1994 GMC Suburban Owner's Manual - Page 64

Tailgate Glass, Tailgate and Rear Doors A CAUTION: It can be dangerous to drive with the tailgate glass, tailgate,or rear doors open becausecarbon monoxide (CO) gas can come into your vehicle. You can't seeor smell CO. It can cause unconsciousness and even death. If you must drive with the tailgate glass, tailgate,or reardoors open, or if electrical wiringor other cable connections must pass through the seal between the body and the tailgate glass, tailgate, or rear doors f4!" i!: -7ii: :; $ i.i. i . : : : Make sure all windows are shut. Turn the fan on your heating or cooling systemto its highest speed withthe setting on VENT. That will force outsideair into your vehicle. See "Comfort Controls" in Index. the a If you haveair vents onor under the instrument panel, open them all the way. See "Engine Exhaust" in Index. the Tailgate Glass and Tailgate If your vehicle has a tailgate, you must raise the rear glass before lowering the tailgate. I To release the glass from the inside, use the electric tailgate glass release switch on the instrument panel. For more information, see ''TailgateElectric Glass Release" in the Index. 2-8