GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 29023 Thermo Element Height Gage


    Object Number: 25490  Size: SH
  1. Lay J 29023 on its side between the thermo element (411) and the case cover (401). Check the height of the thermo element spring pin (409) in the case cover.
  2. Specification
    Confirm that the pin height is 5.4 mm (0.213 in).

  3. Visually inspect the thermo element (412) for damage.

  4. Object Number: 25483  Size: SH

    Notice: Use a small piece of wood between the side cutters and the case cover, when removing the thermo element spring pin (409), to prevent damage to the case cover.

    Important: Do not disassemble the thermo element if the pin is the correct height and the visual inspection is satisfactory.

  5. Use side cutters under the thermo element spring pin (409) in order to pry the pin loose. Remove the pin and element from the case cover (401).

  6. Object Number: 20713  Size: SH
  7. Visually inspect the following thermo element components for damage:
  8. • The spring pins (409)
    • The pin (410)
    • The plate (411)
    • The thermo element (412)

    Object Number: 25484  Size: SH
  9. Using J 29023 held flush against the thermo element pin (410), inspect the height of the pin.

  10. Object Number: 25487  Size: SH
  11. If the pin height is too high, use a hammer in order to set the height of the thermo element pin (410).

  12. Object Number: 20717  Size: SH

    Notice: Use a small piece of wood between the side cutters and the case cover, when removing the thermo element pin (410), to prevent damage to the case cover.

  13. If the thermo element pin (410) is setting too low in the case cover (401), use side cutters under the pin in order to pry the pin up.

  14. Object Number: 25489  Size: SH
  15. Install the following parts:
  16. • The thermo element plate (411)
    • The thermo element (412)
    • Both of the thermo element spring pins (409)
  17. Lay J 29023 on its side between the thermo element (411) and the case cover (401) so that you can check the height of the thermo element spring pin (409).
  18. Use a hammer in order to set the height of the thermo element spring pin (409). Set the height of the pin to 5.4 mm (0.213 in).