1993 Chevrolet Lumina Owner's Manual - Page 213

Engine Coolant The following explains your cooling system and how to add coolantwhen it is low. If you have a problem with engine overheating or you need to add if coolant to your radiator, see the Index under Engine Overheating. The proper coolantfor you1 _et will: Give freezingprotection c, .m to -34°F (-37°C). Give boilingprotection up to 262°F (128°C). Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights work they as should. What to Use: Use a mixture of one-half clean water (preferably distilled) and one-half antifreeze that meets "GM Specification 1825-M," which won't damage ~ ~ ~ aluminum parts. You can also use a recycled coolant conformingto GM Specification 1825-M with a complete coolant flushand refill. If you use this mixture, you don't need to add anything else. How to Check The proper fluid should added if the be level doesnot reach the bottom of the diaphragm whenit's in place in the reservoir. See the instructions on the reservoir cap. I 9 Adding only plain water to your cooling system can be dangerous. Plainwater, or some other liquid like alcohol, boil can before the proper coolantmix will. Your vehicle's coolant warning system isset for the proper coolant mix. With plain water or the wrong mix, your engine could get hot too but you wouldn't getthe overheat warning. Your engine could catch fire andyou or others could be burned. Use a 50/50 mix of clean water and a proper antifreeze. ,