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GMC 1998 Yukon - How to Add Coolant to the Radiator

GMC 1998 Yukon
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How
to
Add
Coolant to
the
Radiator
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 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.
2.
Then keep turning the pressure cap, but now push
down as you turn it. Remove the pressure cap.
5-19

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