2011 INFINITI QX56 Factory Service Manual

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Page 3081 of 5598

INFINITI QX56 2011 Factory Service Manual
PERFORMANCE TESTHA-25
< BASIC INSPECTION >
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PERFORMANCE TEST
InspectionINFOID:0000000006276158
INSPECTION PROCEDURE
1. Connect recovery/recycling/recharging equipment (

Page 3082 of 5598

INFINITI QX56 2011 Factory Service Manual
HA-26
< BASIC INSPECTION >
PERFORMANCE TEST
*: Measuring point of temperature is 5 mm (1.99 in) from air outlet end of rear ventilator grille A RH (passenger
room side).
AMBIENT AIR TEMPERATURE-TO-OP

Page 3083 of 5598

INFINITI QX56 2011 Factory Service Manual
REFRIGERATION SYSTEM SYMPTOMSHA-27
< SYMPTOM DIAGNOSIS >
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SYMPTOM DIAGNOSIS
REFRIGERATION SYSTEM SYMPTOMS
Trouble Diagnosis For Unusual PressureINFOID:0000000006276159

REFRIGERATION SYSTEM SYMPTOMSHA-27
< SYMPTOM DIAGNOSIS >
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SYMPTOM DIAGNOSIS
REFRIGERATION SYSTEM SYMPTOMS
Trouble Diagnosis For Unusual PressureINFOID:0000000006276159
Diagnose using a manifold gauge whenever system’s high and/or low side pressure(s) is/are unusual. The
marker above the gauge scale in the following tables i ndicates the standard (usual) pressure range. Refer to
above table (Ambient air temperature-to-operating pre ssure table) since the standard (usual) pressure, how-
ever, differs from vehicle to vehicle.
Symptom TableINFOID:0000000006276160
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too high. The pressure returns to nor-
mal soon after sprinkling wa-
ter on condenser.
Overfilled refrigerant. Collect all refrigerant, evacuate
refrigerant cycle again, and
then refill it with the specified
amount of refrigerant.
Air flow to condenser is insuf-
ficient. Insufficient condenser cooling
performance.
Poor fan rotation of radiator
and condenser.
Improper installation of air guide.
Clogged or dirty condenser fins. Repair or replace malfunc-
tioning parts.
Clean and repair condenser fins.
When compressor is stopped,
a high-pressure reading
quickly drops by approximate-
ly 196 kPa (2 kg/cm
2, 28 psi).
It then gradually decreases. Air mixed in refrigerant cycle.
Collect all refrigerant, evacuate
refrigerant cycle again, and
then refill it with the specified
amount of refrigerant.
Low-pressure pipe is cooler than the outlet of evapora-
tor.
Low-pressure pipe is frost- ed. Expansion valve opened too
much (excessive flow of refrig-
erant).
Replace expansion valve.
High-pressure side is excessively
high and low-pressure side is too
low. High-pressure pipe and upper
side of condenser become
hot, however, liquid tank does
not become so hot.Clogged or crushed high-pres-
sure pipe located between
compressor and condenser.
Repair or replace the malfunc-
tioning parts.
High-pressure side is too low and
low-pressure side is too high. The readings of both sides
become equal soon after
compressor operation
stops.
There is no temperature dif- ference between high- and
low-pressure sides. Malfunction in compressor sys-
tem (insufficient compressor
pressure operation).
Damage or breakage of
valve.
Malfunctioning gaskets. Replace compressor.
AC359A
AC360A
AC356A
Revision: 2010 May2011 QX56

Page 3084 of 5598

INFINITI QX56 2011 Factory Service Manual
HA-28
< SYMPTOM DIAGNOSIS >
REFRIGERATION SYSTEM SYMPTOMS
Both high- and low-pressure sides
are too low. The area around evapora-
tor outlet does not become
cold.
The area around evapora- tor in

Page 3085 of 5598

INFINITI QX56 2011 Factory Service Manual
NOISEHA-29
< SYMPTOM DIAGNOSIS >
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NOISE
Symptom TableINFOID:0000000006276161
Symptom Noise source Probable cause Corrective action
Unusual noise from compressor
when A

Page 3086 of 5598

INFINITI QX56 2011 Factory Service Manual
HA-30
< REMOVAL AND INSTALLATION >
COMPRESSOR
REMOVAL AND INSTALLATION
COMPRESSOR
Exploded ViewINFOID:0000000006276162
REMOVAL
DISASSEMBLY
COMPRESSOR
COMPRESSOR : Removal and InstallationINFOID:00000

Page 3087 of 5598

INFINITI QX56 2011 Factory Service Manual
COMPRESSORHA-31
< REMOVAL AND INSTALLATION >
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Perform lubricant return operati on before each refrigeration system disassembly. However, if a large
amount of refrigeran

Page 3088 of 5598

INFINITI QX56 2011 Factory Service Manual
HA-32
< REMOVAL AND INSTALLATION >
COMPRESSOR
2. Remove center bolt, and then remove clutch disc.
3. Remove snap ring using external snap ring pliers.
4. Position center pulley puller on the end of t

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