1998 Buick Century Owner's Manual - Page 242

1 How to Add Coolant to the Radiator NOTICE: Your engine has a specific radiator fill procedure. Failure to follow this procedure could cause your engine to overheat and beseverely damaged. 2. Then keep turning the pressure cap, but now push down as you turn it. Removethe pressure cap. I 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 huning the pressure cap.) You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol and it will burn if the engine parts are hot enough. Don't spillcoolant on a hot engine. ~ If you hear a hiss, wait for that to stop. A hiss means there is still some pressure left.