GM Genuine Parts A/C Expansion Valve Kits are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These A/C expansion valve kits contain a new expansion valve and the related components necessary for installation. The expansion valve is a metering device that controls the flow of refrigerant through the evaporator. 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).