GM Service Manual Online
For 1990-2009 cars only

Oil Cooler Hose/Pipe Replacement Front

Removal Procedure

Tools Required

J 41803 Engine Support Fixture


    Object Number: 71421  Size: SH
  1. Position the front wheels straight ahead, then lock the steering column.
  2. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    in General Information.
  3. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Have a drain pan ready to catch fluid.
  5. Disconnect the transmisson oil cooler (TOC) front upper pipe fitting from the radiator, then cap the hose fitting.

  6. Object Number: 71432  Size: SH
  7. Disconnect the TOC front lower pipe fitting from the radiator, then cap the hose fitting.
  8. Drain the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  9. Lower the vehicle and leave it on the hoist.
  10. Discharge the A/C system. Refer to Evacuation in HVAC Systems with A/C - Manual.
  11. Disconnect the A/C compressor hose and the A/C evaporator hose from the A/C condenser, then cap or plug the hoses. Refer to Condenser in HVAC Systems with A/C - Manual.

  12. Object Number: 173673  Size: SH
  13. Remove the air intake duct and the upper radiator support. Refer to Radiator Support Replacement in Engine Cooling.
  14. Disconnect the inlet and outlet radiator hose clamps from the radiator.
  15. Disconnect the inlet and outlet radiator hoses from the radiator.
  16. Remove the air cleaner housing and the air intake shroud. Refer to Air Filter Element and Air Cleaner Assembly in Engine Controls.
  17. Carefully pivot the A/C condenser and the radiator forward and tie off to support.

  18. Object Number: 70108  Size: SH
  19. Remove the intermediate shaft lower coupling shield.
  20. Remove the intermediate shaft lower coupling bolt.
  21. Disconnect the intermediate shaft lower coupling from the power steering (P/S) gear.

  22. Object Number: 65353  Size: SH
  23. Remove the P/S cooler retaining bolts.

  24. Object Number: 65352  Size: SH
  25. Remove the P/S gear mounting bolts and nuts.
  26. Release the P/S gear and cooler from the front suspension crossmember, then slave forward.
  27. Remove the A/C compressor bracket. Refer to Compressor in HVAC Systems with A/C - Manual.
  28. Remove the generator from the accessory mounting bracket. Refer to Generator Replacement in Engine Electrical.
  29. Install and support the engine with the J 41803 .
  30. Remove the RH engine mount (with bracket). Refer to Engine Mount Replacement in Engine Mechanical.

  31. Object Number: 71420  Size: SH
  32. Remove the TOC front pipe front clip.
  33. Raise the vehicle.

  34. Object Number: 71419  Size: SH
  35. Remove the TOC front pipe front retaining clamp bolt and retaining clamp.

  36. Object Number: 71418  Size: SH
  37. Remove the TOC front pipe rear retaining clamp bolt and retaining clamp.
  38. Disconnect the TOC front pipe fittings from the junction fittings at the engine flywheel housing.
  39. Lower the vehicle, leave it slightly above the ground.
  40. Finesse the TOC front pipes out of the vehicle (through the top).

Installation Procedure

Tools Required

J 41803 Engine Support Fixture


    Object Number: 71418  Size: SH
  1. Install the transmission oil cooler (TOC) front pipes to the vehicle (through the top).
  2. Finesse the pipes into position.

  3. Raise the vehicle.
  4. HAND-START and HAND-TIGHTEN the TOC front upper and lower pipe fittings to the junction fittings at the engine flywheel housing.
  5. Tighten
    Tighten the transmission oil cooler front upper and lower pipe fittings at the junction to 27 N·m (20 lb ft).

    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.

  6. Install the TOC front pipe rear retaining clamp and bolt.
  7. Tighten
    Tighten the transmission oil cooler front pipe rear retaining clamp bolt to 2.2 N·m (19 lb in).


    Object Number: 71419  Size: SH
  8. Install the TOC front pipe front retaining clamp and bolt.
  9. Tighten
    Tighten the transmission oil cooler front pipe front retaining clamp bolt to 12 N·m (106 lb in).


    Object Number: 71420  Size: SH
  10. Lower the vehicle, leave it slightly above the ground.
  11. Install the TOC front pipe front clip.

  12. Object Number: 65352  Size: SH
  13. Install the RH engine mount (with bracket). Refer to Engine Mount Replacement in Engine Mechanical.
  14. Remove the J 41803 .
  15. Install the generator to the accessory mounting bracket. Refer to Generator Replacement in Engine Electrical.
  16. Install the A/C compressor bracket. Refer to Compressor in HVAC Systems with A/C - Manual.
  17. Position the power steering (P/S) gear and cooler to the front suspension crossmember.
  18. Install the P/S gear mounting bolts and nuts.
  19. Tighten
    Tighten the power steering gear mounting nuts to 100 N·m (74 lb ft).


    Object Number: 65353  Size: SH
  20. Install the P/S cooler retaining bolts.
  21. Tighten
    Tighten the power steering cooler retaining bolts to 11 N·m (97 lb in).


    Object Number: 70108  Size: SH
  22. Connect the intermediate shaft lower coupling to the power steering gear.
  23. Install the intermediate shaft lower coupling bolt.
  24. Tighten
    Tighten the intermediate shaft lower coupling bolt to 34 N·m (25 lb ft).

  25. Install the intermediate shaft lower coupling shield.

  26. Object Number: 71432  Size: SH
  27. Carefully pivot the A/C condenser and the radiator back into position.
  28. Install the air intake shroud and the air cleaner housing. Refer to Air Filter Element and Air Cleaner Assembly in Engine Controls.
  29. Connect the inlet and outlet radiator hoses to the radiator.
  30. Connect the inlet and outlet radiator hose clamps to the radiator.
  31. Install the upper radiator support and the air intake duct. Refer to Radiator Support Replacement in Engine Cooling.
  32. Flush the TOC and TOC pipes. Refer to Transmission Fluid Cooler Flushing .
  33. HAND-START and HAND-TIGHTEN the TOC front lower pipe fitting to the radiator.
  34. Tighten
    Tighten the transmission oil cooler front lower pipe fitting to the radiator to 27 N·m (20 lb ft).


    Object Number: 71421  Size: SH
  35. HAND-START and HAND-TIGHTEN the TOC front upper pipe fitting to the radiator.
  36. Tighten
    Tighten the transmission oil cooler front upper pipe fitting to the radiator to 27 N·m (20 lb ft).

  37. Lower the vehicle.
  38. Connect the negative battery cable.
  39. Tighten
    Tighten the negative battery cable bolt to 15 N·m (11 lb ft).

  40. Refill the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  41. Evacuate and charge the A/C system. Refer to Air Conditioning (A/C) Charging Using ACR4 in HVAC Systems with A/C - Manual.
  42. Check the transmission fluid level. Refer to Automatic Transmission Fluid Level Check/Fill .

Oil Cooler Hose/Pipe Replacement Rear

Removal Procedure


    Object Number: 71418  Size: SH
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the intermediate exhaust pipe. Refer to Intermediate Pipe in Engine Exhaust.
  3. Remove the RH muffler assembly. Refer to Muffler in Engine Exhaust.
  4. Remove the driveline tunnel closeout panel. Refer to Driveline Tunnel Closeout Panel in Propeller Shaft.
  5. Disconnect the transmission oil cooler (TOC) rear upper and lower pipe fittings from the junction fittings at the engine flywheel housing.

  6. Object Number: 71414  Size: SH
  7. Disconnect the TOC rear upper and lower pipe fittings from the transmission fittings.

  8. Object Number: 71415  Size: SH
  9. Remove the TOC rear pipe rear clip.

  10. Object Number: 71416  Size: SH
  11. Remove the TOC rear pipe middle clip.
  12. Remove the TOC rear pipe front and rear clamp bolts and clamps.
  13. Remove the rear transmission oil cooler pipes.

Installation Procedure


    Object Number: 71416  Size: SH
  1. Install the transmission oil cooler (TOC) rear pipes into position.
  2. Install the TOC rear pipe front and rear retaining clamps and bolts.
  3. Tighten
    Tighten the transmission oil cooler rear pipe front and rear retaining clamp bolts to 12 N·m (106 lb in).

    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.

  4. Install the TOC rear pipe middle clip.

  5. Object Number: 71415  Size: SH
  6. Install the TOC rear pipe rear clip.

  7. Object Number: 71414  Size: SH
  8. HAND-START and HAND-TIGHTEN the TOC rear upper and lower pipe fittings to the transmission fittings.
  9. Tighten
    Tighten the transmission oil cooler rear upper and lower pipe fittings to the transmission fittings to 27 N·m (20 lb ft).


    Object Number: 71418  Size: SH
  10. HAND-START and HAND-TIGHTEN the TOC rear upper and lower pipe fittings to the junction fittings at the engine flywheel housing.
  11. Tighten
    Tighten the transmission oil cooler rear upper and lower pipe fittings at the junction to 27 N·m (20 lb ft).

  12. Install the driveline tunnel closeout panel. Refer to Driveline Tunnel Closeout Panel in Propeller Shaft.
  13. Install the RH muffler assembly. Refer to Muffler in Engine Exhaust.
  14. Install the intermediate exhaust pipe. Refer to Intermediate Pipe in Engine Exhaust.
  15. Flush the transmission oil cooler and oil cooler pipes. Refer to Transmission Fluid Cooler Flushing .
  16. Check the transmission fluid level. Refer to Automatic Transmission Fluid Level Check/Fill .
  17. Lower the vehicle.