Buick Century 1997-2000
Buick Regal 1997-2000
Chevrolet Lumina 1997-2000
Chevrolet Monte Carlo 1997-2000
Oldsmobile Cutlass Supreme 1997
Oldsmobile Intrigue 1998-2000
Pontiac Grand Prix 1997-2000
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.