Roof Outer Panel Replacement TrailBlazer, Envoy

Caution: Refer to Approved Equipment for Collision Repair Caution in the Preface section.

1. Remove all of the related panels and components.
2. Restore as much of the damage as possible to the factory specifications.
3. Note the location and remove the following as necessary:

•	The sealers

•	The sound deadeners

•	The anti-corrosion materials





Important: Do not damage any inner panels or reinforcements. Drill through the roof panel only.

4. Locate and drill out all factory welds. Note the number and location of welds for installation of the service part.



5. Remove the damaged roof panel.

Important: In any area with excessive damage, space the plug weld holes every 40 mm (1½ in) apart.

1. Drill 8 mm (5/16 in) plug weld holes in the service part as necessary in the locations noted from the original panel.



2. Prepare all of the mating surfaces as necessary.
3. Apply GM-approved Weld-Thru Coating or equivalent to all mating surfaces. Refer to Anti-Corrosion Treatment and Repair .
4. Position the roof panel.



5. Plug weld accordingly.



6. Clean and prepare all of the welded surfaces.
7. Apply the following as necessary:

•	The sound deadening materials

•	An approved anti-corrosion primer

•	The sealers and refinish as necessary

8. Install all of the related panels and components.