1998 GMC Savana Van Owner's Manual - Page 101

Parking Over Things That Burn Engine Exhaust Engine exhaust can kill. It contains the gas carbon monoxide (CO), which you can't seeor smell. It can cause unconsciousnessand death. You might have exhaust coming in if: Your exhaust system sounds strange or different. Your vehicle gets rusty underneath. 0 Your vehicle was damaged in collision. a Your vehicle was damaged when driving over high points on the road over road debris. or 0 Repairs weren't done correctly. 0 Your vehicle or exhaust system had been modified improperly. If you ever suspectexhaust is cominginto your vehicle: 0 Drive it only with allthe windows downto blow out any CO; and Have your vehicle fixed immediately. 2-29