1993 GMC Suburban Owner's Manual - Page 248

Phisvehiclehasaclutchedenginecoolingfan.Whentheclutchisengaged, thefanspinsfastertoprovidemoreairtocooltheengine.Inmosteveryday drivingconditionstheclutchisnotengaged.Thisimprovesfueleconomyand reducesfannoise.Underheavyvehicleloading,trailertowingandlorhigh outsidetemperatures,thefanspeedincreaseswhentheclutchengages. So youmayhearanincrease in fannoise.Thisisnormalandshouldnotbe mistakenasthetransmissionslippingormakingextrashifts.It is merelythe slow downwhenadditional coolingsystemfunctioningproperly.Thefanwill coolingisnotrequiredandtheclutchdisengages. You mayalsohearthisfannoisewhenyoustarttheengine. asthefanclutchdisengages. It willgoaway It'sunusualfor a tireto"blowout"whileyou'redriving,especiallyifyou maintainyourtiresproperly. If airgoesoutof atire,it'smuchmorelikelyto leakoutslowly.Butifyoushouldeverhavea"blowout,"hereareafewtips aboutwhattoexpectandwhattodo: If a front tire fails, the flat tire will create a drag that pulls the vehicle toward that side. Takeyourfoot off theacceleratorpedalandgripthesteeringwheel firmly.Steertomaintainlaneposition,thengentlybrake to astopwellout thetrafficlane. of A rearblowout,particularlyonacurve,actsmuchlikeaskidandmay requirethesamecorrectionyou'duse in a skid. In anyrearblowout,remove yourfootfromtheacceleratorpedal.Getthevehicleundercontrol by steering thewayyouwantthevehicle to go. It may beverybumpyandnoisy,but youcanstillsteer.Gentlybraketoastop,well off theroad if possible. If yourtiregoesflat,thenextpart shows how to use your jacking equipment to change a flat tire safely. Changing a Fiat Tjre If a tire goes flat, avoid further tire and wheel damage by driving slowly levelplace.Turn on yourhazardwarningflashers. to a