1993 GMC Suburban Owner's Manual - Page 293

I you as% the proper coolant, you don? have to add extra inhibitors f additives which claim to irnpmve the system. These can be harnfui. or ... ...'...I . . : ...*k.,. .-' t PO206 To Check Coolant: Whenyourengine is cold, the coolant level should be at COLD, or a little higher.Whenyourengine is warm,the level shouldbe up to HOT, ora little higher. To Add Coolant: If you need morecoolant,add the proper mix at the coolant recovery tank. Turningtheradiatorpressurecapwhentheengine and radiatorare hot can allowsteam and scaldingliquidsto blow out and burn you badly.Withthecoolantrecoverytank, you will almostneverhave to add coolantat the radiator.Never turn theradiatorpressure cap-even alittle-whentheengineandradiatorare hot. Addcoolantmixattherecoverytank,but be carefulnot to spill it. You can be burned if you spill coolant on hot engineparts.Coolant containsethyleneglycol, and it willburn if theenginepartsarehot enough.Don'tspillcoolant on a hot engine. 6-27