Pontiac 1993 Grand Am Owner's Manual page 183

Problems on the Road
Engine Overheating
(CONTJ
How to Add Coolant to the Coolant
Surge Tank:
If you haven't found a problem yet, but
the coolant level isn't at or above
FULL
COLD, add a
50/50
mixture of clean
water (preferably distilled) and a proper
antifreeze at the coolant surge t a n k , but
be sure the cooling system, including
the coolant surge
tank
pressure cap, is
cool before you do it. (See the Index
under Engine Coolant for more
information about the proper coolant
mix.)
1 8 2
L Steam and scalding liquids
L
from
a hot
cooling system can
blow out and burn you badly. They
are under pressure, and if
you
turn
cap-evm
a
little-they can come
out
at
high speed. Never turn
the
pressure cap when the cooliag
tank
pressure cap,
is hot. Wait for
the
cooling system and coolant
you
ever have to turn
the
pmsure
MP.
the coolant surge tank pressure
system,
including the
COoIant surge
surge
tank pressure cap
t o
cool if
Adding only plain water to
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 a proper
antifreeze.
k
your cooling system can be
I