2002 Chevrolet Impala Owner's Manual - Page 271
2002 Chevrolet Impala Manual
Page 271 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. 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 in the front of the engine compartment near the diagonal cross brace on the passenger's side of the vehicle. See "Engine Compartment Overview" in the Index for more information on location. 2. Then keep turning the pressure cap, but now push down as you turn it. Remove the pressure cap. 5-18
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