Pontiac 2008 Vibe Owner's Manual page 246

4. Then fill the coolant recovery tank to the
FULL mark.
5. Put the cap back on the coolant recovery tank,
but leave the radiator pressure cap off.
5-32
6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
7. By this time, the coolant level inside the radiator filler
neck may be lower. If the level is lower, add more of
the proper coolant mixture through the filler neck until
the level reaches the base of the filler neck.
8. 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 ears on the pressure cap are in line with the
vent tube.