Service Procedure

Workflow

Cooler Inlet And Outlet Locations:





Chart A - Front Wheel Drive (FWD) Cooler Inlet/Outlet Identification








Chart B - Rear Wheel Drive (RWD) Cooler Inlet/Outlet Identification

Cooler Cleaning (in radiator) Procedure

CAUTION:
You must refer to Charts A and B to determine the location of the Cooler Inlet and Outlet hoses for the vehicle you're working on.

If these hoses are not identified correctly, debris may be left in the cooler and transmission damage may occur.

NOTE:
1992 Q45's/G50's after VIN JNKNG01C(*)NM205387 and ALL 1993 Q45's/G50's are equipped with a twin oil cooler system. You must perform the following Cooler Cleaning (in radiator) Procedure on both coolers.

1. Place an oil drain pan under the automatic transmission's Inlet and Outlet cooler hoses.

2. Identify the Inlet and Outlet oil cooler hoses (refer to Charts A and B).





3. Disconnect the Oil Cooler Inlet and Outlet rubber hoses from the steel cooler tubes (see Figure 3).

NOTE:
If rubber material from a cooler hose remains on the tube fitting, replace the hose.

4. Allow any transmission fluid that remains in the Cooler hoses to drain into the oil pan.





5. Insert the "extension adapter hose" from a can of Transmission Cooler Cleaner (Nissan P/N 999MP-AM006) into the Cooler Outlet hose (see Figure 4).

CAUTION:
^ Wear safety glasses and rubber gloves when spraying the Transmission Cooler Cleaner.
^ Spray Cooler Cleaner only with adequate ventilation.
^ Avoid contact with eyes and skin.
^ Do not breath the vapors or mist from spray.

6. Hold the hose and can as high as possible. Spray Transmission Cooler Cleaner in a continuous stream into the Cooler Outlet hose until fluid flows out of the Cooler Inlet hose for 5 seconds.





7. Insert the tip of an air gun into the end of the Cooler Outlet hose (see Figure 5).

8. Wrap a shop rag around the air gun tip and end of the Cooler Outlet hose (see Figure 5).

9. Blow compressed air regulated to 5-9 kg/cm2 (70 - 130 PSI) through the Cooler Outlet hose for 10 seconds to force out any remaining fluid.

10. Repeat steps 5 through 9 three additional times.

11. Place an oil drain pan under the banjo bolts that connect the oil cooler steel lines to the transmission.

12. Remove the "banjo" bolts at the transmission, and pull the line fittings away from the transmission.

13. Flush each steel line from the cooler side back toward the transmission by spraying Transmission Cooler Cleaner in a continuous stream for 5 seconds.

14. Blow compressed air regulated to 5-9 kg/cm2 (70 - 130 PSI) through each steel line from the cooler side back toward the transmission for 10 seconds to force out any remaining fluid.

15. Ensure all debris is removed from the steel cooler lines.

16. Ensure all debris is removed from the banjo bolts and fittings.

17. Go to the Workflow chart for the next step.

Cleaning Optional Air Cooled Oil-Cooler (1997-98 QX4 (JR50) only)





1. Place an oil drain pan under the A/T Air Cooler Inlet and Outlet hoses (see Points A and B, Figure 6).

2. Disconnect the Air Cooler Inlet and Outlet hoses from the Air Cooler (see Points A and B, Figure 6).

3. Insert the "extension adapter hose" from a can of Transmission Cooler Cleaner (Nissan P/N 999MP-AM006) into the Air Cooler Outlet hose (see Point B, Figure 6).

CAUTION:
^ Wear safety glasses and rubber gloves when spraying the Transmission Cooler Cleaner.
^ Spray Cooler Cleaner only with adequate ventilation.
^ Avoid contact with eyes and skin.
^ Do not breath the vapors or mist from spray.

4. Hold the hose and can as high as possible. Spray Transmission Cooler Cleaner in a continuous stream into the Air Cooler Outlet hose until fluid flows out of the Air Cooler Inlet hose (Point A, Figure 6) for 5 seconds.





5. Insert the tip of an air gun into the end of the Air Cooler Outlet hose (see Point B, Figure 7).

6. Wrap a shop rag around the air gun tip and end of the Air Cooler Outlet hose.

7. Blow compressed air regulated to 5-9 kg/cm2 (70 - 130 PSI) through the Air Cooler Outlet hose to force any remaining ATF and cleaner through the Air/Oil Cooler and out of the Air Cooler Inlet hose (see Point A, Figure 7).

8. Proceed with Diagnosis Procedure (All Vehicles), below.

Diagnosis Procedure (All Vehicles)

You will be taking a sample of the debris to determine if the radiator/oil cooler must be replaced.

CAUTION:
You must refer to Charts A and B to determine the location of the Outlet and Inlet hoses for the oil cooler in the radiator of the vehicle you are working on.

If not identified correctly, debris may be left in the in radiator cooler and transmission damage may occur.

NOTE:
Failure to clean the cooler Inlet hose exterior properly may lead to inaccurate debris identification.

NOTE:
1992 Q45's/G50's after VIN JNKNG01C(*)NM205387 and all 1993 Q45's/G50's are equipped with a twin oil cooler system in the radiator. You must perform the "All Vehicles" Diagnosis Procedure on both coolers.

1. Place an oil drain pan under the Inlet and Outlet hoses of the A/T oil cooler in the radiator.

2. Clean the exterior and tip of the Cooler Inlet hose.

3. Insert the extension adapter hose of a can of Transmission Cooler Cleaner (Nissan P/N 999MP-AM006) into the Cooler Outlet hose (see Figure 4).

CAUTION:
^ Wear safety glasses and rubber gloves when spraying the Transmission Cooler Cleaner.
^ Spray Cooler Cleaner only with adequate ventilation.
^ Avoid contact with eyes and skin.
^ Do not breath the vapors or mist from spray.

4. Hold the hose and can as high as possible. Spray Transmission Cooler Cleaner in a continuous stream into the Cooler Outlet hose until fluid flows out of the Cooler Inlet hose for 5 seconds.





5. Tie a common white, basket-type coffee filter to the end of the Cooler Inlet hose (see Figure 8).





6. Insent the tip of an air gun into the end of the Cooler Outlet hose (see Figure 9).

7. Wrap a shop rag around the air gun tip and end of the Cooler Outlet hose (see Figure 9).

8. Blow compressed air regulated to 5-9 kg/sq.cm (70 - 130 PSI) through the Cooler Outlet hose to force any remaining ATF into the coffee filter (see Figure 9).

9. Remove the coffee filter from the end of the Cooler Inlet hose.

10. Proceed with Inspection Procedure.

Inspection Procedure

NOTE:
1992 Q45's/G50's after VIN JNKNG01C(*)NM205387 and all 1993 Q45's/G50's are equipped with a twin oil cooler system in the radiator. For these vehicles, you must perform the Inspection Procedure on each of the two coffee filters removed from the cooler inlet hoses in step 9 of the Diagnosis Procedure.





1. Inspect the coffee filter for debris (see Figure 10).

A. If small metal debris less than 1 mm (0.040 inch) in size or metal powder is found in the coffee filter, this is normal. If normal debris is found, the radiator/oil cooler can be re-used.





B. If one or more pieces of debris are found that are over 1 mm in size (see Figure 11) and/or peeled clutch facing material is found in the coffee filter, the oil-cooler is not serviceable. The radiator/oil cooler must be replaced.

Final Inspection

After performing all procedures, ensure that all remaining oil is cleaned from all components.