Nissan Altima L32. Manual - part 802

HA-28

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ELECTRICAL LEAK DETECTOR

ELECTRICAL LEAK DETECTOR

Electronic Refrigerant Leak Detector

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PRECAUTIONS FOR HANDLING THE LEAK DETECTOR

When performing a refrigerant leak check, use a electronic refriger-

ant leak detector (J-41995) or equivalent. Ensure that the instrument

is calibrated and set properly per the manufacturer's operating

instructions.

The leak detector is a delicate device. In order to use the leak detec-

tor properly, read the manufacturer's operating instructions and per-

form any specified maintenance.

1. Position the leak detector probe approximately 5 mm (3/16 in)

away from the point to be checked.

2. When testing, circle each fitting completely with the leak detec-

tor probe.

3. Move the leak detector probe along the component at approxi-

mately 25 to 50 mm (1 to 2 in)/sec.

CHECKING PROCEDURE

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.

AHA281A

SHA707EA

SHA706E

SHA708EA

ELECTRICAL LEAK DETECTOR

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1. Turn engine OFF.
2. Connect a suitable A/C manifold gauge set to the A/C service ports.
3. Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm

2

, 50 psi) above 16

°C (61°F). If less

than specification, recover/evacuate and recharge the system with the specified amount of refrigerant.

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. Conduct the leak test from the high side (compressor discharge to evaporator inlet) to the low side (evap-

orator drain hose to the compressor shaft seal). Refer to 

HA-31, "Component"

. Clean the component to

be checked and move the leak detector probe completely around the connection/component.

Perform a leak check for the following areas:

• Compressor

• High and low-pressure hose fittings, relief valve and shaft seal.

• Liquid tank

• Refrigerant pressure sensor

• Service valves

- Check that all the service valve caps are secure on the service valves (to prevent leaks).

- After removing A/C manifold gauge set from service valves, wipe any residue from the valves to prevent

any false readings by the leak detector.

• Evaporator

- With engine OFF, turn blower fan on high speed for at least 15 seconds to dissipate any refrigerant trace

around the evaporator. Wait a minimum of 10 minutes accumulation time (refer to the manufacturer's

recommended procedure for actual wait time) before inserting the leak detector probe into the drain

hose.

- 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 detector detects a leak, verify at least once by blowing compressed air into area of suspected

leak, then repeat check as outlined above.

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

If no leaks are found, perform steps 7 - 10.

7. Start engine.
8. Set the front air control as follows;
a. A/C switch: ON
b. Mode: Vent
c. Intake position: Recirculation
d. Temperature: MAX cold
e. Blower fan speed: High
9. Run engine at 1,500 rpm for at least 2 minutes.
10. Turn engine off and perform leak check again following steps 4

through 6 above.

Refrigerant leaks should be checked immediately after stopping

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

pressure on the high pressure side will gradually drop after

refrigerant circulation stops and pressure on the low pressure

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

more easily detected when pressure is high.

11. Before connecting the recovery/recycling equipment to the A/C system, check the recovery/recycling

equipment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover the

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

12. Confirm the refrigerant purity in the supply tank using the recovery/recycling equipment and the refrigerant

identifier equipment.

SHA839E

HA-30

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ELECTRICAL LEAK DETECTOR

13. Confirm the refrigerant purity in the A/C system using the recovery/recycling equipment and the refriger-

ant identifier equipment.

14. Discharge the A/C system using approved refrigerant recovery/recycling equipment. Repair the leaking fit-

ting or component as necessary.

15. Evacuate and recharge the A/C system and perform the leak test to confirm there are no refrigerant leaks.
16. Conduct the A/C performance test to ensure that the system works properly. Refer to 

HAC-5, "Operational

Check"

.

REFRIGERATION SYSTEM

HA-31

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ON-VEHICLE REPAIR

REFRIGERATION SYSTEM

Component

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