Yukon 4WD V8-5.3L (2008)
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 Cooling System Draining and Filling (Static Fill).
21. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging.
Line Sectioning Repair
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 Cooling System Draining and Filling (Static Fill).
3. Raise and support the vehicle. Refer to Vehicle Lifting.
4. Obtain a new A/C or heater line for sectioning.
Important: Stagger the splices if repairing more than one line.
5. Scribe a mark on the line that will be sectioned.
6. Use a tubing cutter in order to cut the line or lines being replaced.
7. Remove the section of line being replaced from the vehicle.
Important: The length of the replacement line must be the same as the line being replaced.
8. Install the replacement line to the vehicle.
9. Use a tubing cutter in order to cut the replacement line to length.
10. Use the cleaning pad from the J 41425 in order to clean any burrs or grease. Be sure to clean at least 19 mm (0.75 in) from the A/C line.
11. Use the LOK prep sealant in order to prep the A/C or heater line.
12. Apply one drop of the J 41425-3 sealing compound to the outside of each line end.
13. Insert the line ends into the LOK fitting.
14. Rotate the LOK fitting one complete turn in order to evenly distribute the sealing compound around the lines.
15. Install the correct LOK fitting jaws into the J 41425-1 tool.
16. 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.
17. Hold the tool body with a 3/8" breaker bar. Turn the forcing screw until both of the connector collars bottom on the center shoulder of the LOK
fitting.
18. Loosen the forcing screw. Remove the tool from the repaired line.
19. Verify that the LOK fitting is correctly installed.
20. Lower the vehicle.
21. Refill the coolant, if drained. Refer to Cooling System Draining and Filling (Static Fill).
22. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to Refrigerant Recovery and Recharging.
Evaporator Tube Replacement (Non HP2)
Evaporator Tube Replacement (Non HP2)
Tools Required
J 39400-A Halogen Leak Detector
Removal Procedure
1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.
2. Remove the upper radiator air baffle and deflector.
3. Remove the air cleaner assembly.
4. Remove the surge tank hold down nut and bolt and position aside.
Important: Do not open cooling system.
