GMC C-Series 2001 Owner's Manual page 193

4. Then fill the coolant recovery tank to the HOT
LEVEL mark on the vehicle with the specialty hood,
-
or approximately one
the sloped hood.
5. Put the cap back on the coolant recovery tank, but
leave the radiator pressure cap off.
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(s).
5-26
half full on the vehicle with
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
through the filler neck until the level reaches the
base of the filler neck.
R
-
COOL coolant mixture
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 like this.