1993 Chevrolet S10 Pickup Owner's Manual - Page 273

Adding Coolant KO625 To CheckCoolant:Whenyourengine is cold,thecoolantlevelshouldbeat ADD, ora little higher.Whenyourengine is warm, thelevelshouldbe up to FULL HOT, ora little higher. To Add Coolant: If youneedmorecoolant,addthepropermixatthe coolantrecoverytank. A Turningtheradiatorpressurecapwhentheengineandradiatorare hotcanallowsteamandscaldingliquids to blowoutandburnyou badly.With thecoolantrecoverytank,youwillalmostneverhaveto addcoolantattheradiator. Never turn theradiatorpressure cap-evenalittle-when theengineandradiatorarehot. Add coolantmixattherecoverytank,butbecarefulnottospillit. A You canbeburned if youspillcoolantonhotengineparts.Coolant containsethyleneglycol,and it willburn if theenginepartsarehot enough.Don'tspillcoolantonahotengine. 6-25