1999 GMC Sierra 1500 Pickup Owner's Manual - Page 255
1999 GMC Sierra 1500 Pickup Manual
Page 255 highlights
antifreezeatthecoolantrecoverytank.(See"Coolant" informationaboutthepropercoolantmix.) in theIndexformore * Addingonly plain water to yourcoolingsystemcanbedangerous. Plainwater,orsomeotherliquid like alcohol,canboilbeforethe propercoolant mixwill.Your vehicle'scoolantwarningsystemis forthepropercoolantmix.With plain waterorthewrongmix,your engine could gettoohotbutyouwouldn'tgettheoverheatwarning, Your enginecouldcatchfireandyouorotherscouldbeburned. 7 50/50 mixof cleanwater andaproperantifreeze. USE I ln cold weather,watercanfreezeandcracktheengine,radiator,heater :ore andotherparts.Usetherecommendedcoolant. PO206 I * You canbeburned A containsethyleneglycoland if youspillcoolantonhotengineparts. CoolQni it willburn if theengine parts are hut enough.Don'tspillcoolantonahotengine. Whenthecoolantinthecoolantrecovery vehicle. is at or above COLD, startyour 5-1 3