ACDelco GM Original Equipment 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. These original equipment A/C expansion valve kits are GM-recommended replacements for your vehicle’s original components and have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.