2004 Pontiac Grand Prix Owner's Manual - Page 317

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 be severely damaged. You can remove the radiator pressure cap when the cooling system, including the radiator pressure cap and upper radiator hose, is no longer hot. 1. 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. The radiator pressure cap is located on the passenger's side of the vehicle in the front of the engine compartment, near the battery and the diagonal cross brace. See Engine Compartment Overview on page 5-12 for more information on location. 5-37