Chevrolet 1997 Cavalier Owner's Manual page 268

What to Use
Use a mixture of one-half
clean water
(preferably
distilled) and one-half DEX-COOL@ coolant which
won't damage aluminum parts. Use GM Engine
Coolant If you use this mixture, you don't need to add
anything else.
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 mix will. Your vehicle's coolant warning
system is set for the proper coolant mix. With
plain water or the wrong mix, 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 mix of clean
water and DEX-COOL@ coolant.
NOTICE:
If you use an improper coolant mix, your engine
could overheat and be badly damaged. The
repair cost wouldn't be
covered
by your
warranty. Too much water in the mix can freeze
and crack the engine, radiator, heater core and
other parts.
[f you have to add coolant more than four times a year,
lave your dealer check your cooling system.
NOTICE:
If you use the proper coolant, you don't have to
add extra inhibitors or additives which claim to
improve the system. These can be harmful.