Nissan Titan A60. Manual - part 946

TM-172

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A/T FLUID COOLER

A/T FLUID COOLER

A/T Fluid Cooler Cleaning

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Whenever an A/T is repaired, overhauled, or replaced, the A/T fluid cooler mounted in the radiator must be

inspected and cleaned.

Metal debris and friction material, if present, can become trapped in the A/T fluid cooler. This debris can con-

taminate the newly serviced A/T or, in severe cases, can block or restrict the flow of A/T fluid. In either case,

malfunction of the newly serviced A/T may result.

Debris, if present, may build up as A/T fluid enters the cooler inlet. It will be necessary to back flush the cooler

through the cooler outlet in order to flush out any built up debris.

A/T FLUID COOLER CLEANING PROCEDURE

1. Position a drain pan under the A/T inlet and outlet fluid cooler tube to cooler hose connection.
2. Put a different color matching mark on each cooler tube to cooler hose connection to aid in assembly.

CAUTION:

Use paint to make the matching mark. Do not damage the tubes or hose.

3. Disconnect the fluid cooler inlet and outlet rubber hoses from the

steel cooler tubes.

NOTE:

Replace the cooler hoses if rubber material from the hose

remains on the tube fitting.

4. Drain any A/T fluid from the cooler hose.

5. Insert the extension adapter hose of a can of Transmission

Cooler Cleaner (Nissan P/N 999MP-AM006) into the cooler out-

let hose.

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 spray mist.

6. Hold the hose and can as high as possible and spray Transmis-

sion 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.
8. Wrap a shop rag around the tip of the air gun and the cooler out-

let hose.

9. Blow compressed air regulated to 5 - 9 kg/cm

2

 (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. Position an oil pan under the banjo bolts that connect the fluid cooler tubes to the A/T.
12. Remove the banjo bolts.

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A/T FLUID COOLER

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13. Flush each steel line from the cooler side back toward the A/T by spraying Transmission Cooler Cleaner

in a continuous stream for 5 seconds.

14. Blow compressed air regulated to 5 - 9 kg/cm

2

 (70 - 130 psi) through each steel line from the cooler side

back toward the A/T 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. Perform A/T fluid cooler diagnosis.

A/T FLUID COOLER DIAGNOSIS PROCEDURE

NOTE:

Insufficient cleaning of the cooler inlet hose exterior may lead to inaccurate debris identification.
1. Position a drain pan under the A/T inlet and outlet fluid cooler tube to cooler hose connection.
2. Clean the exterior and tip of the cooler inlet hose.
3. Put a different color matching mark on each cooler tube to cooler hose connection to aid in assembly.

CAUTION:

Use paint to make the matching mark. Do not damage the tubes or hose.

4. Disconnect the fluid cooler inlet and outlet rubber hoses from the

steel cooler tubes.

NOTE:

Replace the cooler hoses if rubber material from the hose

remains on the tube fitting.

5. Insert the extension adapter hose of a can of Transmission

Cooler Cleaner (Nissan P/N 999MP-AM006) into the cooler out-

let hose.

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 spray mist.

6. Hold the hose and can as high as possible and spray Transmis-

sion Cooler Cleaner in a continuous stream into the cooler outlet

hose until fluid flows out of the cooler inlet hose for 5 seconds.

7. Tie a common white, basket-type coffee filter to the end of the

cooler inlet hose.

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A/T FLUID COOLER

8. Insert the tip of an air gun into the end of the cooler outlet hose.
9. Wrap a shop rag around the air gun tip and end of cooler outlet

hose.

10. Blow compressed air regulated to 5 - 9 kg/cm

2

   (70 - 130 psi)

through the cooler outlet hose to force any remaining A/T fluid

into the coffee filter.

11. Remove the coffee filter from the end of the cooler inlet hose.
12. Perform A/T fluid cooler inspection.

A/T FLUID COOLER INSPECTION PROCEDURE

1. Inspect the coffee filter for debris.
a. If small metal debris less than 1mm (0.040 in) in size or metal

powder is found in the coffee filter, this is normal. If normal

debris is found, the A/T fluid cooler/radiator can be re-used and

the procedure is ended.

b. If one or more pieces of debris are found that are over 1mm

(0.040 in) in size and/or peeled clutch facing material is found in

the coffee filter, the fluid cooler is not serviceable. The A/T fluid

cooler/radiator must be replaced and the inspection procedure is

ended. Refer to 

CO-16, "Removal and Installation"

.

A/T FLUID COOLER FINAL INSPECTION

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

Inspection

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

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STALL TEST

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STALL TEST

Inspection and Judgment

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A/T FLUID CHECK

Fluid Leakage and Fluid Level Check 

• Inspect for fluid leakage and check the fluid level. Refer to 

TM-168, "Checking the A/T Fluid (ATF)"

.

Fluid Condition Check

Inspect the fluid condition.

STALL TEST 

Stall Test Procedure

1. Inspect the amount of engine oil. Replenish the engine oil if necessary.
2. Drive for about 10 minutes to warm up the vehicle so that the A/

T fluid temperature is 50 to 80

°C (122 to 176°F). Inspect the

amount of ATF. Replenish if necessary.

3. Securely engage the parking brake so that the tires do not turn.

Fluid condition

Conceivable Cause

Required Operation

Varnished (viscous 
varnish state)

Clutch, brake 
scorched

Replace the ATF and check the A/T 
main unit and the vehicle for mal-
functions (wire harnesses, cooler 
pipes, etc.)

Milky white or 
cloudy

Water in the fluid

Replace the ATF and check for plac-
es where water is getting in.

Large amount of 
metal powder mixed 
in

Unusual wear of 
sliding parts within 
A/T

Replace the ATF and check for im-
proper operation of the A/T.

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