GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 1999 🢒 S/T Isuzu - 2WD 🢒 Engine 🢒 Engine Cooling 🢒 Fan Clutch Replacement

Removal Procedure

Tools Required

J 41240 Fan Clutch Wrench

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

    2. Important: To maintain a balanced fan assembly, align the yellow paint mark on the fan clutch hub with the yellow paint mark on the water pump hub.


    Object Number: 42910 Size: SH
  2. Remove the fan clutch from the coolant pump using J 41240 .
    3. 2.1. Install J 41240-1 into the water pump access holes.
    2.2. With J 41240-2 secure on the fan clutch nut, hold J 41240-1 firmly in place while turning J 41240-2 counter-clockwise.
  3. Remove the fan and the fan clutch as an assembly.

    4. Object Number: 42877 Size: SH
  4. Remove the fan-to-fan clutch mounting screws (2.2L, RWD w/ A/C).

    5. Object Number: 42875 Size: SH
  5. Remove the fan-to-fan clutch mounting screws (2.2L, RWD w/o A/C).

    6. Object Number: 344761 Size: SH
  6. Remove the fan-to-fan clutch mounting screws (4.3L w/ A/C).

    7. Object Number: 344758 Size: SH
  7. Remove the fan-to-fan clutch mounting screws (4.3L w/o A/C).
  8. Remove the fan from the clutch.

Installation Procedure

    Object Number: 42877 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the fan to the fan clutch mounting screws (2.2L w/ A/C).

    2. Tighten
    Tighten the screws to 33 N·m (24 lb ft).


    Object Number: 42875 Size: SH
  2. Install the fan to the fan clutch mounting screws (2.2L w/o AC).

    3. Tighten
    Tighten the screws to 33 N·m (24 lb ft).


    Object Number: 344761 Size: SH
  3. Install the fan-to-fan clutch mounting screws (4.3L w/AC).

    4. Tighten
    Tighten the screws to 33 N·m (24 lb ft).


    Object Number: 344758 Size: SH
  4. Install the fan-to-fan clutch mounting screws (4.3L w/o AC).

    5. Tighten
    Tighten the screws to 33 N·m (24 lb ft).


    Object Number: 42910 Size: SH
  5. Install the fan clutch to the coolant pump pulley using the J 41240 .
  6. Install the attaching nuts.
  7. Install the upper fan shroud. Refer to Fan Shroud Replacement .