mode, the heater-A/C control determines which air valve should be operated.
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