How to Add Coolant to the Radiator- Page 218

First Edition for Buick LeSabre Owner’s Manual – 1999

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W–35–1020–S

How to Add Coolant to the Radiator

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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.