For 1990-2009 cars

### Repair Procedure

#### Tools Required

• | Rear Window Defogger Repair Kit GM P/N 12346001, or equivalent.

• | 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.

1. Remove the rear window defogger fuse.
2. Prep the area to be repaired:

• | Buff the grid line to about 6.0 mm (0.25 in) beyond each side of the break with fine steel wool.

• | Wipe the area clean using a cloth dampened with alcohol.

3. Install a grid line repair decal, or install two strips of tape one positioned above and one below the repair area

• | A repair decal, or tape strips (2), must be used to control width of repair.

• | If a decal is used, be sure the die-cut metering slot is the same width as the grid line.

• | If tape strips are used space them the width of the grid line apart.

4. Mix the grid line repair material per manufacturers instructions or until a uniform silver color appears.
5. Insure that the window is at room temperature, 22°C (72°F).
6. Apply the grid repair material (1) to the repair area using a small plastic paddle (3) (or equivalent).
7. Remove the decal or tape.

Important: Protect Trim From Heat Damage.

8. Using a heat gun apply heat to the repair area.

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

• | Use a minimum temperature of 50°C (200°F).

• | Apply heat for 2 to 3 minutes.

9. Replace the rear defogger fuse.
10. Test the defogger operation to verify the grid line is repaired.
11. Inspect the grid line repair for appearance.

11.1. | Apply tincture of iodine to the grid line using a pipe cleaner or a fine brush if the grid line appears discolored.

11.2. | Allow the iodine to dry for at least 30 seconds.

11.3. | Wipe off any excess iodine using a lint free cloth.

12. Allow the repair area to cure undisturbed for at least 24 hours.