GM Service Manual Online
For 1990-2009 cars only

Air Conditioning Compressor Hose Replacement LS3, LS7

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

  1. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging.
  2. Remove the radiator support. Refer to Radiator Support Replacement.
  3. Note: Prior to removal, take note of the A/C compressor hose assembly routing and orientation between the compressor and condenser.

    Cap or tape off the open A/C components immediately to prevent system contamination.


    Object Number: 1488941  Size: SH
  4. Remove the A/C compressor hose assembly bolt from the A/C condenser fitting.
  5. Disconnect the A/C compressor hose assembly from the A/C condenser fitting.
  6. Remove and discard the sealing washer.
  7. Cap or tape off the A/C condenser fitting.

  8. Object Number: 1313943  Size: SH
  9. Disconnect and remove the A/C tube connector from the evaporator outlet tube and A/C compressor hose assembly. Refer to Air Conditioning Line/Tube Connector Removal/Replacement.

  10. Object Number: 1488797  Size: SH
  11. Disconnect the evaporator outlet tube from the A/C compressor hose assembly.
  12. Cap or tape off the evaporator outlet tube.
  13. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  14. Remove the right front tire and wheel assembly from the vehicle. Refer to Tire and Wheel Removal and Installation+.

  15. Object Number: 1488786  Size: SH
  16. For the 7.0L only, remove the compressor mounting bolts and nuts and lower the compressor. Refer to Air Conditioning Compressor Replacement.
  17. Remove the A/C compressor hose assembly to A/C compressor retaining bolt.
  18. Disconnect the A/C compressor hose assembly from the A/C compressor.
  19. Remove and discard the sealing washers.
  20. Cap or tape off the A/C compressor.
  21. Remove the A/C compressor hose assembly from the vehicle.

Installation Procedure

  1. Install the A/C compressor hose assembly to the vehicle.

  2. Object Number: 1488786  Size: SH
  3. Remove cap or tape from the A/C compressor.
  4. Install new sealing washers onto the compressor hose assembly. Refer to Sealing Washer Replacement.
  5. Connect the A/C compressor hose assembly to the A/C compressor.
  6. Caution: Refer to Fastener Caution in the Preface section.

  7. Install the A/C compressor hose assembly to A/C compressor retaining bolt and tighten to 20 N·m (15 lb ft).
  8. For the 7.0L only, reposition the compressor and install the bolts and nuts. Refer to Air Conditioning Compressor Replacement.
  9. Install the right front tire and wheel assembly to the vehicle. Refer to Tire and Wheel Removal and Installation.
  10. Lower the vehicle.

  11. Object Number: 1488797  Size: SH
  12. Remove cap or tape from the evaporator outlet tube.
  13. Install a new O-rings onto the evaporator outlet tube. Refer to O-Ring Replacement.
  14. Connect the evaporator outlet tube to the A/C compressor hose assembly.
  15. Install the A/C tube connector to the evaporator outlet tube and A/C compressor hose assembly. Refer to Air Conditioning Line/Tube Connector Removal/Replacement.

  16. Object Number: 1488941  Size: SH
  17. Remove cap or tape from the A/C condenser fitting.
  18. Install a new sealing washer onto the compressor hose assembly. Refer to Sealing Washer Replacement.
  19. Connect the A/C compressor hose assembly to the A/C condenser fitting.
  20. Install the A/C compressor hose assembly bolt to the A/C condenser fitting and tighten to 16 N·m (12 lb ft).
  21. Install the radiator support. Refer to Radiator Support Replacement.
  22. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
  23. Leak test the fittings of the component using J 39400-A Halogen Leak Detector .