How To Add Coolant To The Radiator - GMC 2000 Safari Owner's Manual

How to Add Coolant to the Radiator

Turn the pressure cap slowly counterclockwise until
it first stops. (Don't press down while turning the
pressure cap.)
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.
1. You can remove the
radiator pressure cap
when the cooling
system, including the
radiator pressure cap
and upper radiator
hose, is no longer hot.
2. Then keep turning
the pressure cap, but
now push down as
you turn it. Remove
the pressure cap.
5-15