CTS 2003-2005

General Information


The thermostat is used to control the flow of engine coolant. When the engine is cold, the thermostat is closed to prevent coolant from circulating from the engine to the radiator. As the engine begins to warm up, the thermostat opens to allow the coolant to flow through the radiator and the engine warms evenly to its normal operating temperature. Fuel economy and engine durability is increased when operated at normal operating temperature.