Service Procedure

1. Ensure that the rear rocker panel in the tape contact area (1) is clean and dry. Use a non oil based cleaner, preferably isopropyl alcohol. For Chevrolet TrailBlazer EXT with molded-in-color rear rocker, coat the top of the rocker with adhesion promoter, P/N 12378462 (U.S.), 10953554 (Canada), or equivalent and then allow it to dry.





2. With the door closed, trace the contour of the door using a china marker or grease pencil. Hold the taper of the marker to the door as shown.








3. Using the line from the china marker (4) as a guide and starting at the sill plate, install the seal along the rear rocker panel with seal bulb (2) toward the door. Flatten the bulb and align it to the china marker line pressing lightly.

4. Close the door and check for the gasket pushing out between the door and the body.





5. If the gasket was pushing out, realign the gasket in that area.

6. Trim the gasket so that it does not extend higher than the rocker panel (5) as necessary.

7. When the gasket is located, open the door and firmly press the gasket into place. A roller tool may be helpful in seating the gasket.

8. Check the door latch for proper operation:

8.1. Open the rear door.

8.2. Open the rear side closure.

8.3. Listen for two audible clicks while rotating the fork bolt from the full open to the fully latched position.

9. If two distinct audible clicks are NOT heard:

9.1. Replace the latch assembly.

9.2. Proceed to Step 11.

10. If two distinct audible clicks are heard:

10.1. Ensure that the fork bolt is in the fully latched position.

10.2. Blow out the latch in the area of the detent with compressed air.

11. Lubricate both sides of the detent pivot by spraying with GM Superlube for one second, and then cycle the latch open and closed several times to work the lubrication into the pivot.

12. Repeat Steps 1 through 11 for the rear door on the other side.