Buick RIVIERA 1993 Manual page 204

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How to Ad,d Coolant to the Radiator
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 to the left 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.
1
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
mix, up to the base
of the filler neck.
202

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