2009 INFINITI QX56 service

PREPARATIONHA-15
< PREPARATION >
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(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles) Application: For HFC-134a (R-134a)
PA G o i l
Container: 1/4 ounce (7.4cc) bottle
(Includes self-adhesive dye identifica-
tion labels for affixing to vehicle after
charging system with dye.)
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(J-41459)
HFC-134a (R-134a) Dye injector
Use with J-41447, 1/4 ounce bottle For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.
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(J-43872)
Refrigerant dye cleaner For cleaning dye spills.
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(J-39183-C)
Manifold gauge set (with hoses
and couplers) Identification:
 The gauge face indicates R-134a.
Fitting size-Thread size
 1/2”-16 ACME
Service hoses:
 High side hose (J-39500-72B)
 Low side hose
(J-39500-72R)
 Utility hose (J-39500-72Y) Hose color:
 Low side hose: Blue with black stripe
 High side hose: Red with black stripe
 Utility hose: Yellow with black stripe
or green with black stripe
Hose fitting to gauge:
 1/2”-16 ACME
Service couplers
 High side coupler (J-39500-20A)
 Low side coupler (J-39500-24A) Hose fitting to service hose:
 M14 x 1.5 fitting is optional or perma-
nently attached.
Tool number
(Kent-Moore No.)
Tool name
Description
SHA439F
SHA440F
SHA441F
RJIA0196E
S-NT201
S-NT202
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HA-16
< PREPARATION >
PREPARATION
Commercial Service Tool
INFOID:0000000003775297
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(J-39699)
Refrigerant weight scale For measuring of refrigerant
Fitting size-Thread size
 1/2”-16 ACME
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(J-39649)
Vacuum pump
(Including the isolator valve) Capacity:
 Air displacement: 4 CFM
 Micron rating: 20 microns
 Oil capacity: 482 g (17 oz)
Fitting size-Thread size
 1/2”-16 ACME
Tool number
(Kent-Moore No.)
Tool name
Description
S-NT200
S-NT203
Tool name
Description
(J-41810-NI)
Refrigerant identifier equipment (R-
134a) For checking refrigerant purity and
system contamination
Power tool Loosening bolts, screws and nuts
RJIA0197E
PIIB1407E
Revision: December 20092009 QX56

HA-20
< ON-VEHICLE MAINTENANCE >
REFRIGERATION SYSTEM
ON-VEHICLE MAINTENANCE
REFRIGERATION SYSTEM
HFC-134a (R-134a) Service ProcedureINFOID:0000000003775301
SETTING OF SERVICE TOOLS AND EQUIPMENT
Discharging Refrigerant
WARNING:
Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) refrigerant from the A/C system using certified service equipment meeting
requirements of SAE J2210 HFC-134a (R-134a) r ecycling equipment or SAE J2201 HFC-134a (R-134a)
recovery equipment. If an accidental system dischar ge occurs, ventilate the work area before resum-
ing service. Additi onal health and safety information may be ob tained from the refrigerant and oil man-
ufacturers.
Evacuating System and Charging Refrigerant
1. Shut-off valve 2. A/C service valve 3. Recovery/recycling equipment
WJIA0579E
WJIA0580E
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REFRIGERATION SYSTEMHA-21
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1. Shut-off valve 2. A/C service valve 3. Recovery/recycling equipment
4. Refrigerant container (HFC-134a) 5. Weight scale (J-39650) 6. Evacuating vacuum pump (J-39699)
7. Manifold gauge set (J-39183)
*1 HA-22, "Maintenance of Oil Quantity
in Compressor"
*3HAC-113, "Performance Chart"*5 HA-4, "Contaminated Refrigerant"
*2HAC-110, "Component Function
Check"
*4HAC-111, "Diagnostic Work Flow"
WJIA1923E
Revision: December 20092009 QX56

HA-24
< ON-VEHICLE MAINTENANCE >
FLUORESCENT LEAK DETECTOR
FLUORESCENT LEAK DETECTOR
Checking of Refrigerant LeaksINFOID:0000000003775303
PRELIMINARY CHECK
Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C oil leak-
age, damage, and corrosion. Any A/C oil leakage may indicate an area of refrigerant leakage. Allow extra
inspection time in these areas when using either an el ectronic refrigerant leak detector (J-41995) or fluores-
cent dye leak detector (J-42220).
If any dye is observed using a fluor escent dye leak detector (J-42220), c onfirm the leak using a electronic
refrigerant leak detector (J-41995). It is possible that the dye is from a prior leak that 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 electroni c refrigerant leak detector (J-41995), move the probe
along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the
component.
CAUTION:
Moving the electronic refrigerant l eak detector probe slower and clo ser to the suspected leak area will
improve the chances of finding a leak.
Checking System for L eaks Using the Fluorescent Dye Leak DetectorINFOID:0000000003775304
1. Check the A/C system for leaks using the fluorescent dye leak detector and safety goggles (J-42220) in a
low sunlight area (area without windows preferable). Il luminate 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 evapo-
rator drain opening indicates an evaporator core asse mbly leak (tubes, core or expansion valve).
2. If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, then inspect the shop rag or cloth with the fl uorescent dye leak detector (J-42220) for dye residue.
3. After the leak is repaired, remove any residual dye using refrigerant dye cleaner (J-43872) to prevent
future misdiagnosis.
4. Perform a system performance check and then verify t he leak repair using a electronic refrigerant leak
detector (J-41995).
NOTE:
 Other gases in the work area or substances on the A/C components, for example, anti-freeze, wind-
shield washer fluid, solvents and oils, may falsely tri gger 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 electronic refri gerant leak detector (J-41995) to contact with any sub-
stance. This can also cause false readings and may damage the detector.
Dye InjectionINFOID:0000000003775305
NOTE:
This procedure is only necessary when recharging t he system or when the compressor has seized and must
be replaced.
1. Check the 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 7.4 cc (1/4 ounce) of the HFC-134a (R -134a) fluorescent leak detection dye (J-41447) into
the HFC-134a (R-134a) dye injector (J-41459).
CAUTION:
If repairing the A/C system or replacing a co mponent, pour the HFC-134a (R-134a) fluorescent leak
detection dye (J-41447) directly into the open system connection and proceed with the service
procedures.
3. Connect the refrigerant dye injector (J- 41459) to the low-pressure service valve.
4. Start the engine and switch the A/C system ON.
5. When the A/C system is operating (compressor runni ng), inject one bottle 7.4 cc (1/4 ounce) of HFC-134a
(R-134a) fluorescent leak detection dye (J-41447) th rough the low-pressure service valve using HFC-
134a (R-134a) dye injector (J-41459). Refer to the manufacturer's operating instructions.
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FLUORESCENT LEAK DETECTORHA-25
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6. With the engine still running, disconnect the HFC-134a (R -134a) dye injector (J-41459) from the low-pres-
sure service valve.
7. Operate the A/C system for a minimum of 20 minut es to mix the HFC-134a (R-134a) fluorescent leak
detection dye (J-41447) with the A/C system oil. Depending on the leak size, operating conditions and
location of the leak, it may take from minutes to days for the HFC-134a (R-134a) fluorescent leak detec-
tion dye to penetrate an A/C system leak and become visible.
Revision: December 20092009 QX56

ELECTRICAL LEAK DETECTORHA-27
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2. When checking for leaks, circle each fitting completely with the probe as shown.
3. Move the probe along each component at a speed of approxi- mately 25 - 50 mm (1 - 2 in)/second as shown.
CHECKING PROCEDURE
NOTE:
To prevent inaccurate or false readings, make sure t here is no refrigerant vapor, shop chemicals, or cigarette
smoke in the vicinity of the vehicle. Perform the leak test in a calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.
1. Turn the engine OFF.
2. Connect the manifold gauge set (J-39183-C) to the A/C service ports. Refer to HA-20, "HFC-134a (R-
134a) Service Procedure".
3. Check if the A/C refrigerant pressu re is at least 345 kPa (3.52 kg/cm
2 , 50 psi) above a temperature of
16 °C (61 °F). If less than specification, recover/ev acuate and recharge the system with the specified
amount of refrigerant. Refer to HA-20, "HFC-134a (R-134a) Service Procedure"
.
NOTE:
At temperatures below 16 °C (61 °F), leaks may not be detected sinc e the system may not reach 345 kPa
(3.52 kg/cm
2 , 50 psi) pressure.
4. Perform the leak test from the high-pressure side (f ront A/C compressor discharge “a” to evaporator inlet
“f” or rear piping connection “l”) to the low-pressure side (front A/C evaporator drain hose “g” to shaft seal
“k” and rear A/C evaporator drain hose “o” to piping connection “r”). Refer to HA-29, "Component"
. Clean
the component to be checked and carefully move the electronic refrigerant leak detector probe completely
around the following connections and components.
 Check the compressor shaft seal
 Check the high and low-pressure pipe and hose fitt ings, relief valve, and compressor shaft seal
 Check the liquid tank
 Check the refrigerant pressure sensor
 Check all around the service valves. Check that the service valve caps are screwed tightly on the ser-
vice valves (to prevent leaks).
NOTE:
After removing manifold gauge set (J-39183-C) from t he service valves, wipe any residue from the ser-
vice valves to prevent any false readings by the electronic refrigerant leak detector (J-41995).
 Evaporator
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in
the heater and cooling unit assembly. Wait a minimum of 10 minutes accumulation time (refer to the
manufacturer's recommended procedure for actual wait time) before inserting the electronic refrigerant
leak detector probe into the heater and cooling unit assembly drain hose.
NOTE:
SHA706E
SHA708EA
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HA-30
< ON-VEHICLE REPAIR >
REFRIGERATION SYSTEM
Rear A/C System
NOTE:
Refer to HA-5, "Precaution for Refrigerant Connection"
.
1. High-pressure service valve 2. Grommet 3. High-pressure pipe
4. Refrigerant pressure sensor 5. Condenser 6. Compressor shaft seal
7. High-pressure flexible hose 8. Low-pressure flexible hose 9. Low-pressure service valve
10. Low-pressure pipe 11. Expansion valve (front) 12. Drain hose
13. Dryer & liquid tank 14. Liquid tank bracket 15. Junction pipe
Vehicle front
AWIIA0134GB
1. Rear heater and cooling unit assembly 2. Rear A/C pipes 3. Rear A/C heater core pipes
4. Rear heater core hose 5. Rear blower motor 6. Underfloor rear A/C pipes
7. Underfloor rear heater core pipes A. Bolt torque specification B. Leak checking order (l - r)
C. Tightening torque D. Wrench size E. O-ring size
⇐Front
NOTE: The O-ring size 8 is the high-side and the O-ring size 16 is the low-side.
Revision: December 20092009 QX56