For 1990-2009 cars

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.

#### Tools Required

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

• | J 25070 Heat Gun

1. Remove the rear window defogger fuse.
2. Prepare the area to be repaired. Complete the following steps:

• | Buff the grid line (1) to approximately 6.0 mm (0.25 in) beyond each side of the break using fine steel wool.

• | Clean the area using an alcohol-dampened cloth.

3. Perform 1 of the following procedures:

• | Install a grid line repair decal.

• | Install 2 strips of tape.

- | Position 1 strip above the repair area.

- | Position 1 strip below the repair area.

4. Use the repair decal (1) or tape strips in order to control the width of the repair:

• | If you use a decal, ensure that the die-cut metering slot is the same width as the grid line.

• | If you use the tape strips, space the strips the width of the grid line apart.

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

Important: Protect the trim from heat damage.

9. Using the J 25070 , 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 2-3 minutes.

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

12.1. | If the grid line appears discolored, apply a tincture of iodine to the grid line using a pipe cleaner or a fine brush.

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

12.3. | Clean any excess iodine using a lint free cloth.

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