1995 Pontiac Firebird Owner's Manual - Page 263

Engine Coolant The following explains your cooling system and how to add coolant whenit is low. If you have a problem with engine overheating or if you need to add coolant your to radiator, see"Engine Overheating" in the Index. The proper coolant for your Pontiac will: Give freezing protection down to-34°F (-37 C). O Give boiling protectionup to 262 "F ( 128" C). Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights work as they 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 damagealuminum parts. You can also use a recycled coolant conforming to GM Specification 1825-M with acomplete coolant flush and refill.If you use this mixture, you don't need add to anything else. NOTICE: If you usean improper coolantmix, your engine could overheat and be badly damaged. The repair cost wouldn't be covered by your warranty. Too much waterin the mix can freeze and crack the engine, radiator, heater core and other parts. I 6-30