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Nissan Qashqai (2007-2010). Manual - part 891

HA-134

< ON-VEHICLE MAINTENANCE >

[MANUAL AIR CONDITIONER (HR/MR)]

FLUORESCENT LEAK DETECTOR

FLUORESCENT LEAK DETECTOR

Inspection

INFOID:0000000001098159

CHECKING SYSTEM FOR LEAKS USING THE FLUORESCENT LEAK DETECTOR

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.

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.

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

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.)

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

, 50 psi).

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

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

Start the engine and switch A/C ON.

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).

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.

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.

Attach a blue label as necessary.

ELECTRICAL LEAK DETECTOR

HA-135

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[MANUAL AIR CONDITIONER (HR/MR)]

ELECTRICAL LEAK DETECTOR

Inspection

INFOID:0000000001098160

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.

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

When testing, circle each fitting completely with probe.

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.

Stop the engine.

AHA281A

SHA707EA

SHA706E

SHA708EA

HA-136

< ON-VEHICLE MAINTENANCE >

[MANUAL AIR CONDITIONER (HR/MR)]

ELECTRICAL LEAK DETECTOR

Connect a suitable A/C 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). 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

, 50 psi).

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:
After removing A/C manifold gauge set from service valves, wipe any residue from valves to prevent any
false readings by leak detector.
Cooling unit (Evaporator)

Heater & blower unit assembly

Heater & cooling unit assembly

Evaporator

O-ring

Low pressure pipe 1 and high pres-
sure pipe 2 assembly

Expansion valve

Heater sealing

Low pressure flexible hose and pipe
2

Low pressure pipe 2 fixing clamp as-
sembly

10. High pressure flexible hose

11.

Compressor

12. Low pressure flexible hose

13. Low & high pipe bracket support

14. High pressure pipe 1

15. Condenser assembly

16. Liquid tank fixing bracket

17. Refrigerant pressure sensor

18. Liquid tank

E1KIA0037GB

ELECTRICAL LEAK DETECTOR

HA-137

< ON-VEHICLE MAINTENANCE >

[MANUAL AIR CONDITIONER (HR/MR)]

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

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.

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.

Start the engine.

Set the A/C control as follows;

A/C switch: ON

MODE door position: VENT (Ventilation)

Intake door position: Recirculation

Temperature setting: Max. cold

Fan speed: High

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

10. Stop the engine 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 recovery/recycling recharging equipment to vehicle, check recovery/recycling recharg-

ing equipment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover
refrigerant from equipment lines 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 leak test to confirm no refrigerant leaks.

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

SHA839E

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