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GMC 2003 Envoy XL - How to Add Coolant to the Radiator

GMC 2003 Envoy XL
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How
to Add Coolant to the Radiator
pressure cap.
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.
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.
5-33

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