Nissan Teana J32. Manual - part 651

 

  Index      Nissan     Nissan Teana J32 (2008 year) - Service and Repair Manual

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  649  650  651  652   ..

 

 

Nissan Teana J32. Manual - part 651

 

 

HA-32

< ON-VEHICLE MAINTENANCE >

FLUORESCENT LEAK DETECTOR

FLUORESCENT LEAK DETECTOR

Inspection

INFOID:0000000003795981

CHECKING SYSTEM FOR LEAKAGES USING THE FLUORESCENT LEAK DETECTOR

1.

Check A/C system for leakages 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 appears 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) leakage.

2.

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

3.

Remove any residual dye using dye cleaner (SST: J-43872) to prevent future misdiagnosis after the leak-
age is repaired.

4.

Perform a system performance check and verify the leakage repair with an approved electrical leak detec-
tor.

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 may 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 (3.45 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 (SST: J-41459).

3.

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

4.

Start the engine. Then switch A/C ON.

5.

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 instructions) when the A/C operating
(compressor running).

6.

Disconnect the injector tool from the service valve with the engine still running.

CAUTION:

Be careful when replacing the A/C system or a component, pour the dye directly into the open sys-
tem 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
leakage size, operating conditions and location of the leakage, it may take from minutes to days for the
dye to penetrate a leakage and become visible.

8.

Attach a blue label if necessary.

ELECTRICAL LEAK DETECTOR

HA-33

< ON-VEHICLE MAINTENANCE >

C

D

E

F

G

H

J

K

L

M

A

B

HA

N

O

P

ELECTRICAL LEAK DETECTOR

Inspection

INFOID:0000000003795982

PRECAUTIONS FOR HANDLING LEAK DETECTOR

Use an electrical leak detector (SST) 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.

1.

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

2.

Circle each fitting completely with probe when testing.

3.

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.

1.

Stop the engine.

SHA705EB

JSIIA1099GB

SHA706E

SHA708EA

HA-34

< ON-VEHICLE MAINTENANCE >

ELECTRICAL LEAK DETECTOR

2.

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

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

(61

°

F). Recover/evacuate and recharge the system with the specified amount of refrigerant if less than

specification.
NOTE:
Leakages may not be detected since the system may not reach 345 kPa (3.45 bar, 3.52 kg/cm

2

, 50 psi) at

temperatures below 16

°

C (61

°

F).

4.

Perform the leakage 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 leakage check for the follow-
ing areas carefully. Clean the component to be checked and move the leakage 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 condenser 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 leakages).
NOTE:
Wipe any residue from valves to prevent any false readings by leak detector after removing manifold
gauge set (SST) 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.

5.

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.

6.

Do not stop when one leakage is found. Continue checking for additional leakages at all system compo-
nents.

JPIIA0988GB

ELECTRICAL LEAK DETECTOR

HA-35

< ON-VEHICLE MAINTENANCE >

C

D

E

F

G

H

J

K

L

M

A

B

HA

N

O

P

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

7.

Start the engine.

8.

Set the A/C control as per the following;

a.

A/C switch: ON

b.

Air flow: VENT (Ventilation)

c.

Intake door position: Recirculation

d.

Temperature setting: Max. cold

e.

Fan speed: High

9.

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

10. Stop the engine and perform leakage check again following

steps 4 through 6 above.
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.

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

ponent if necessary.

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

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

HA-30, "Performance Chart"

.

SHA839E

 

 

 

 

 

 

 

Content   ..  649  650  651  652   ..