Pontiac Sunbird Owner's Manual page 172

How to Add Coolant to the Coolant
Recovery Tank (or the Coolant Surge
T a n k ) :
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 recovery
tank
(or coolant surge t a n k ) . If you have the
coolant surge
tank,
be sure the cooling
system, including the coolant surge t a n k
pressure cap, is cool before you do it.
See How to Add Coolant to the 2.0L L4
Engine at the Remostat Housing or
How to Add Coolant to the 3.Z
Vt
Engine at the Coolant Surge Tank later
in this section.
A
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 a proper
In cold weather, water can freeze
; :
and crack the engine, radiator,
:
heater core and other parts. Use
.:
:
the recommended coolant.
antifreeze.
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I . .