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Home >> Buick >> 1969 >> Wildcat Base, Automatic Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Automatic Temperature Control >> Description & Operation >> Program Vacuum Disc Switch

Program Vacuum Disc Switch

Mounted on PVA mounting bracket and linked to PVA door linkage. This switch controls vacuum actuators which operate the Heater-Air Conditioner Air Door (Heater or A/C mode), Outside-Recirculating Air Door, and water valve in accordance with PVA operation.

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