Chevrolet 1999 Lumina Owner's Manual page 202

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How to Add Coolant to the Radiator
NOTICE:
Your engine has a specific radiator fill procedure.
Failure to follow this procedure could cause your
engine to overheat and be severely damaged.
Turn the pressure cap slowly counterclockwise until it
first stops. (Don't press down while turning the
pressure cap.)
5-18
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.
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.
CAUTION:
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol
and it will burn if the engine parts are hot
enough. Don't spill coolant on a hot engine.
2. Then keep turning
the pressure cap,
but now push down
as you turn it.
Remove the
pressure cap.
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