ACDelco GM Original Equipment A/C Refrigerant Temperature Sensors measure the temperature of the refrigerant discharged from the evaporator core in the low side refrigerant line and are GM-recommended replacements for your vehicle's original components. The A/C refrigerant temperature sensor data is used to cycle the A/C compressor ON and OFF to prevent the evaporator core from freezing. These original equipment A/C refrigerant temperature sensors have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.