GM Genuine Parts Multi-Purpose Relays are designed, engineered, and tested to rigorous standards, and are backed by General Motors.These multi purpose relays are electrically controlled switches that open and close circuits, and are used for multiple A/C system applications. 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).