2001 GMC Sierra 1500 Pickup Owner's Manual - Page 87

Swing-Out Windows (Extended Cab) To open a rear swing-out window, flip the latch open and swing the glass out. Sliding Rear Window (If Equipped) To open the sliding rear window, unlock the latch lever by pushing the lever toward the passenger's side of the vehicle. Release the lever from the latch plate and slide the window toward the passenger's side of the vehicle. To close the window, slide the window toward the driver's side of the vehicle. The latch lever will automatically snap on to the latch plate. Try to open the window without releasing the latch lever to be sure the window is in the locked position. The latch will catch when the window is fully open and it will also hold it in the open position. 2-4