Nissan Murano Z51. Instruction — part 828
HA-28
< PERIODIC MAINTENANCE >
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM
Inspection
INFOID:0000000005514532
1.
CHECK BLOWER MOTOR OPERATION
Check blower motor operation. Refer to
HAC-69, "Component Function Check"
(WITHOUT 7 INCH DIS-
PLAY) or
HAC-191, "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-73, "Component Function Check"
(WITHOUT 7 INCH DISPLAY)
or
HAC-195, "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
.
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
Maximum 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
HA-29
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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
INFOID:0000000005514534
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
< PERIODIC MAINTENANCE >
FLUORESCENT LEAK DETECTOR
FLUORESCENT LEAK DETECTOR
Inspection
INFOID:0000000005514535
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
HA-31
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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
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