Pontiac 1999 Montana Owner's Manual page 330

United States
If this light comes on and stays on, it means you're low
on engine coolant.
Adding Coolant
If you need more coolant, add the proper DEX
coolant mixture at the coolant recovery tank.
6-24
Turning the radiator pressure cap when the
engine and radiator are hot can allow steam and
scalding liquids to blow out and burn you badly.
With the coolant recovery tank, you will almost
Canada
never have to add coolant at the radiator. Never
turn the radiator pressure cap
little
Add coolant mixture at the recovery tank, but be careful
R
-
COOL
not to spill it.
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.
CAUTION:
--
when the engine and radiator are hot.
CAUTION:
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--
even a