1998 GMC Suburban Owner's Manual - Page 87

Tailgate Glass and Tailgate I f your vehicle has a tailgate. you must raise the rear glass before lowering the tailgate. It can be dangerous to drive with the tailgate glass, tailgate or rear doors open because carbon monoxide (CO) gas can come into your vehicle. You can't see o r smell CO. It can cause unconsciousness and even death. If you must drive with the tailgate glass, tailgate or rear doors open or electrical wiring or other if cable connections must pass through the seal between the body and the tailgate glass, tailgate or reardoors: Make sure all windows are shut. @ Turn the fan on your heating or cooling system to its highest speed with the setting on VENT. That will force outside air into your vehicle. See "Comfort Controls" in the Index. If you have air outlets on or under the instrunlent panel, open them all the way. See "Engine Exhaust" in the Index. To open the glass from the outside. use your key. With the key i n the lock. turn the key to the right t o release the glass, then lift it up. To release the glass fro111 the inside, use the electric tailgate glass release switch on the instrument panel. For more information, see "'Tailgate -- Electric Glass Release" i n the Index. Close the tailgate before closing the rear glass. After closing the tailgate. make sure the tailgate is securely latched by pulling it toward you. After closing the rear cc "lass. pull up on its handle to make sure it is locked. Panel Doors To open the rear panel doors, YOLI must open the passenger's side door first. I f the door is locked, insert your door key i n the lock and turn it to the left to unlock it. To open the passenger's side door, pull up on the handle and pull the door open. 2-9