Nissan Titan A60. Manual - part 574

ELECTRICAL LEAK DETECTOR

HA-25

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ELECTRICAL LEAK DETECTOR

Electronic Refrigerant Leak Detector

INFOID:0000000006163108

PRECAUTIONS FOR HANDLING LEAK DETECTOR

NOTE:

When performing a refrigerant leak check, use a electronic refrigerant leak detector (J-41995) or equivalent.

Ensure that the electronic refrigerant leak detector (J-41995) is calibrated and set properly according to the

manufacturer's operating instructions.

The electronic refrigerant leak detector (J-41995) is a delicate

device. To use the electronic refrigerant leak detector (J-41995)

properly, read the manufacturer's operating instructions and perform

any specified maintenance.

1. Position the probe approximately 5 mm (3/16 in) away from the

point to be checked as shown.

2. When checking for leaks, circle each fitting completely with the

probe as shown.

3. Move the probe along each component at a speed of approxi-

mately 25 - 50 mm (1 - 2 in)/second as shown.

CHECKING PROCEDURE

AHA281A

SHA707EA

SHA706E

SHA708EA

HA-26

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ELECTRICAL LEAK DETECTOR

NOTE:

To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette

smoke in the vicinity of the vehicle. Perform the leak test in a calm area (low air/wind movement) so that the

leaking refrigerant is not dispersed.
1. Turn the engine OFF.
2. Connect the manifold gauge set (J-39183-C) to the A/C service ports. Refer to 

HA-22, "HFC-134a (R-

134a) Service Procedure"

 .

3. Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm

2

 , 50 psi) above a temperature of

16

°C (61°F). If less than specification, recover/evacuate and recharge the system with the specified

amount of refrigerant. Refer to 

HA-22, "HFC-134a (R-134a) Service Procedure"

 .

NOTE:

At temperatures below 16

°C (61°F), leaks may not be detected since the system may not reach 345 kPa

(3.52 kg/cm

2

 , 50 psi) pressure.

4. Perform the leak test from the high-pressure side (A/C compressor discharge “a” to evaporator inlet “f”) to

the low-pressure side (A/C evaporator drain hose “g” to shaft seal “k”). Refer to 

HA-28, "Component"

 .

Clean the component to be checked and carefully move the electronic refrigerant leak detector probe

completely around the following connections and components.

• Check the compressor shaft seal

• Check the high and low-pressure pipe and hose fittings, relief valve, and compressor shaft seal

• Check the liquid tank

• Check the refrigerant pressure sensor

• Check all around the service valves. Check that the service valve caps are screwed tightly on the ser-

vice valves (to prevent leaks).

NOTE:

After removing manifold gauge set (J-39183-C) from the service valves, wipe any residue from the ser-

vice valves to prevent any false readings by the electronic refrigerant leak detector (J-41995).

• Evaporator

With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in

the heater and cooling unit assembly. Wait a minimum of 10 minutes accumulation time (refer to the

manufacturer's recommended procedure for actual wait time) before inserting the electronic refrigerant

leak detector probe into the heater and cooling unit assembly drain hose.

NOTE:

Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water

or dirt that may be in the drain hose.

5. If a leak is detected, verify at least once by blowing compressed air into the area of the suspected leak,

then repeat the leak check.

6. Do not stop when one leak is found. Continue to check for additional leaks at all system components and

connections.

7. If no leaks are found, perform steps 8 - 11.
8. Start the engine.
9. Set the heater A/C controls as follows:

NOTE:

For the automatic system, turn OFF the automatic controls and set the heater A/C controls manually.

a. A/C switch to ON
b. Air flow to VENT mode
c.

Intake position to RECIRCULATION mode

d. Temperature to MAX cold
e. Blower fan speed to HIGH

10. Run the engine at 1,500 rpm for at least 2 minutes.

ELECTRICAL LEAK DETECTOR

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11. Turn the engine OFF and perform the leak check again following

steps 4 through 6 above.

Refrigerant leaks should be checked immediately after turning

the engine OFF. Begin with the leak detector at the compressor.

The pressure on the high pressure side will gradually drop after

the refrigerant circulation stops and pressure on the low pres-

sure side will gradually rise, as shown in the graph. Some leaks

are more easily detected when the pressure is high.

12. Before connecting the recovery/recycling equipment to the vehicle, check the recovery/recycling equip-

ment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover the refriger-

ant from the equipment lines and then check the refrigerant purity.

13. Confirm refrigerant purity in supply tank using recovery/recycling equipment and refrigerant identifier

equipment.

14. Confirm the refrigerant purity in the vehicle's A/C system using recovery/recycling equipment and refriger-

ant identifier equipment.

15. Discharge the A/C system using recovery/recycling equipment. Repair the leaking fitting or component as

necessary.

16. Evacuate and recharge the A/C system and perform the leak test to confirm that there are no refrigerant

leaks.

17. Conduct the Operational Check to ensure system works properly. Refer to 

HAC-6, "Operational Check"

 .

SHA839E

HA-28

< REMOVAL AND INSTALLATION >

REFRIGERATION SYSTEM

REMOVAL AND INSTALLATION

REFRIGERATION SYSTEM

Component

INFOID:0000000006163109

A/C Compressor and Condenser

ALIIA0402ZZ