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.

3.5L V6 Engine

3.9L V6 Engine

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. Do not 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.

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Buick 2006 manual How to Add Coolant to the Radiator