2004 GMC Envoy Owner's Manual - Page 393

Storing a Flat or Spare Tire and Tools {CAUTION: Storing a jack, a tire, or other equipment in the passenger compartment of the vehicle could cause injury. In a sudden stop or collision, loose equipment could strike someone. Store all these in the proper place. Notice: An aluminum wheel with a flat tire should always be stored under the vehicle with the hoist. However, storing it that way for an extended period could damage the wheel. To avoid this, always stow the wheel properly with the valve stem pointing up and have the wheel repaired as soon as possible. Follow this diagram to store the underbody-mounted spare. A. Wheel Wrench B. Hoist Shaft C. Extension(s) D. Retainer E. Spare or Flat Tire (Valve Stem Pointed Up) {CAUTION: The underbody-mounted spare tire needs to be stored with the valve stem pointing up. If the spare tire is stored with the valve stem pointing downward, its secondary latch won't work properly and the spare tire could loosen and suddenly fall from your vehicle. If this happened when your vehicle was being driven, the tire might contact a person or another vehicle, causing injury and, of course, damage to itself as well. Be sure the underbody-mounted spare tire is stored with its valve stem pointing up. 1. Put the tire on the ground at the rear of the vehicle, with the valve stem pointed up and to the rear. 2. Pull the retainer through the wheel. 3. Put the socket end of the extension, on an angle, through the hole in the rear bumper and into the hoist shaft. 5-85