A/C Vacuum Solenoid Module
WARNING: This page is about a different car, the 1996 Oldsmobile Cutlass Supreme and 1996 Buick Regal. 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 to position mode, A/C-defrost, and outside air valve in air distributor assembly. Vacuum is constantly applied to module, which distributes it to 4 solenoid-controlled valves in module.