1993 GMC Sonoma Owner's Manual - Page 208

Your Driving and the Road i AM480042 Runyourengineonlyaslongasyoumust.Thissavesfuel.Whenyourun theengine,makeitgoalittlefasterthanjustidle.Thatis,pushthe acceleratorslightly.Thisuseslessfuelfortheheatthatyouget and itkeeps thebatterycharged. You willneed a well-chargedbattery to restartthevehicle,andpossiblyforsignalinglateronwithyourheadlights.Lettheheater runforawhile.Then,shuttheengineoffandclosethewindowalmostallthe way to preservetheheat.Starttheengineagainandrepeatthisonlywhen youfeelreallyuncomfortablefromthecold.But do itaslittleaspossible. Preservethefuelaslongasyoucan. To helpkeepwarm,you can get out of thevehicleanddosomefairlyvigorousexerciseseveryhalfhouror so untilhelpcomes. lf You're Stuck in Deep Snow Thismanualexplainshow to getthevehicleout damagingit.See"RockingYourVehicle"intheIndex. of deepsnowwithout Recreational Vehicle Towing (Four= Wheel Drive Only) If yourvehiclehas4-wheeldriveyoumaytow it behindanothervehicle providing,itdoesnothavetheoptionalelectronicshifttransfercase. 4-54