GM Service Manual Online
For 1990-2009 cars only

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

    Object Number: 71186  Size: SH
  1. Remove the rear window defogger fuse.
  2. Prepare the area to be repaired. Complete the following steps:
  3. • 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.

    Object Number: 71187  Size: SH
  4. Perform 1 of the following procedures:
  5. • 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.
  6. Use the repair decal (1) or tape strips in order to control the width of the repair:
  7. • 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.
  8. Mix the grid line repair material per the manufacturers instructions or until a uniform silver color appears.
  9. Ensure that the window is at room temperature of 22°C (72°F).
  10. Apply the grid repair material to the repair area using a small plastic paddle or equivalent.
  11. Remove the decal or tape.

  12. Object Number: 71188  Size: SH

    Important: Protect the trim from heat damage.

  13. Using the J 25070 , apply heat to the repair area:
  14. • 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.
  15. Replace the rear defogger fuse.
  16. Test the defogger operation in order to verify that the grid line is repaired.
  17. Inspect the grid line repair for appearance.
  18. 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.
  19. Allow the repair area to cure undisturbed for at least 24 hours.