Chevrolet 2004 Express Van Owner's Manual page 280

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 COLD FILL mark, add a 50/50 mixture of
clean, drinkable water and DEX-COOL
at the coolant recovery tank. See Engine Coolant on
page 5-22 for more information.
CAUTION:
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Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can boil
before the proper coolant mixture will. Your
vehicle's coolant warning system is set for the
proper coolant mixture. With plain water or the
wrong mixture, your engine could get too hot
but you would not get the overheat warning.
Your engine could catch fire and you or others
could be burned. Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
5-30
®
engine coolant
®
coolant.
Notice: Filling the engine cooling system of a V8
engine only through the radiator neck and engine
coolant overflow reservior after the engine coolant
has been drained may cause too little engine
coolant to be added. Although the coolant level may
appear full in the radiator neck, it may be as much
as 4 to 6 quarts (3.8 to 5.7 L) low. Always fill the
engine cooling system throught the upper radiator
hose. See your dealer for more information.