Buick 2008 Allure Owner's Manual page 300

9. By this time, the coolant level inside the radiator
filler neck may be lower. If the level is lower, add
more of the proper DEX-COOL
through the filler neck until the level reaches
the base of the filler neck.
10. Then replace the radiator pressure cap. At any time
during this procedure if coolant begins to flow out of
the filler neck, reinstall the pressure cap. Be sure
the pressure cap is hand-tight and fully seated.
11. Check the coolant in the recovery tank. The level in
the coolant recovery tank should be at the COLD
FILL line when the engine is cold.
5-40
®
coolant mixture
How to Add Coolant to the Cooling
System (5.3L V8 Engine)
Notice: The engine has a specific cooling system
drain and fill procedure. Failure to follow this
procedure could cause the engine to overheat and
be severely damaged. If the engine's cooling system
needs to be drained and re-filled, please see the
dealer/retailer.
If you hear a hiss, wait for that to stop. A hiss
means that there is still some pressure left.
2. Then keep turning the pressure cap and remove it.
1. You can remove the
pressure cap when
the cooling system,
including the pressure
cap and upper radiator
hose is no longer hot.
Turn the pressure
cap slowly
counterclockwise.