An ACDelco GM Original Equipment Engine Coolant Thermostat Kit comes with the thermostat and gasket you need to replace the thermostat in your vehicle, and is a GM-recommended replacement for your vehicle's original component. The engine coolant thermostat controls the flow of coolant through the radiator to enable the engine to reach and maintain its normal operating temperature. This original equipment engine coolant thermostat kit has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.