Buick 2001 Century Owner's Manual page 236

6. Then fill the coolant recovery tank to the COLD
mark on the coolant recovery tank.
7. Put the cap back on the coolant recovery tank,
but leave the radiator pressure cap off.
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.
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
through the filler neck until the level reaches the
base of the filler neck.
R
-
COOL coolant mixture
5-19