1993 GMC Safari Owner's Manual - Page 218

A Adding only plain water to your cooling system be can dangerous. Plain water, or someotherliquidlikealcohol,canboilbeforethe proper coolant mixwill. Your vehicle'scoolantwarningsystem is set for the proper coolant mix.With plain water or thewrongmix,your enginecouldget too hotbutyouwouldn'tgettheoverheatwarning. ' Yourengine couldcatchfireandyou or otherscouldbeburned. Use a 50/50 mixof cleanwater andaproperantifreeze. I I In cold weather,water canfreezeandcracktheengine,radiator,he? coreandotherparts.Usetherecommendedcoolant PO408 I I; You canbeburned if youspillcoolantonhotengineparts.Coolant containsethyleneglycoland it willburn if theenginepartsarehot enough. spill Don't coolanta engine. on hot in thecoolantrecoverytank Whenthecoolant your vehicle. is at or above FULL, start 5-1 2