Cutlass L4-138 2.3L VIN A FI HP (1990)
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Vacuum Solenoid Valve HVAC: Description and Operation
VACUUM SOLENOID MODULE
The vacuum solenoid module converts electrical signals from the Air Conditioning (A/C) control assembly microprocessor into vacuum commands
which position the mode, A/C-defrost, and outside air valves in the air distributor assembly. Vacuum is constantly applied to the module check valve
which distributes the vacuum to four solenoid-controlled valves in the module. When the A/C control signals the module to change an air distributor
valve position, the associated solenoid energizes and vacuum is applied to the proper actuator.