Service Procedure
Workflow
Chart A & B
Cooler Inlet And Outlet Locations
Cooler Cleaning (in radiator)
CAUTION:
You must refer to Charts A and B to determine the location of the oil cooler inlet and outlet hoses for the vehicle your working on.
If these hoses are not identified correctly, debris may be left in the cooler and transmission damage may occur.
1. Place an oil drain pan under the automatic transmission cooler Inlet and Outlet hoses.
2. Identify which hose is the Inlet and which hose is the Outlet to the oil cooler (refer to Charts A and B).
3. Disconnect the oil cooler Inlet and Outlet rubber hoses from the steel cooler tubes (see Figure 3).
^ For Frontier (D22) w/bypass valve, remove the oil cooler inlet and outlet rubber hoses from the bypass valve fittings (see Figure 6 shown)
NOTE:
If rubber material from a cooler hose remains on the steel tube or fitting, replace the rubber 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-A0006) 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 in areas with adequate ventilation.
^ Avoid contact with eyes and skin.
^ Do not breath vapors or mist from spray.
6. Hold the hose and can as high as possible and 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.
NOTE:
For Quest vehicles (V40/V41 Models), before removing the extension adapter hose from the cooler Outlet hose, turn the can over and spray only propellant (gas) for a few seconds. This will avoid fluid spill back out of the cooler hose.
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
9. Blow compressed air regulated to 5-9 kg/sq.cm (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/sq.cm (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 next step.
Frontier (D22) Cooler Bypass Cleaning
1. Place an oil drain pan under oil cooler hoses or lines before removing them.
2. Remove the lines from the transmission and allow the oil to drain from the lines (See Figure 6).
3. Remove the lines from the bypass valve (see Figure 6).
4. Use hose clamps and temporarily connect a length of suitable hose between the bypass valve fittings that go to the oil cooler (see Figure 6).
5. Pinch/clamp the temporary hose to prevent flow through the loop (see Figure 6).
6. Cover the end of the bypass inlet line with a shop rag to catch any oil spray.
7. Blow compressed air regulated to 5-9 kg/sq.cm (70 - 130 PSI) into the outlet for 10 second intervals, three times (see Figure 6).
8. Re-connect the transmission lines and remove the temporary hose loop (see Figure 7).
9. Go to Diagnosis Procedure (All Vehicles).
1996-98 Pathfinder (R50) Cleaning the Optional Air Cooled Oil-Cooler (Air Cooler)
1. Place an oil drain pan under the A/T air cooler Inlet and Outlet hoses (see Points A and B, Figure 8).
2. Disconnect the Inlet and Outlet hoses from the air cooler (see Points A and B, Figure 8).
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 8).
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 the spray mist.
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 for 5 seconds (Point A, Figure 8).
5. Insert the tip of an air gun into the end of the air cooler Outlet hose (see Point B, Figure 9).
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/sq.cm (70 - 130 PSI) through the air cooler Outlet hose to force any remaining oil or cleaner through the air cooler and out of the air cooler Inlet hose (see Point A, Figure 9).
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 Inlet and Outlet hoses for the oil cooler in the radiator of the vehicle you are working on.
If you do not identify the Inlet and Outlet hoses correctly, debris may be left inside the "in radiator" cooler and transmission damage may occur.
NOTE:
Failure to clean the exterior of the Cooler Inlet hose properly may lead to inaccurate debris identification.
1. Place an oil drain pan under the automatic transmission "in radiator" cooler Inlet and Outlet hoses.
2. Clean the exterior and tip of the cooler Inlet hose.
3. Insert the "extension adapter hose" from a can of Transmission Cooler Cleaner (Nissan P/N 999MP-AM006) into the Outlet hose of the oil cooler in the radiator (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 vapors or mist from spray.
4. Hold the hose and can as high as possible and 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.
NOTE:
For Quest vehicles (V40/V41 Models);
^ before removing the extension adapter hose from the cooler Outlet hose,
^ turn the can over and spray only propellant for a few seconds to avoid fluid spilling back out of the cooler hose.
5. Tie a common white, basket-type coffee filter to the end of the cooler Inlet hose (see Figure 10).
6. Insert the tip of an air gun into the end of the cooler Outlet hose (see Figure 11).
7. Wrap a shop rag around the air gun tip and end of the cooler Outlet hose (see Figure 11).
8. Blow compressed air regulated to 5-9 kg/sq.cm (70 - 130 PSI) through the cooler Outlet hose to force any remaining cleaner or fluid into the coffee filter (see Figure 11).
9. Remove the coffee filter from the end of the cooler Inlet hose.
10. Proceed with Inspection Procedure.
Inspection Procedure
1. Inspect the coffee filter for debris (see Figure 12).
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 and/or peeled clutch facing material is found in the coffee filter (see Figure 13), 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.