2008 INFINITI FX35 Service Manual

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Page 417 of 3924

INFINITI FX35 2008 Service Manual
ATC-12
< SERVICE INFORMATION >
PRECAUTIONS
Vehicles with factory installed fluorescent dye have the identification label on the front side of hood.
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A8

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INFINITI FX35 2008 Service Manual
PREPARATIONATC-13
< SERVICE INFORMATION >
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PREPARATION
Special Service ToolINFOID:0000000001328159
The actual shapes of Kent-Moore tools may differ fr om those of spe

Page 419 of 3924

INFINITI FX35 2008 Service Manual
ATC-14
< SERVICE INFORMATION >
PREPARATION
Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles
refrigerant and/or lubricant) are different be

Page 420 of 3924

INFINITI FX35 2008 Service Manual
PREPARATIONATC-15
< SERVICE INFORMATION >
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(J-42220)
UV lamp and UV safety goggles Power supply:
DC 12 V (Battery terminal)
For checking refrigerant leak when flu-
o

Page 421 of 3924

INFINITI FX35 2008 Service Manual
ATC-16
< SERVICE INFORMATION >
PREPARATION
Commercial Service Tool
INFOID:0000000001328161
Service couplers
High-pressure side coupler (J-39500-20)
Low-pressure side coupler (J-39500-24) Hose fit

Page 422 of 3924

INFINITI FX35 2008 Service Manual
REFRIGERATION SYSTEMATC-17
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REFRIGERATION SYSTEM
Refrigerant CycleINFOID:0000000001328162
REFRIGERANT FLOW
The refrigerant flows from the comp

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REFRIGERATION SYSTEM
Refrigerant CycleINFOID:0000000001328162
REFRIGERANT FLOW
The refrigerant flows from the compressor, through the condenser with liquid tank, through the evaporator, and
back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally equalized
expansion valve, located inside the evaporator case.
FREEZE PROTECTION
To prevent evaporator frozen up, the evaporator air te mperature is monitored, and the voltage signal to the
unified meter and A/C auto amp. will make t he A/C relay go OFF and stop the compressor.
Refrigerant System ProtectionINFOID:0000000001328163
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high- or low-pressure by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rise s above, or falls below the specifications, the refrig-
erant pressure sensor detects the pressure inside t he refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by refrigerant pressure sens or is over about 2,746 kPa (28 kg/cm
2, 398 psi), or below about 134 kPa
(1.4 kg/cm
2, 20 psi).
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system in creases to an unusual level [more than 3,727 kPa (38 kg/
cm
2, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
V-6 Variable Displacement CompressorINFOID:0000000001328164
GENERAL INFORMATION
1. The V-6 variable compressor differs from previous units. The outlet air temperatures of the V-6 variable
compressor do not drop too far below 5 °C (41 °F) when:
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Page 423 of 3924

INFINITI FX35 2008 Service Manual
ATC-18
< SERVICE INFORMATION >
REFRIGERATION SYSTEM
Evaporator intake air temperature is less than 20°C (68 °F).
Engine is running at speeds less than 1,500 rpm.
This is because the V-6 compressor

Page 424 of 3924

INFINITI FX35 2008 Service Manual
REFRIGERATION SYSTEMATC-19
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Operation
1. Control Valve
- By changing high-pressure valve lift amount, built-in electronic control valve execut

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Operation
1. Control Valve
- By changing high-pressure valve lift amount, built-in electronic control valve executes the following:
Controls high-pressure valve discharge amount.
Changes crankcase pressure in compressor.
Changes angle of wobble (swash) plate.
- Amount of high-pressure valve lift is determined by factors below.
Low-pressure applied to diaphragm
Spring load of set spring
Balance of magnetic force generated in magnet coil
- Electronic control valve (ECV) magnet coil receives
electric signal (duty control) from unified meter and A/
C amp. Then, magnetic force generated by electric cu rrent is changed to control high-pressure valve lift
amount.
2. Maximum Cooling
High-pressure valve is closed by magnetic force gener ated by electric signal sent from unified meter and
A/C amp. At this time, cylinder moves full stroke due to pressure balance between inside crankcase (Pc)
and suction line (Ps).
Under this condition, the wobble (swash) plat e is set to the maximum stroke position.
3. Capacity Control When no electric signal is sent from unified meter and A/C amp. (current: OFF), high-pressure valve is
opened by spring force.
Since suction pressure is low, it makes the su ction port close and the discharge port open. Thus, crank-
case pressure becomes high as high-pressure enters the crankcase.
- The force acts around the journal pin near the wobble (swash) plate, and is generated by the pressure dif-
ference before and behind the piston.
- The drive lug and journal pin are located where t he piston generates the highest pressure. Piston pres-
sure is between suction pressure Ps and discharge pressu re Pd, which is close to suction pressure Ps. If
crankcase pressure Pc rises due to capacity contro l, the force around the journal pin makes the wobble
(swash) plate angle decrease and also the piston stroke decrease. In other words, crankcase pressure
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