Nissan Murano. Manual - part 798

HA-28

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REFRIGERATION SYSTEM

REFRIGERATION SYSTEM

Inspection

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1.

CHECK BLOWER MOTOR OPERATION

Check blower motor operation. Refer to 

HAC-70, "Component Function Check"

 (WITHOUT 7 INCH DIS-

PLAY) or 

HAC-196, "Component Function Check"

 (WITH 7 INCH DISPLAY).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the parts according to the inspection results.

2.

CHECK COMPRESSOR OPERATION

Check compressor operation. Refer to 

HAC-74, "Component Function Check"

 (WITHOUT 7 INCH DISPLAY)

or 

HAC-200, "Component Function Check"

 (WITH 7 INCH DISPLAY).

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the parts according to the inspection results.

3.

CHECK REFRIGERANT CYCLE PRESSURE

Connect recovery/recycling recharging equipment to the vehicle and perform the diagnosis with the gauge
pressure. Refer to 

HA-8, "Trouble Diagnosis For Unusual Pressure"

.

Is the inspection result normal?

YES

>> Perform the performance test. Refer to 

HA-28, "Performance Chart"

.

NO

>> Repair or replace the parts according to the inspection results.

Performance Chart

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TEST CONDITION

Testing must be performed under the following conditions:

TEST READING

Recirculating-to-discharge Air Temperature Table

Vehicle condition

Indoors or in the shade (in a well-ventilated place)

Doors

Closed

Door windows

Open

Hood

Open

Temperature control dial/switch

Full cold

Mode switch

 (Ventilation) set

Intake switch

 (Recirculation) set

 Fan (blower) speed

Maximum speed set

Engine speed

Idle speed

Operate the air conditioning system for 10 minutes before taking measurements.

Inside air (Recirculating air) at blower assembly inlet

Discharge air temperature at center ventilator

°

C (

°

F)

Relative humidity

%

Air temperature

°

C (

°

F)

50 - 60

20 (68)

5.9 - 7.9 (43 - 46)

25 (77)

9.6 - 12.1 (49 - 54)

30 (86)

12.8 - 15.9 (55 - 61)

60 - 70

20 (68)

7.9 - 10.0 (46 - 50)

25 (77)

12.1 - 14.6 (54 - 58)

30 (86)

15.9 - 18.9 (61 - 66)

REFRIGERATION SYSTEM

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Ambient Air Temperature-to-operating Pressure Table

*1:With the cooling fan motor low-speed control

*2:With the cooling fan motor middle-speed control

*3:With the cooling fan motor high-speed control

Refrigerant Leakages

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Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C lubricant
leakage, damage and corrosion. A/C lubricant leakage may indicate an area of refrigerant leakage. Allow
extra inspection time in these areas when using either an electrical leak detector or fluorescent dye leak
detector [refrigerant dye leak detection kit (SST: J-43926)].
Confirm the leakage with an electrical leak detector if dye is observed. It is possible a prior leakage was
repaired and not properly cleaned.
Do not stop when one leakage is found but continue checking for additional leakages at all system compo-
nents and connections when searching for leakages.
Move the probe along the suspected leakage area at 1 to 2 inches per second and no further than 1/4 inch
from the component when searching for refrigerant leakages using an electrical leak detector.

CAUTION:

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

Ambient air

High-pressure (Discharge side)

kPa (kg/cm

2

, psi)

Low-pressure (Suction side)

kPa (kg/cm

2

, psi)

Relative humidity

%

Air temperature

°

C (

°

F)

50 - 70

20 (68)

1,100 - 1,350

*1

(11.2 - 13.8, 159.5 - 195.8)

390 - 480

*1

(4.0 - 4.9, 56.6 - 69.6)

25 (77)

880 - 1,190

*2

(9.0 - 12.1, 127.6 - 172.6)

427 - 533

*2

(4.4 - 5.4, 61.9 - 77.3)

30 (86)

1,120 - 1,370

*2

(11.4 - 14.0, 162.4 - 198.7)

478 - 590

*2

(4.9 - 6.0, 69.3 - 85.6)

35 (95)

1,235 - 1,515

*2

(12.6 - 15.5, 179.1 - 219.7)

525 - 641

*2

(5.4 - 6.5, 76.1 - 93.0)

40 (104)

1,326 - 1,625

*3

(13.5 - 16.6, 192.3 - 235.6)

570 - 693

*3

(5.8 - 7.1, 82.7 - 100.5)

HA-30

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FLUORESCENT LEAK DETECTOR

FLUORESCENT LEAK DETECTOR

Inspection

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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 waste, 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, antifreeze, 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 (3.52 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 manufacturer’s operating instructions) when the A/C is operating
(compressor is 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 point of leakage and become visible.

8.

Attach a blue label if necessary.

ELECTRICAL LEAK DETECTOR

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ELECTRICAL LEAK DETECTOR

Inspection

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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 according to 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.

AHA281A

JSIIA1099GB

SHA706E

SHA708EA