2004 Chevrolet Aveo Owner's Manual - Page 209

Engine Coolant The following explains your cooling system and how to add coolant when it is low. If you have a problem with engine overheating, see Engine Overheating on page 5-25. A 50/50 mixture of clean, drinkable water and proper coolant will: {CAUTION: 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 the proper coolant. Notice: If you use an improper coolant mixture, your engine could overheat and be badly damaged. The repair cost would not be covered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times a year, have your dealer check your cooling system. Notice: If you use the proper coolant, you do not have to add extra inhibitors or additives which claim to improve the system. These can be harmful. 5-23 Give freezing protection down to −22°F (−30°C). Give boiling protection up to 268°F (131°C) Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. What to Use Use a 50/50 mixture of clean, drinkable water and coolant that meets GM Specification 1825M, which will not damage aluminum parts. You can also use a recycled coolant conforming to GM Specification 1825M with a complete coolant flush and refill. If you use this coolant mixture, you do not need to add anything else. For protection in extremely cold weather conditions, use a 40/60 mixture of clean, drinkable water and proper coolant.