90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
Vacuum Solenoid Valve HVAC: Service and Repair
Two Way Valve
If the vacuum system fails, the fresh air/recirculation door will open and all air will be brought into the vehicle from outside.
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Remove cover under glove compartment.
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Start engine and run at idle.
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Push A/C switch button.
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Push recirculation button.
Warning light lights up, fresh air/recirculation door closes.
If warning light does light and fresh air/recirculation door does not close,
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Check voltage supply for Two way valve according to wiring diagram and repair as necessary.
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Check vacuum system and repair as necessary.