GM Genuine Parts A/C Compressor Clutch Kits are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These kits include the compressor clutch, which engages and disengages the compressor when the A/C is switched on and off, and other related components. The compressor clutch consists 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).