1996 Pontiac Sunfire Owner's Manual - Page 246

NOTICE: When adding coolant it important thatyou use is DEX-COOL Rul (orange-colored, silicate-free) coolant meetingGM Specification 6277M. If silicated coolant is added to the system, premature engine, heater coreor radiator corrosion may result.In addition, the engine coolant will require change sooner a t 30,000 miles (50 000 km) or24 months whichever occurs first. A CAUTION: -- What to Use Use a mixtureof one-half clean water (preferably distilled) and one-half DEX-COOL (orange-colored, silicate-free) antifreeze that meets GM Specification 6277M, which won't damage aluminum parts. Use GM Engine Coolant Supplement (sealer) (GM Part No. 3634621) with any complete coolant change. If you use this mixture, you don't needto add anything else. Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can boil before the proper coolant mix will. Your vehicle's coolant warning system is set for the proper coolant With mix. plain water or the wrong your enginecould mix, get too hot but you wouldn't get the overheat warning. Your engine could catch fire and or you others could be burned. Use a 50/50 mix of clean wa*er and DEX-COOL (orange-cQlQreQ, silicate-free) antifreeze. TM 6-23