2002 Pontiac Grand Prix Owner's Manual - Page 243
2002 Pontiac Grand Prix Manual
Page 243 highlights
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. 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" in the Index for more information on location. 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. 5-19
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