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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Heating, Ventilation, And Air Conditioning) >> Repair Instructions >> Auxiliary Heater and Air Conditioning Pipe Repair >> Straight Line Repair

Straight Line Repair

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Recover the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging .
  2. Drain the coolant, if repairing the heater lines. Refer to Draining and Filling Cooling System .
  3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  4. Locate the area that requires repair.
  5. Obtain a length of replacement line to make the repair.
  6. Use a tubing cutter in order to cut and remove the section of damaged line.
    7. IMPORTANT: The length of the replacement line must be the same as the section being replaced.
  7. Use a tubing cutter in order to cut the replacement line to length.
  8. Use the cleaning pad from the J 41425  in order to clean any burrs or grease from the line ends. See Special Tools . Be sure to clean at least 19 mm (0.75 in) from the line ends.
  9. Use the LOK prep sealant in order to prep the line ends.
  10. Apply one drop of the J 41425-3 sealing compound to the outside of each end of the line.
  11. Insert the line ends into the LOK fitting.
  12. Rotate the LOK fitting one complete turn in order to evenly distribute the sealing compound around the lines.
  13. Install the correct LOK fitting jaws into the J 41425-1 tool.
  14. Install the J 41425-1 tool over the LOK connectors.

    Verify that the LOK connector ends are positioned in the counter bores of the jaws.

    15. IMPORTANT: Hold the J 41425-1 tool body with a 3/8" breaker bar.
  15. Tighten the forcing screw of the J 41425-1 tool.

    When fully seated, the LOK connector collars will bottom out on the center shoulder of the LOK fitting.

  16. Loosen the forcing screw and remove the J 41425-1 tool from the repaired line.
  17. Repeat Step 8 through Step 16 to repair the other end of the line.
  18. Verify that the LOK fittings are correctly installed.
  19. Lower the vehicle.
  20. Refill the coolant, if drained. Refer to Draining and Filling Cooling System .
  21. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging .
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