How To Add Coolant To The Radiator - GMC C series 2002 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.
5-26
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.
3. Fill the radiator
with the proper
R
-
DEX COOL
coolant mixture, up
to the base of the
filler neck. See
"Engine Coolant"
in the Index for
more information
about the proper
coolant mixture.