1996 Chevrolet Suburban Owner's Manual - Page 71

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 betweenthe body and the tailgate glass, tailgate or rear doors: Make sure all windows are shut. Turn the fanon your heating or cooling system to its highest speed withthe setting on any function. Makesure the recirculation button is not pressed in. That will forceoutside air into your vehicle. See "Comfort Controls" in the Index. If you have air outlets on or under the instrumentpanel, open them all the way. See "EngineExhaust" in the Index. Tailgate Glass and Tailgate If your vehicle has a tailgate, you must raise the rear glass before lowering the tailgate. To open the glass from the outside, use your door key. With the key in the lock, turn the key clockwise I to release the glass, then lift it up. ... To release the glass from the inside, use the electric tailgate glass release switch on the instrument panel. For more information, see "FdilgateElectric Glass Release" in the Index. 2-4