GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 178867  Size: SH
  1. Remove the bolts and nuts that secure the clips, brackets and cooler lines to the frame rail (P42 with I-Beam Suspension).

  2. Object Number: 178868  Size: SH
  3. Remove the bolts and nuts that secure the clips, brackets and cooler lines to the frame rail (P42 without I-Beam Suspension).

  4. Object Number: 178869  Size: SH
  5. Remove the bolts and nuts that secure the clips, brackets and cooler lines to the frame rail (P42 with Auxiliary Cooler).

  6. Object Number: 178891  Size: SH
  7. Remove the bolts and nuts that secure the clips, brackets and cooler lines to the frame rail (P32 with Auxiliary Cooler).

  8. Object Number: 178896  Size: SH
  9. Remove the bolts and nuts that secure the clips, brackets and cooler lines to the frame rail.

  10. Object Number: 178870  Size: SH
  11. Remove the bolts and nuts that secure the clips, brackets and cooler lines to the frame rail (6.5L Turbo Diesel with Auxiliary Cooler).

  12. Object Number: 178883  Size: SH
  13. Remove the two retaining clips that secure the two transmission cooler lines to the transmission.
  14. Discard the two retaining clips.

  15. Object Number: 178893  Size: SH
  16. Remove the two nuts that secure the two cooler lines to the radiator (P32 with Auxiliary Cooler).

  17. Object Number: 178889  Size: SH
  18. Remove the two nuts that secure the two cooler lines to the radiator (P32 without Auxiliary Cooler).

  19. Object Number: 178872  Size: SH
  20. Remove the two nuts that secure the two cooler lines to the auxiliary oil cooler, if equipped 6.5L Turbo Diesel).

  21. Object Number: 178871  Size: SH
  22. Remove the two nuts that secure the two cooler lines to the auxiliary oil cooler, if equipped (6.5L Diesel with HVAC System).

  23. Object Number: 178866  Size: SH
  24. Remove the two nuts that secure the two cooler lines to the auxiliary oil cooler, if equipped (6.5L Diesel without HVAC System).
  25. Remove the nuts and clips that secure the auxiliary oil cooler to the radiator support, if equipped.

Installation Procedure


    Object Number: 178872  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 bolts, nuts, and clips that secure the auxiliary oil cooler to the radiator support, if equipped (6.5L Turbo Diesel).
  2. Tighten
    Tighten the bolts and nuts that secure the auxiliary oil cooler to the radiator support to 10 N·m (89 lb in).


    Object Number: 178871  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.

  3. Install the bolts, nuts, and clips that secure the auxiliary oil cooler to the radiator support, if equipped (6.5L Diesel with HVAC System).
  4. Tighten
    Tighten the bolts and nuts that secure the auxiliary oil cooler to the radiator support to 10 N·m (89 lb in).


    Object Number: 178866  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.

  5. Install the bolts, nuts, and clips that secure the auxiliary oil cooler to the radiator support, if equipped (6.5L Diesel without HVAC System).
  6. Tighten
    Tighten the bolts and nuts that secure the auxiliary oil cooler to the radiator support to 10 N·m (89 lb in).

  7. Install the two nuts that secure the oil cooler lines at the transmission oil cooler, if equipped.
  8. Tighten
    Tighten the nuts that secure the oil cooler lines to the transmission oil cooler to 27 N·m (20 lb ft).


    Object Number: 178893  Size: SH
  9. Install the two nuts that secure the two cooler lines to the radiator (P32 with Auxiliary Cooler).
  10. Tighten
    Tighten the nuts that secure the oil cooler lines to the radiator to 27 N·m (20 lb ft).


    Object Number: 178889  Size: SH
  11. Install the two nuts that secure the two oil cooler lines to the radiator (P32 without Auxiliary Cooler).
  12. Tighten
    Tighten the nuts that secure the oil cooler lines to the radiator to 27 N·m (20 lb ft).


    Object Number: 178883  Size: SH

    Important: Do not reuse the existing retaining clips that were removed from the transmission cooler line fittings. The two retaining clips that are to be installed into the new transmission fittings must be new.

  13. Install two NEW retaining clips onto the transmission.
  14. Push the two cooler lines into the two transmission fittings until the cooler lines lock into place:
  15. 8.1. Lightly pull on the cooler line, away from the fitting, to ensure that the cooler line is locked into the fitting.
    8.2. Position the plastic cap located on the cooler line onto the fitting hex.

    Object Number: 178867  Size: SH
  16. Install the bolts and nuts that secure the clips to the frame rail (P32 with I-Beam Suspension).
  17. Tighten
    Tighten the bolts and nuts that secure the clips to the frame rail to 8 N·m (71 lb in).


    Object Number: 178868  Size: SH
  18. Install the bolts and nuts that secure the clips to the frame rail (P42 without I-Beam Suspension).
  19. Tighten
    Tighten the bolts and nuts that secure the clips to the frame rail to 8 N·m (71 lb in).


    Object Number: 178869  Size: SH
  20. Install the bolts and nuts that secure the clips to the frame rail (P42 with Auxiliary Cooler).
  21. Tighten
    Tighten the bolts and nuts that secure the clips to the frame rail to 8 N·m (71 lb in).


    Object Number: 178891  Size: SH
  22. Install the bolts and nuts that secure the clips to the frame rail (P32 with Auxiliary Cooler).
  23. Tighten
    Tighten the bolts and nuts that secure the clips to the frame rail to 8 N·m (71 lb in).


    Object Number: 178896  Size: SH
  24. Install the bolts and nuts that secure the clips to the frame rail (P32 without Auxiliary Cooler).
  25. Tighten
    Tighten the bolts and nuts that secure the clips to the frame rail to 8 N·m (71 lb in).


    Object Number: 178870  Size: SH
  26. Install the bolts and nuts that secure the clips to the frame rail (6.5L Turbo Diesel with Auxiliary Cooler).
  27. Tighten
    Tighten the bolts and nuts that secure the clips to the frame rail to 8 N·m (71 lb in).

  28. Install the bolts and nuts that secure the transmission cooler lines to the frame rail.
  29. Tighten
    Tighten the bolts and nuts that secure the transmission cooler lines to the frame rail to 12 N·m (9 lb ft).