Nissan Tiida C11. Manual - part 827

REFRIGERATION SYSTEM

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tion time in these areas when using either an electronic refrigerant leak detector or fluorescent dye leak
detector.
If dye is observed, confirm the leak with an electronic refrigerant leak detector. It is possible a prior leak was
repaired and not properly cleaned.
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 electronic leak detector, move the probe along the suspected
leak area at 25 to 50 mm (1 to 2 in) per second and no further than 1/4 inch from the component.

CAUTION:

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

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FLUORESCENT LEAK DETECTOR

FLUORESCENT LEAK DETECTOR

Checking System for Leaks Using the Fluorescent Leak Detector

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1.

Check A/C system for leaks using the UV lamp and safety goggles 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 opening indi-
cates 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 J-43872 to prevent future misdiag-
nosis.

4.

Perform a system performance check and verify the leak repair with an approved electronic refrigerant
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 oils, 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

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(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 (3.45 bar, 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 J-41459.

3.

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

4.

Start 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 J-41459 (refer to the manufacture’s operat-
ing instructions).

6.

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

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.

ELECTRICAL LEAK DETECTOR

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ELECTRICAL LEAK DETECTOR

Electronic Refrigerant Leak Detector

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PRECAUTIONS FOR HANDLING LEAK DETECTOR

When performing a refrigerant leak check, use an A/C electrical leak
detector (SST) or equivalent. Ensure that the instrument is calibrated
and set properly per the operating instructions.
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) per second.

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.

Turn engine OFF.

AHA281A

SHA707EA

SHA706E

SHA708EA

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ELECTRICAL LEAK DETECTOR

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 (3.45 bar, 3.52 kg/cm

2

, 50 psi) above 16

°

C. If less

than specification, recover/evacuate and recharge the system with the specified amount of refrigerant.
NOTE:
At temperatures below 16

°

C, leaks may not be detected since the system may not reach 345 kPa (3.45

bar, 3.52 kg/cm

2

, 50 psi).

4.

Perform the leak test from the high-pressure side (compressor discharge a to evaporator inlet f) to the
low-pressure side (evaporator drain hose g to shaft seal k). Refer to 

HA-27, "Component"

. 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 high-pressure flexible hose and pipe, refrigerant pressure sensor.

• Liquid tank

Check the refrigerant connection.

• Service valves

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

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 recom-
mended 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 heater A/C control as follows;

a.

A/C switch: ON

b.

Mode control dial position: VENT (Ventilation)

c.

Intake door lever position: Recirculation

d.

Max. cold temperature

e.

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 recovery/recycling equipment to vehicle,

check recovery/recycling equipment gauges. No refrigerant
pressure should be displayed. If pressure is displayed, recover
refrigerant from equipment lines.

12. Discharge A/C system using approved refrigerant recovery/recycling equipment. Repair the leaking fitting

or component if necessary.

13. Evacuate and recharge A/C system and perform the leak test to confirm no refrigerant leaks.
14. Perform A/C performance test to ensure system works properly.

SHA839E