Pontiac 1997 Bonneville Owner's Manual page 233

How to Add
Coolant
to
the Coolant
Recovery Tank
If you
haven't found a problem yet,
but the coolant level
isn't at the FULL COLD mark, add a 50/50
mixture
of
clean water (preferably distilled) and DEX-COOL@
(silicate-free) antifreeze at the coolant recovery tank.
(See
"Engine Coolant" in
the
Index for more information.)
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 50/58
mix of clean water and DEX-COOL@
coolant.
r---
Adding only plain water to your cooling system
1
c
NOTICE:
can be dangerous. Plain water, or some o'ther
liquid like alcohol, can boil
before the
proper
coolant mix will. Your vehicle's coolant warning
system is set for the proper coolant mix,
In cold weather, water can freeze and crack the
engine, radiator, heater core and other parts.
Use the recommended coolant and the proper
coolant mix.
CAUTION: (Continued)
5-20