2001 Chevrolet Impala Owner's Manual - Page 271
2001 Chevrolet Impala Manual
Page 271 highlights
The radiator pressure cap is located in the front of the engine compartment on the passenger's side, near the diagonal cross brace. See "Engine Compartment Overview" in the Index for more information on location. 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. 2. Then keep turning the pressure cap, but now push down as you turn it. Remove the pressure cap. CAUTION: 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 spill coolant on a hot engine. 5-17
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