Nissan Qashqai (2007-2010). Manual - part 878

HA-82

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[AUTOMATIC AIR CONDITIONER (K9K)]

REFRIGERATION SYSTEM

When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all
system components and connections.
When searching for refrigerant leaks using an electrical leak detector, move the probe along the suspected
leak area at 1 to 2 inches per second and no further than 1/4 inch from the component.

CAUTION:

Moving the electrical leak detector probe slower and closer to the suspected leak area will improve the
chances of finding a leak.

FLUORESCENT LEAK DETECTOR

HA-83

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[AUTOMATIC AIR CONDITIONER (K9K)]

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FLUORESCENT LEAK DETECTOR

Inspection

INFOID:0000000001093907

CHECKING SYSTEM FOR LEAKS USING THE FLUORESCENT LEAK DETECTOR

1.

Check A/C system for leaks using the UV lamp and safety goggles (SST: J-42220) in a low sunlight area
(area without windows preferable). Illuminate all components, fittings and lines. The dye will appear as a
bright green/yellow area at the point of leakage. Fluorescent dye observed at the evaporator drain open-
ing indicates an evaporator core assembly (tubes, core or expansion valve) leak.

2.

If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, with the UV lamp for dye residue.

3.

After the leak is repaired, remove any residual dye using dye cleaner (SST: J-43872) to prevent future
misdiagnosis.

4.

Perform a system performance check and verify the leak repair with an approved electrical leak detector.

NOTE:
Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield
washer fluid, solvents and lubricants, may falsely trigger the leak detector. Make sure the surfaces to be
checked are clean.
Clean with a dry cloth or blow off with shop air.
Do not allow the sensor tip of the detector to contact with any substance. This can also cause false readings
and may damage the detector.

DYE INJECTION

(This procedure is only necessary when recharging the system or when the compressor has seized and was
replaced.)

1.

Check A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg/cm

2

, 50 psi).

2.

Pour one bottle (1/4 ounce / 7.4 cc) of the A/C refrigerant dye into the injector tool (SST: J-41459).

3.

Connect the injector tool to the A/C low-pressure side service valve.

4.

Start the engine and switch A/C ON.

5.

When the A/C operating (compressor running), inject one bottle (1/4 ounce / 7.4 cc) of fluorescent dye
through the low-pressure service valve using dye injector tool (SST: J-41459) (refer to the manufacture’s
operating manuals).

6.

With the engine still running, disconnect the injector tool from the service valve.

CAUTION:

Be careful the A/C system or replacing a component, pour the dye directly into the open system
connection and proceed with the service procedures.

7.

Operate the A/C system for a minimum of 20 minutes to mix the dye with the system oil. Depending on the
leak size, operating conditions and location of the leak, it may take from minutes to days for the dye to
penetrate a leak and become visible.

8.

Attach a blue label as necessary.

HA-84

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[AUTOMATIC AIR CONDITIONER (K9K)]

ELECTRICAL LEAK DETECTOR

ELECTRICAL LEAK DETECTOR

Inspection

INFOID:0000000001093908

PRECAUTIONS FOR HANDLING LEAK DETECTOR

When performing a refrigerant leak check, use an electrical leak
detector (SST: J-41995) or equivalent. Ensure that the instrument is
calibrated and set properly per the operating manuals.
The leak detector is a delicate device. In order to use the leak detec-
tor properly, read the operating instructions and perform any speci-
fied maintenance.

1.

Position probe approximately 5 mm (3/16 in) away from point to
be checked.

2.

When testing, circle each fitting completely with probe.

3.

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

CHECKING PROCEDURE

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 calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.

1.

Stop the engine.

AHA281A

SHA707EA

SHA706E

SHA708EA

ELECTRICAL LEAK DETECTOR

HA-85

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2.

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

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).

4.

Perform the leak test from the high-pressure side (compressor discharge a to evaporator inlet j) to the
low-pressure side (evaporator drain hose k to shaft seal p). Perform a leak check for the following areas
carefully. Clean the component to be checked and move the leak detected probe completely around the
connection/component.

Compressor
Check the fitting of high- and low-pressure flexible hoses, relief valve and shaft seal.
Condenser
Check the fitting of condenser pipe assembly, high-pressure flexible hose and pipe.
Liquid tank
Check the fitting of radiator & condenser assembly and refrigerant pressure sensor.
Service valves
Check all around the service valves. Ensure service valve caps are secured on the service valves (to pre-
vent leaks).
NOTE:

1.

Heater sealing

2.

Expansion valve

3.

Low pressure pipe 1 and high pressure 
pipe 2 assembly

4.

Evaporator

5.

O-ring

6.

Connector pipe fixing bolt

7.

High pressure pipe 1

8.

Condenser assembly

9.

Fixing bolt

10.

Compressor

11.

Heater & cooling unit assembly

12. Heater & blower unit assembly

13.

Refrigerant pressure sensor

14.

Liquid tank

15. Liquid tank fixing screw

16.

Low pressure flexible hose

17.

Fixing bolt

18. Pipes fixing clip

19.

Low & high pressure pipe bracket

20.

Liquid tank fixing bracket

21. High pressure flexible hose

22.

Low pressure pipe 2

23.

Low pressure pipe fixing clamp as-
sembly

24. Pipe mantening clip

E1KIA0063GB