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GMC SIERRA 1997 - How to Add Coolant to the Radiator

GMC SIERRA 1997
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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.)
2.
Then keep turning the pressure cap, but now push
down as
you
turn
it. Remove the pressure cap.
If you hear a hiss, wait for that to stop.
A
hiss means
there is still some pressure left.

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