ACDelco GM Original Equipment A/C Refrigerant Pressure Sensors monitor the pressure of the refrigerant circuit and provide pressure data to the Engine Control Module (ECM) or HVAC control head. The ECM or control head can then regulate the compressor and cooling fan operation to maintain system pressure within the programmed parameters. This original equipment A/C refrigerant pressure sensor is a GM-recommended replacement for your vehicle's original component and has been manufactured to fit your specific GM vehicle, providing the same performance, durability, and service life you expect from General Motors.