ACDelco GM Original Equipment A/C Compressors and Clutches are GM-recommended replacements for your vehicle's original components. The compressor pumps the refrigerant through the system. The compressor is typically engine driven via the accessory belt, and the clutch on the compressor is used to engage and disengage the compressor. The compressor is lubricated by refrigerant oil. This original equipment compressor and clutch have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.