A/C Compressor Control Relay
WARNING: This page is about a different car, the 1996 Buick Park Avenue and 1996 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
The compressor control relay cycles the compressor clutch on and off by energizing the compressor clutch coil. With ignition on, battery voltage is applied to compressor control relay. The compressor clutch relay is grounded by the Powertrain Control Module (PCM). When A/C or defrost mode is selected, the pressure cycling switch is closed, and relay energizes compressor clutch.