How To Add Coolant To The Radiator - GMC Envoy XL 2003 Owner's Manual

How to Add Coolant to the Radiator

1. You can remove the radiator
the cooling system, including the radiator pressure
cap and upper radiator hose, is no longer hot.
Turn the pressure cap slowly counterclockwise
about one full turn.
If you hear a hiss, wait for that to stop.
A hiss means there is still some pressure left.
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pressure cap when
pressure cap.
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