GMC 1993 Safari Owner's Manual page 265

1
CAUTION
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
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burned.
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Use
I
50/50 mix of clean water and a proper antifreeze.
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*
->\-
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1
NOTICE
Some conditions, such as air trapped in the cooling system, can affect the
coolant level in the radiator. Check the coolant level when the engine is cold
and follow the steps under "Adding Coolant'' for the proper way to add
coolant.
If you have to add coolant more than four times a year, have your dealer
check your cooling system.
1
NOTICE
I
If you use the proper coolant, you don't have to add extra inhibitor- x
additives which claim to improve the system. These can be harmfu'
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