1997 Buick Century Owner's Manual - Page 247

1. You can remove the radiator pressure cap when the cooling system, including the radiator pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise until it first stops. (Don't press down while turning the pressure cap.) If you hear a hiss, wait for that to stop. A hiss means there is still some pressure left. How to Add Coolant to the Radiator NOTICE: Your engine has a specific radiator procedure. fill Failure to follow this procedure could cause your engine to overheat and be severely damaged. 5-21