1998 Chevrolet Prizm Owner's Manual - Page 249

Engine Coolant The following explains your cooling system and how If to add coolant when it is low. you have a problem with engine overheating,see "Engine Overheating"in the Index. What to Use Use a mixture of one-half clean water (preferably distilled) and one-half coolant that meets GM Specification 1825-M, which won't damage aluminum parts. You can also usea recycled coolant conforming to GM Specification 1825-M with a complete coolant flush and refill. you use this mixture, youdon't If need to add anything else. A 50/50 mixture of water and the proper coolant will: Give freezing protection down to -34°F (-37°C). Give boiling protection up to 265°F (129°C). Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. I C ION: Adding onlyplain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol,can boil beforethe proper coolant mixture will. Your vehicle'scoolant warning system isset for the proper coolant mixture. With plain water or the wrong mixture, your engine could get too hot you wouldn't but get the overheat warning. Your engine could catch fire and you or others could beburned. Use a 50/50 mixture of clean water and the proper coolant. 6-23