1996 Cadillac Seville Owner's Manual - Page 242

I A CAUTION: I i , j 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 mix. With plain water or the wrong your engine could mix, get too hot but you wouldn't get the overheat you warning. Your engine could catch fire and or others could be burned. Use a 50150 mix of clean water and DEX-COOL antifreeze. R*l :?. " ,il 5-21