Avalanche 4WD V8-5.3L (2011)
1. Remove the interior trim. Refer to Rear Upper Garnish Molding Replacement in SI.
2. Partially remove the upper window weatherstrip. Begin at the center joint and pull the weatherstrip down to the weatherstrip push pin (1).
3. Using duck bill vise grips, bend the flange toward the inside of the vehicle. Start the procedure at the midgate upper glass latch area and work
outward and down to the weatherstrip push pin (1).
4. Reinstall the weatherstrip and ensure that the weatherstrip is fully seated on the flange.
5. After the weatherstrip is reinstalled, crimp the full length of the weatherstrip with the duck bill vise grips to ensure a weather tight seal (1).
3. If the seal is still not adequate, use the following procedure to adjust the tonneau or cargo cover.
1. Remove the tonneau or cargo cover panels. Move the number one tonneau or cargo cover mount 3 mm forward on the water leak side (1).
2. Install the tonneau or cargo cover panels and inspect for proper fit. All of the tonneau or cargo cover panels may need to be re aligned after the
number one panel repositioning.
4. Refer to Waterleak Test Preparation in SI to determine that the source of the leak has been properly diagnosed and corrected.
Warranty Information
