2011 INFINITI QX56 Factory Service Manual

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Page 3073 of 5598

INFINITI QX56 2011 Factory Service Manual
DIAGNOSIS AND REPAIR WORKFLOWHA-17
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>> GO TO 2.
2.SYMPTOM CHECK
Check the symptom from the customers information. Check that any symptom occurs o

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INFINITI QX56 2011 Factory Service Manual
HA-18
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REFRIGERANT
REFRIGERANT
DescriptionINFOID:0000000006276149
CONNECTION OF SERVICE TOOLS AND EQUIPMENT
Leak TestINFOID:0000000006276150
CHECK REFRIGERANT LEAKAGE USING FLUORE

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INFINITI QX56 2011 Factory Service Manual
REFRIGERANTHA-19
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Never look directly into UV lamp light source.
NOTE:
For continuous operating time of UV lamp, fo llow the manufacturer operati

REFRIGERANTHA-19
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Never look directly into UV lamp light source.
NOTE:
For continuous operating time of UV lamp, fo llow the manufacturer operating instructions.
Illuminate piping joints from different angles us ing UV lamp and check that there is no leakage.
Use a mirror in area that is difficult to see to check refrigerant leakage.
Refrigerant leakage from evaporator can be detected by soaking cotton swab or a similar material with
drain hose water and illuminating it using UV lamp.
Dust, dirt, and packing materials adhesive used for condenser, evaporator, and other locations may flu- oresce. Be careful not to misidentify leakage.
5. Repair or replace parts where refrigerant leak age occurs and wipe off fluorescent leak detection dye.
NOTE:
Completely wipe off fluorescent leak detection dy e from gaps between parts, screw threads, and others
using a cotton swab or similar materials.
6. Use a UV lamp to check that no fluorescent leak detection dye remains after finishing work. WARNING:
Never look directly into UV lamp light source.
NOTE:
For continuous operating time of UV lamp, fo llow the manufacturer operating instructions.
Dust, dirt, and packing materials adhesive used for condenser, evaporator, and other locations may flu-
oresce. Be careful not to misidentify leakage.
CHECK REFRIGERANT LEAKAGE USIN G ELECTRICAL LEAK DETECTOR
WARNING:
Never check refrigerant leakage while the engine is running.
CAUTION:
Be careful of the following items so that in accurate checks or misidentifications are avoided.
Never allow refrigerant vapor, shop chemical vapors, cigarette smoke, or others around the vehicle.
Always check refrigerant leakage in a low air flow environment so that refrigerant may not disperse
when leakage occurs.
1. Stop the engine.
2. Connect recovery/recycling/recharging equipment or manifold gauge set to A/C service valve.
3. Check that A/C refrigerant pressure is 345 kPa (3.52 kg/cm
2, 50 psi) or more when temperature is 16 °C
(61 °F) or more. When pressure is lower than the spec ified value, recycle refrigerant completely and fill
refrigerant to the specified level.
NOTE:
Leakages may not be detected if A/C refri gerant pressure is 345 kPa (3.52 kg/cm
2, 50 psi) or less when
temperature is less than 16 °C (61 °F).
4. Clean area where refrigerant leakage check is per formed, and check refrigerant leakage along all sur-
faces of pipe connections and A/C system com ponents using electrical leak detector probe.
CAUTION:
Continue checking when a leakage is found. Always continue and complete checking along all
pipe connections and A/C system co mponents for additional leakage.
When a leakage is detected, clean leakage area using compressed air and check again.
When checking leakage of cooling unit inside, al ways clean inside of drain hose so that the
probe surface may not be exposed to water or dirt.
NOTE:
Always check leakage starting from high-pressure side and continue to low-pressure side.
When checking leakage of cooling unit inside, operate blower fan motor for 15 minutes or more at the maximum fan speed while the engine is stopped, and then insert electrical leak detector probe into drain
hose and hold for 10 minutes or more.
When disconnecting shut-off valve that is connected to A/C service valve, always evacuate remaining
refrigerant so that misidentification can be avoided.
5. Repair or replace parts where refrigerant leak age is detected. (Leakage is detected but leakage area is
unknown. GO TO 6.)
6. Start the engine and set A/C control in the following conditions. A/C switch ON
Air flow: VENT (ventilation)
Intake door position: Recirculation
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
HA-20
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REFRIGERANT
Temperature setting: Full cold
Fan speed: Maximum speed set
7. Run the engine at approximately 1,500 rpm for 2 minutes or more.
8. Stop the engine. Check ag

HA-20
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REFRIGERANT
Temperature setting: Full cold
Fan speed: Maximum speed set
7. Run the engine at approximately 1,500 rpm for 2 minutes or more.
8. Stop the engine. Check again for refrigerant leakage. GO TO 4.
WARNING:
Be careful not to get burned when the engine is hot.
NOTE:
Start refrigerant leakage check immediately after the engine is stopped.
When refrigerant circulation is stopped, pressure on the low-
pressure side rises gradually, and after this, pressure on the
high-pressure side falls gradually.
The higher the pressure is, the easier it is to find the refriger-
ant leakage.
Recycle RefrigerantINFOID:0000000006276151
WARNING:
Always use HFC-134a for A/C refrigerant. If CFC-12 is accidentally charged, compressor is damaged
due to insufficient lubrication.
Always observe and follow precaution s described on refrigerant container. Incorrect handling may
result in an explosion of refrigerant co ntainer, frostbite, or the loss of eyesight.
Never breathe A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose, or
throat.
Never allow HFC-134a to be exposed to an open flam e or others because it generates poisonous gas
when in contact with high temperature ob jects. Keep workshop well ventilated.
1. Perform lubricant return operation. Refer to HA-22, "
Perform Lubricant Return Operation". (If refrigerant or
lubricant leakage is detected in a large am ount, omit this step, and then GO TO 2.)
CAUTION:
Never perform lubricant return op eration if a large amount of refrigerant or lubricant leakage is
detected.
2. Check gauge pressure readings of recovery/recyc ling/recharging equipment. When remaining pressure
exists, recycle refrigerant from high-pressure hose and low-pressure hose.
NOTE:
Follow manufacturer instructions for the handling or maintenance of the equipment. Never fill the equip-
ment with non-specified refrigerant.
3. Remove A/C service valve cap from the vehicle.
4. Connect recovery/recycling/rechargi ng equipment to A/C service valve.
5. Operate recovery/recycling/recharging equipm ent, and recycle refrigerant from the vehicle.
6. Evacuate air for 10 minutes or more to remove any remaining refrigerant integrated to compressor lubri-
cant, etc.
7. Refrigerant recycle operation is complete.
Charge RefrigerantINFOID:0000000006276152
WARNING:
Always use HFC-134a for A/C refrigerant. If CFC-12 is accidentally charged, compressor is damaged
due to insufficient lubrication.
Always observe and follow precaution s described on refrigerant container. Incorrect handling may
result in an explosion of refrigerant co ntainer, frostbite, or the loss of eyesight.
Never breathe A/C refrigerant and lubricant vapor or mist. Exposure my irritate eyes, nose, or throat.
Never allow HFC-134a to be exposed to an open flam e or others because it generates poisonous gas
when in contact with high temperature ob jects. Keep workshop well ventilated.
1. Connect recovery/recycling/recharging equipment to the A/C service valve.
SHA839E
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
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2. Operate recovery/recycling/recharging equipment, and evacuate air from A/C system for 25 minutes or
more.
CAUTION:
Evacuate a

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INFINITI QX56 2011 Factory Service Manual
HA-22
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LUBRICANT
LUBRICANT
DescriptionINFOID:0000000006276153
MAINTENANCE OF LUBRICANT LEVEL
The compressor lubricant is circulating in the system together with the refrigerant. I

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INFINITI QX56 2011 Factory Service Manual
LUBRICANTHA-23
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Lubricant Adjusting Procedur e for Compressor ReplacementINFOID:0000000006276157
1. Drain lubricant from removed compressor and mea

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INFINITI QX56 2011 Factory Service Manual
HA-24
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LUBRICANT
Example: Lubricant amount to be drained from a new compressor when replacing compressor and liquid
tank [m (Imp fl oz.)] [D = 60 (2.1), α = 5 (0.2)]
210 (7.2)

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