2009 Chevrolet Express Van Owner's Manual - Page 266

What to Use Use a 50/50 mixture of clean, drinkable water and DEX-COOL® coolant. If using this mixture, nothing else needs to be added. This mixture: { CAUTION: Adding only plain water to the cooling system can be dangerous. Plain water, or some other liquid such as alcohol, can boil before the proper coolant mixture will. The vehicle's coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, the engine could get too hot but you would not get the overheat warning. The engine could catch fire and you or others could be burned. Use a 50/50 mixture of clean, drinkable water and DEX-COOL® coolant. • Gives freezing protection down to −34°F (−37°C), outside temperature. • Gives boiling protection up to 265°F (129°C), engine temperature. • Protects against rust and corrosion. • Will not damage aluminum parts. • Helps keep the proper engine temperature. 5-26