A/C Vacuum Solenoid Module
WARNING: This page is about a different car, the 1995 Oldsmobile Cutlass Supreme. However, it is still accessible from the selected car via links, so may be relevant.
Vacuum solenoid module converts electrical signals from A/C control assembly microprocessor into vacuum commands which position the mode, A/C-defrost, and outside air valve in air distributor assembly. Vacuum is constantly applied to module which distributes vacuum to 4 solenoid controlled valves in module.