Transmission Fluid Cooler Hose/Pipe Replacement 6.6L

1. Disconnect the oil cooler lines from the radiator. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection .
2. Remove the oil cooler lines from the radiator.



3. If equipped with the auxiliary transmission oil cooler, remove the outlet pipe from the auxiliary cooler pipe.
4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .



5. Disconnect the transmission oil cooler lines from the transmission. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection .
6. Remove the oil cooler lines from the transmission.
7. Remove the oil cooler lines from the clips on the frame rail.

Important: Note the routing of the transmission lines to ensure proper installation.

8. Remove the cooler lines from the vehicle.

1. Install the transmission oil cooler line to the vehicle.

Important: Do not reuse any of the existing retaining rings that were removed from the existing quick connect fittings. All retaining rings being installed must be New.

2. Install the new retaining ring (E-clip) into the quick connect fitting.

Important: Ensure the transmission lines are position in the support bracket and the clips are installed.

3. Install the transmission oil cooler lines to the transmission. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection .
4. Lower the vehicle.



5. If equipped with the auxiliary oil cooler, install the inlet line to the radiator and the outlet to the auxiliary cooler line.



6. Install the oil cooler lines to the radiator. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection .
7. Fill the transmission to proper level. Refer to Transmission Fluid Check .

Transmission Fluid Cooler Hose/Pipe Replacement 4.8L, 5.3L, 6.0L

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Support the vehicle with safety stands.



3. Remove the 2 oil cooler lines from the radiator.



4. If equipped with the auxiliary transmission oil cooler, remove the outlet pipe from the auxiliary cooler pipe.



5. Remove the 2 oil cooler lines from the transmission.
6. Remove the 2 oil cooler lines from the clips on the frame rail.




Note: Perform the following procedures when removing the retaining ring and cooler line from the quick connect fitting on the transmission.

7. Pull the plastic cap back from the quick connect fitting and down along the cooler line about two inches.



8. Using a bent-tip screwdriver, pull on one of the open ends of the retaining ring in order to rotate the retaining ring around the quick connect fitting until the retaining ring is out of position and can be completely removed.



9. Remove the retaining ring from the quick connect fitting.
10. Discard the retaining ring.



11. Pull the cooler line straight out from the quick connect fitting.
12. Remove the retaining ring (E-clips) securing the cooler line to the quick connect in order to remove the remaining cooler lines from the remaining quick connect fittings.
13. Remove the cooler lines from the vehicle.
14. Lower the vehicle.

1. Raise the vehicle.



2. Install the transmission oil cooler line to the vehicle.

Note: Do not reuse any of the existing retaining rings that were removed from the existing quick connect fittings. All retaining rings being installed must be New.

3. Install the new retaining ring (E-clip) into the quick connect fitting.



4. Install the 2 cooler lines to the radiator.



5. If equipped with the auxiliary oil cooler, install the inlet line to the radiator and the outlet to the auxiliary cooler line.



6. Install the 2 oil cooler lines to the transmission.



7. Hook one of the open ends of the retaining ring in one of the slots in the quick connect fitting.



8. Rotate the retaining ring around the fitting until the retaining ring is positioned with all three ears through the three slots on the fitting.



9. Do not install the new retaining ring onto the fitting by pushing the retaining ring down over the fitting.



10. Ensure that the three retaining ring ears are seen from inside the fitting and that the retaining ring moves freely in the fitting slots.
11. Install the new retaining ring (E-clip) into the remaining quick connect fittings.




Caution: Ensure that the cooler line being installed has a plastic cap on each end that connects to a quick connect fitting. If no plastic cap exists, or the plastic cap is damaged, obtain a new plastic cap and position on to the cooler line prior to the cooler line installation.

12. Install the cooler line into the quick connect fitting.
13. Insert the cooler line end into the quick connect fitting until a click is either heard or felt.



14. Do not use the plastic cap on the cooler line in order to install the cooler line into the fitting.
15. Pull back sharply on the cooler line in order to ensure that the cooler line is fastened into the quick connect fitting.



16. Position (snap) the plastic cap onto the fitting. Do not manually depress the retaining ring when installing the plastic cap onto the quick connect fitting.
17. Ensure that the plastic cap is fully seated against the fitting.



18. Ensure that no gap is present between the cap and the fitting.



19. Ensure that the yellow identification band on the tube is hidden within the quick connect fitting. A hidden yellow identification band indicates proper joint seating.



20. Do not install the cooler line into the fitting incorrectly.
21. If you cannot position the plastic cap against the fitting, remove the retaining ring from the quick connect fitting per step 3 of the cooler line removal procedure. Check the retaining ring and the tube end in order to ensure neither is bent. Replace the cooler line or the retaining ring if necessary, and reinstall per Step 1 of the cooler line installation procedure.
22. Install the cooler line into the quick connect fitting again in order to install the remaining cooler lines into the remaining quick connect fittings.



23. Install the engine or transmission cooler lines to the frame.
24. Lower the vehicle.