Pontiac 2008 Grand Prix Owner's Manual page 307

3.8L V6 Engine
10. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan(s).
11. 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.
12. Then replace the 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.
13. 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
5-37