1995 GMC Yukon Owner's Manual - Page 103

Engine Exhaust A CAUTION: Engine exhaust can kill. It contains the gas carbon monoxide (CO), which youcan't see or smell. It can cause unconsciousness and death. You might have exhaust coming inif: 0 Your exhaust system sounds strange or different, Your vehicle getsrusty underneath. 0 0 Your vehicle was damaged in a collision. Your vehicle wasdamaged when driving over high points on the road or over road debris, Repairs weren't done correctly. Your vehicle or exhaust system had been modified improperly. 0 If you ever suspect exhaust is coming into your vehicle: Drive it only with all the windows downto blow out any CO; and 0 Have your vehicle fixed immediately. 2-3 1