2011 Chevrolet Avalanche Owner's Manual - Page 45

Keys, Doors and Windows 2-9 Doors Midgate ® WARNING (Continued) that brings in outside air. This will force outside air into your vehicle. See Dual Automatic Climate Control System on page 8‑4. . { WARNING It can be dangerous to drive with the cargo area covered and the tailgate and the Midgate® open because carbon monoxide (CO) gas can come into your vehicle. You can not see or smell CO. It can cause unconsciousness and even death. If you must drive with the cargo covers on and the tailgate and Midgate open or if electrical wiring or other cable connections must pass through the seal between the body and the Midgate: . Open the rear doors to access the security locks on the inside edge of each door. To set the locks, insert a key into the slot and turn it to the horizontal position. The door can only be opened from the outside with the door unlocked. To return the door to normal operation, turn the slot to the vertical position. If you have air outlets on or under the instrument panel, open them all the way. See Engine Exhaust on page 9‑37. Midgate Operation This vehicle is equipped with a Midgate and a removable rear glass panel. The Midgate allows you to extend the length of the vehicle's cargo area. Make sure all windows are shut. Turn the fan on your heating or cooling system to its highest speed on the setting (Continued) .