1997 Pontiac Firebird Owner's Manual - Page 275

NOTICE: I When adding coolant, is important thatyou it use only DEX-COOL@(silicate-free) c'oolant. If silicated coolant is added to system, the or premature engine, heater core radiator corrosion may result. In addition, the engine coolant will require change sooner at 30,000 miles (50 000 km) or 24 months, whichever occurs first, 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 mixwill. Your vehicle's coolant warning system is set for the proper coolant mix. With plain water or the wrong your engine could mix, get too hot but you wouldn't get the overheat warning. Your engine could catch fire and or you others could be burned. a 50J50 mix of clean Use water andDEX-COOL'coolant. -- What to Use Use a mixture of one-half ckan water (preferably distilled) and one-half DEX-COOL@coolant which won't damage aluminumparts. If you use this mixture, you don't need to add anything else. 6-30