Powertrain Control Module (PCM)
WARNING: This page is about a different car, the 1995 Pontiac Grand Prix and 1995 Oldsmobile Cutlass Supreme. However, it is still accessible from the selected car via links, so may be relevant.
Based on signals from various sensors, PCM controls A/C compressor clutch operation through A/C relay. A/C compressor clutch operation may be cut off during wide open throttle, low ambient air temperature, low engine speed and/or high coolant temperature.