GM Service Manual Online
For 1990-2009 cars only

Fan Clutch Replacement Diesel

Special Tools

J 41240-5A Fan Clutch Wrench

Removal Procedure

  1. Remove the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement.

  2. Object Number: 1674565  Size: SH
  3. Remove the 3 engine cooling fan shroud bolts (1).

  4. Object Number: 1674593  Size: SH
  5. Position the engine cooling fan shroud (1) forward to the radiator.

  6. Object Number: 1674552  Size: SH
  7. Install a long pin bar into the fan hub (1).
  8. Use a J 41240-5A to remove the fan hub nut (2) from the hub in a counterclockwise rotation.
  9. Remove the fan and the engine cooling fan shroud as an assembly.

  10. Object Number: 367006  Size: SH
  11. Remove the fan clutch bolts from the rear of the fan blade.
  12. Separate the fan clutch from the fan blade.

Installation Procedure

Warning: Do not use or attempt to repair a damaged cooling fan assembly. Replace damaged fans with new assemblies. An unbalanced cooling fan could fly apart causing personal injury and property damage.


    Object Number: 721992  Size: SH
  1. Install the fan clutch onto the fan blade.
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the fan clutch bolts.
  4. Tighten
    Tighten the bolts to 23 N·m (17 lb ft).

  5. Install the fan and engine cooling fan shroud assembly to the fan hub.

  6. Object Number: 1674552  Size: SH
  7. Use a J 41240-5A on the fan clutch hub nut (2) to install a long pry bar to the fan clutch hub (1).
  8. Tighten
    Tighten the nut clockwise to 56 N·m (41 lb ft).


    Object Number: 1674565  Size: SH
  9. Position the engine cooling fan shroud on the 3 mounting brackets (1).
  10. Install the bolts. Loosely tighten the top mounting bolt at the oil filler neck.

  11. Object Number: 1674558  Size: SH

    Note: Maintain a 6 mm (0.25 in) minimum clearance at all 3 places.

  12. Center the engine cooling fan shroud to the fan blade in 3 places (1).

  13. Object Number: 1989946  Size: SH

    Note: Improper installation could cause damage to the fan and shroud while vehicle is in service.

  14. Make sure the orientation of the cooling fan shroud (1) and rubber seal (2) are installed correctly

  15. Object Number: 1674565  Size: SH
  16. Fully tighten the 3 engine cooling fan shroud bolts (1).
  17. Tighten
    Tighten the bolts to 8 N·m (71 lb in).

  18. Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement.