Important: The quarter panel is attached to the structure with factory welds. Due to the unique manner in which the top of the quarter panel attaches to the vehicle, a special sectioning procedure has been developed for improved serviceability.

1. Remove all related panels and components including the rear window.
2. Visually inspect and restore as much of the damage as possible.
3. Remove the following as necessary:

•

Sealers

•	Sound deadeners

•	Anti-corrosion materials

4. Locate, mark and drill out all necessary factory welds. Note the number of welds for installation of the quarter panel service assembly.



5. Apply a strip of 25 mm (1 in) masking tape along the top edge of the quarter panel where it meets the roof.
6. Cut along the bottom of the masking tape and remove the quarter panel.
7. Leave a 25 mm (1 in) tab attached to the roof (1).
8. Bend the tab down slightly so that the service panel can fit properly.

Important: Do not remove bracket.

9. Remove factory air baffle material from baffle bracket.

1. Trim the upper mounting flange on the service assembly so that it can fit over the 25 mm (1 in) tab left from the original panel.
2. Drill 8 mm (5/16 in) weld holes on the service assembly, as necessary in the locations noted from the original assembly.
3. Drill four weld holes along the top edge of the new quarter panel for attachment to the 25 mm (1 in) tab.

Important: Ensure that the fuel filler neck is properly sealed when replacing the left quarter panel. Use GM P/N 12399117 between the quarter panel and fuel filler neck.

4. Prepare mating surfaces and position the new panel.
5. Check for proper fit.



6. Plug weld accordingly. Take care not to warp or distort the metal.
7. Apply air baffle material from inside the vehicle.
8. Use access hole above bracket location.
9. Clean and prepare welded surfaces.
10. Prime with two-part catalyzed primer.
11. Apply sealers and anti-corrosion materials as necessary.

Important: Prior to refinishing, refer to GM 4901MD-99 Refinish Manual for recommended products. Do not combine paint systems. Refer to paint manufacturer's recommendations.

12. Install all related panels and components.