1998 Buick Park Avenue Owner's Manual - Page 256

_ _ _ ~_ _ ~ ~~ ___ __ __ In cold weather,water can freeze and crack the engine, radiator, heater core and other parts. Use the recommended cooisant and the proper coolant mixture. CAUTION: Adding only plain water to your cooling system can be dangerous. Plain water, OF some other liquid like alcohol,can boil before the proper coolant mixture will. Your vehicle's coolant warning system is set for the propercoolant mixture. With plain water or the wrong mixture, your engine could get too but you wouldn't hot get the overheat warning. Your engine could catch fire and or others could be burned. you Use a 50/50 mixture of clean water and DEX-COOL@coolant.