Oldsmobile INTRIGUE 2001 Owner's Manual page 226

CAUTION:
Adding only plain water to your cooling system
can be dangerous. Plain water, or some other
liquid like alcohol, can boil before the proper
coolant mixture will. Your vehicle's coolant
warning system is set for the proper coolant
mixture. With plain water or the wrong mixture,
your engine could get too hot but you wouldn't
get the overheat warning. Your engine could
catch fire and you or others could be burned.
Use a 50/50 mixture of clean, drinkable water
R
-
and DEX COOL coolant.
NOTICE:
In cold weather, water can freeze and crack the
engine, radiator, heater core and other parts.
So use the recommended coolant.
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.
Turn the pressure cap slowly counterclockwise (left)
-
about one quarter turn and then stop.
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.
1. You can remove
the coolant surge
tank pressure cap
when the cooling
system, including
the coolant surge
tank pressure
cap and upper
radiator hose, is
no longer hot.
5-15