GM Genuine Parts A/C Compressor Clutch Kits are designed, engineered, and tested to rigorous standards, and are backed by General Motors. They engage and disengage the compressor, and other related components, as A/C pressure readings call for the clutch to be switched ON and OFF. These compressor clutches consist of a pulley, pressure plate, and electromagnetic coil. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).