Nissan Pathfinder (2006 year). Instruction — part 333
REFRIGERATION SYSTEM
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2006 Pathfinder
Refrigerant Cycle
EJS004R5
REFRIGERANT FLOW
The refrigerant flows in the standard pattern. Refrigerant flows through the compressor, condenser, liquid tank,
expansion valve, evaporator, and back to the compressor. The refrigerant evaporation through the evaporator
coil is controlled by an externally equalized expansion valve, located inside the evaporator case.
FREEZE PROTECTION
The compressor cycles on and off to maintain the evaporator temperature within a specified range. When the
evaporator coil temperature falls below a specified point, the intake sensor interrupts the compressor opera-
tion. When the evaporator coil temperature rises above the specification, the intake sensor allows compressor
operation.
Refrigerant System Protection
EJS004R6
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above or falls below the specifications, the refriger-
ant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM.
The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high
pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm
2
, 398 psi), or below
about 120 kPa (1.22 kg/cm
2
, 17.4 psi).
1.
Defroster nozzle
2.
LH side demister duct
3.
LH ventilator duct
4.
RH side demister duct
5.
RH ventilator duct
6.
Center ventilator duct
7.
Front heater and cooling unit assembly
8.
Floor connector duct grilles
9.
Floor connector duct
10. Front ducts
11.
Floor ducts
12. Rear console duct
13. Center console duct
14. Front console duct
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REFRIGERATION SYSTEM
2006 Pathfinder
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 increases to an abnormal level [more than 2,990 kPa (30.5 kg/
cm
2
, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant
into the atmosphere.
OIL
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OIL
PFP:KLG00
Maintenance of Oil Quantity in Compressor
EJS004R7
The oil in the compressor circulates through the system with the refrigerant. Add oil to compressor when
replacing any component or after a large refrigerant leakage has occurred. It is important to maintain the spec-
ified amount.
If oil quantity is not maintained properly, the following malfunctions may result:
●
Lack of oil: May lead to a seized compressor
●
Excessive oil: Inadequate cooling (thermal exchange interference)
OIL
Oil name: NISSAN A/C System Oil Type S or equivalent
CHECKING AND ADJUSTING
CAUTION:
If excessive oil leakage is noted, do not perform the oil return operation.
Start the engine and set the following conditions:
Test Conditions
●
Engine speed: idling to 1,200 rpm
●
A/C switch: ON
●
Blower fan speed: HIGH
●
Temperature control: optional [set so intake air temperature is 25
°
to 30
°
C (77
°
to 86
°
F)]
●
Intake position: RECIRCULATION mode
●
Perform oil return operation for about ten minutes
Adjust the oil quantity according to the following table.
Oil Adjusting Procedure for Components Replacement Except Compressor
After replacing any of the following major components, add the correct amount of oil to the system.
Amount of Oil to be Added
*1:
If refrigerant leak is small, no addition of oil is needed.
Part replaced
Oil to be added to system
Remarks
Amount of oil
m
(US fl oz, Imp fl oz)
Evaporator
75 (2.5, 2.6)
—
Condenser
75 (2.5, 2.6)
—
Liquid tank
5 (0.2, 0.2)
Add if compressor is not replaced.
In case of refrigerant leak
30 (1.0, 1.1)
Large leak
—
Small leak *1
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OIL
2006 Pathfinder
Oil Adjustment Procedure for Compressor Replacement
1.
Before connecting recovery/recycling equipment to vehicle, check recovery/recycling equipment gauges.
No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines.
2.
Connect recovery/recycling equipment to vehicle. Confirm refrigerant purity in supply tank using recovery/
recycling equipment and refrigerant identifier. If NG, refer to
MTC-4, "Contaminated Refrigerant"
3.
Confirm refrigerant purity in vehicle A/C system using recovery/recycling equipment and refrigerant identi-
fier. If NG, refer to
MTC-4, "Contaminated Refrigerant"
4.
Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure oil discharged into the
recovery/recycling equipment.
5.
Drain the oil from the “old” (removed) compressor into a graduated container and recover the amount of
oil drained.
6.
Drain the oil from the “new” compressor into a separate, clean container.
7.
Measure an amount of new oil installed equal to amount drained from “old” compressor. Add this oil to
“new” compressor through the suction port opening.
8.
Measure an amount of new oil equal to the amount recovered during discharging. Add this oil to “new”
compressor through the suction port opening.
9.
If the liquid tank also needs to be replaced, add an additional 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil at this
time.
1.
New compressor
2.
Old compressor
3.
Recovery/recycling equipment
4.
Measuring cup X
5.
Measuring cup Y
6.
New oil
A.
Drain oil from the new compressor
into clean container
B.
Record amount of oil recovered
C.
Add an additional 5 m
(0.2 US fl oz,
0.2 Imp fl oz) of new oil when replac-
ing liquid tank
D.
Install new oil equal to recorded
amounts in measuring cups X plus Y
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OIL
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2006 Pathfinder
Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor.
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AIR CONDITIONER CONTROL
2006 Pathfinder
AIR CONDITIONER CONTROL
PFP:27500
Description
EJS004R8
The front air control provides regulation of the vehicle's interior temperature. The system is based on the posi-
tion of the front air controls temperature switch selected by the driver. This is done by utilizing a microcom-
puter, also referred to as the front air control, which receives input signals from the following two sensors:
●
Intake sensor
●
PBR (position balanced resistor)
The front air control uses these signals (including the set position of the temperature switch) to control:
●
Outlet air volume
●
Air temperature
●
Air distribution
Operation
EJS004R9
AIR MIX DOOR CONTROL
The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature
control dial.
BLOWER SPEED CONTROL
Blower speed is controlled based on front blower switch settings.
When blower switch is turned, the blower motor starts and increases air flow volume each time the blower
switch is turned counterclockwise, and decreases air flow volume each time the blower switch is turned coun-
terclockwise.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOORS CONTROL
The intake doors are controlled by the recirculation switch setting, and the mode (defroster) switch setting.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode dial.
DEFROSTER DOOR CONTROL
The defroster door is controlled by the defroster dial set to defroster.
MAGNET CLUTCH CONTROL
When the A/C switch is pressed, or the mode dial is turned to the defroster position, the front air control out-
puts a compressor ON signal to BCM.
The BCM then sends a compressor ON signal to ECM, via CAN communication line.
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AIR CONDITIONER CONTROL
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ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sen-
sor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON sig-
nal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
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AIR CONDITIONER CONTROL
2006 Pathfinder
Description of Control System
EJS004RA
The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.
The relationship of these components is shown in the figure below:
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