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Nissan GT-R. Manual - part 159

ELECTRICAL LEAK DETECTOR

HA-29

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ELECTRICAL LEAK DETECTOR

Inspection

INFOID:0000000009160195

PRECAUTIONS FOR HANDLING LEAK DETECTOR

Use an electrical leak detector (SST: J-41995) or equivalent when
performing a refrigerant leakage check. Ensure that the instrument is
calibrated and set properly per the operating instructions.
The leak detector is a delicate device. Read the operating instruc-
tions and perform any specified maintenance for using the leak
detector properly.

Position probe approximately 3 mm (0.12 in) away from point to
be checked.

Circle each fitting completely with probe when testing.

Move probe along component approximately 25 to 50 mm (1 to
2 in)/sec.

CHECKING PROCEDURE

Check that there is no refrigerant vapor, shop chemicals, or cigarette smoke in the vicinity of the vehicle to pre-
vent inaccurate or false readings. Perform the leakage test in calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.

Stop the engine.

AHA281A

JSIIA1099GB

SHA706E

SHA708EA

HA-30

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ELECTRICAL LEAK DETECTOR

Connect a suitable manifold gauge set (SST: J-39183) to the A/C service valves.

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

, 50 psi) above 16

C (61

F).

Recover/evacuate and recharge the system with the specified amount of refrigerant if less than specifica-
tion.
NOTE:
Leakages may not be detected since the system may not reach 345 kPa (3.52 kg/cm

, 50 psi) at temper-

atures below 16

C (61

F).

Perform the leakage test in the numerical as shown in the figure. [high-pressure side (compressor dis-
charge “1” to evaporator inlet “9”) to low-pressure side (evaporator drain hose “10” to shaft seal “15”)]
Clean the component to be checked and move the leakage detected probe completely around the con-
nection/component.

NOTE:
Check the following carefully.

Service valves

• Check all around the service valves. Ensure service valve caps are secured on the service valves (to

prevent leakages).

• Wipe any residue from valves to prevent any false readings by leak detector after removing manifold

gauge set (SST: J-39183) from service valves.
Cooling unit (Evaporator)

• Turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in the cooling unit

with engine OFF.

• 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.

Verify at least once by blowing compressed air into area of suspected leakage, then repeat check as out-
lined above if a leak detector detects a leakage.

If a leakage is found, but continue checking for additional leakages at all system components.
When leakages are not found, go to next step.

Start the engine.

Set the A/C control as per the following;

A/C switch: ON

Air flow: VENT

JSIIA1255ZZ

ELECTRICAL LEAK DETECTOR

HA-31

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Intake door position: REC

Temperature setting: Maximum cold

Fan speed: High

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

10. Stop the engine and perform leakage check again, steps 4 – 6.

Refrigerant leakages should be checked immediately after stop-
ping the engine. Begin with the leak detector at the compressor.
The pressure on the high-pressure side drops gradually after
refrigerant circulation stops and pressure on the low-pressure
side rises gradually, as shown in the graph. Some leakages are
more easily detected when pressure is high.

11. Check recovery/recycling recharging equipment gauges before connecting recovery/recycling recharging

equipment to vehicle. No refrigerant pressure should be displayed. Recover refrigerant from equipment
lines if pressure is displayed, and then check refrigerant purity.

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

identifier.

13. Confirm refrigerant purity in vehicle A/C system using recovery/recycling recharging equipment and refrig-

erant identifier.

14. Discharge A/C system using approved refrigerant recovery equipment. Repair the leaking fitting or com-

ponent if necessary.

15. Evacuate and recharge A/C system and perform the leakage test to confirm no refrigerant leakages.

16. Perform A/C performance test to ensure system works normally.

SHA839E

HAC-1

VENTILATION, HEATER & AIR CONDITIONER

SECTION