1996 GMC Yukon Owner's Manual - Page 70

Your Doors and How They Work Side Doors To open the door from the outside, pull the handle up and pull the door open. To open the door from the inside, pull the lever toward you and push the door open. It canbe 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 or smell CO. It can cause unconsciousness andeven death. CAUTION: (Continued) 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 tailgateglass, tailgate or rear doors: Make sure all windows are shut. "urn 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 instrument panel, open themall the way. See "Engine Exhaust" in the Index. 2-6