Buick 2006 Rendezvous Owner's Manual page 357

3.5L V6 Engine shown, 3.6L V6 Engine similar
6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fans.
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 DEX-COOL
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 arrows on the pressure cap line up properly.
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coolant mixture
3.5L V6 Engine shown, 3.6L V6 Engine similar
9. Then fill the coolant recovery tank to the full
cold mark.
10. Put the cap back on the coolant recovery tank.
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