Tools Required

J 25070 Heat Gun

Caution: To avoid personal injury:

•	Do not allow the repair material to come in contact with skin or eyes and avoid breathing vapors.

•	Do not use near sparks or open flame.

Important: The rear defogger repair kit GM P/N 12346001 includes all of the materials that are needed for grid line repair of the rear-window defogger. You may also use an equivalent repair material.

1. Disconnect the battery feed wire of the rear-window defogger.
2. Inspect the rear-window defogger grid lines for breaks.
3. Use a wax pencil or a crayon in order to mark grid line breaks on the outside of the window.
4. Perform the following steps in order to clean the grid line area that you intend to repair:

4.1.	Buff the area using steel wool.

4.2.	Use a cloth that is dampened with denatured alcohol in order to wipe the area clean. Do not use materials beyond the expiration date.

4.3.	Buff and clean the area about 6 mm (0.25 in) beyond each side of the break in the grid line.





Important: 

•	Use the repair decal or the tape in order to control the width of the repair area.

•	If you use a decal, the die-cut metering slot must be the same width as the grid line.

5. Install one of the following items:

•	A grid line repair decal (2)

•	2 pieces of tape - 1 that is positioned above the repair area and 1 that is positioned below the repair area

6. Mix the grid repair material. Mix the material until the material is a silver color.
7. Verify that the window is at room temperature. Apply the grid repair material (1) to the repair area, using a small plastic paddle (3) or the equivalent.
8. Carefully remove the decal or the tape.




Notice: The grid line repair material must be cured with heat. To avoid heat damage to the interior trim, protect the trim near the repair area where heat is to be applied.

9. Using a J 25070 , apply heat to the repair area for 2-3 minutes under the following conditions:

•	Hold the heat gun nozzle 25 mm (1 in) from the surface.

•	A minimum temperature of 50°C (200°F) is required.

10. Inspect the grid line repair area. If a discoloration in the repair appears, apply a coating of tincture of iodine to the repair area using a pipe cleaner or a fine brush.

Allow the iodine to dry for about 30 seconds.

Carefully wipe off the excess iodine with a lint-free cloth.

Caution: At least 24 hours are required for complete curing of repair material. The repair area should not be physically distrubed until after that time. Insufficient curing of urethane adhesive may allow unrestrained occupants to be ejected from the vehicle resulting in personal injury.

11. Test the defogger operation in order to verify the grid line repair.