Buick 2005 LaCrosse Owner's Manual page 308

3.8L V6 engine shown, 3.6L V6 engine similar
8. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fans.
5-32
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.
®
coolant mixture