Chevrolet 2007 Avalanche Owner's Manual page 106

To remove the rear glass do the following:
1. Fold the rear seats. See Rear Seat Operation
on page 18 for more information. The front
seats may have to be moved forward slightly
to allow the rear seats to fold completely.
Although the rear glass can be removed
without folding the rear seats, you will not be
able to access the rear glass storage
pocket. Be sure to fold the seats before
removing the rear glass.
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2. Squeeze and pull down the latch levers (A),
located near the upper corners of the rear
glass, to unlatch. Once unlatched, the
glass-catch release button (C) will catch the
rear glass and prevent it from falling forward.
3. While holding the rear glass in place, press
the glass-catch release button (C) and pull
the top of the rear glass toward you using the
grab handle(s) (B) located at the top of the
rear glass.