Nissan Pathfinder (2011 year). Manual — part 458
PRECAUTIONS
HAC-127
< PRECAUTION >
[AUTOMATIC AIR CONDITIONER]
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SERVICE HOSES
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shut-
off devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.
SERVICE COUPLERS
Never attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. However, if an
improper connection is attempted, discharging and contamination
may occur.
RHA272D
Shut-off valve rotation
A/C service valve
Clockwise
Open
Counterclockwise
Close
RHA273D
2011 Pathfinder
HAC-128
< BASIC INSPECTION >
[MANUAL AIR CONDITIONER]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
How to Perform Trouble Diagnosis For Quick And Accurate Repair
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WORK FLOW
1.
LISTEN TO CUSTOMER COMPLAINT
Listen to customer complaint. Get detailed information about the conditions and environment when the symp-
tom occurs.
>> GO TO 2.
2.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 3.
3.
VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to
Is the inspection result normal?
YES
>> Go to trouble diagnosis. Refer to
HAC-178, "Symptom Matrix Chart"
.
NO
>> System OK.
2011 Pathfinder
INSPECTION AND ADJUSTMENT
HAC-129
< BASIC INSPECTION >
[MANUAL AIR CONDITIONER]
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INSPECTION AND ADJUSTMENT
Operational Check
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The purpose of the operational check is to confirm that the system operates properly.
CHECKING BLOWER
1. Turn blower control dial clockwise. Blower should operate on low speed.
2. Turn the blower control dial again, and continue checking each blower speed until all speeds are checked.
3. Leave blower on speed 4.
If NG, go to trouble diagnosis procedure for
HAC-154, "Front Blower Motor Diagnosis Procedure"
If OK, continue with next check.
CHECKING DISCHARGE AIR
1. Turn the mode switch to each position.
2. Confirm that discharge air comes out according to the air distribution table. Refer to
.
Mode door position is checked in the next step.
If NG, go to trouble diagnosis procedure for
HAC-143, "Mode Door Motor (Front) Diagnosis Procedure"
.
If OK, continue with next check.
NOTE:
Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at
fresh when the DEF (
) or D/F (
) is selected.
CHECKING RECIRCULATION
1. Press recirculation (
) switch one time. Recirculation indicator should illuminate.
2. Press recirculation (
) switch one more time. Recirculation indicator should go off.
3. Listen for intake door position change (blower sound should change slightly).
If NG, go to trouble diagnosis procedure for
HAC-151, "Intake Door Motor Diagnosis Procedure"
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF or D/F is selected.
CHECKING TEMPERATURE DECREASE
1. Rotate temperature control dial counterclockwise.
2. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation if OK, go to trouble diagnosis procedure for
. If air mix door motor appears to be malfunctioning, go to
Door Motor Component Function Check"
.
If OK, continue with next check.
CHECKING TEMPERATURE INCREASE
1. Rotate temperature control dial clockwise.
2. Check for hot air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for
. If air mix door motor (front) appears to be malfunctioning, go to
Mix Door Motor Component Function Check"
.
If OK, continue with next check.
CHECK A/C SWITCH
1. Press A/C switch with the blower switch ON.
2. A/C switch indicator will turn ON.
• Confirm that the compressor clutch engages (sound or visual inspection).
Conditions
: Engine running and at normal operating temperature
2011 Pathfinder
HAC-130
< BASIC INSPECTION >
[MANUAL AIR CONDITIONER]
INSPECTION AND ADJUSTMENT
If NG, go to trouble diagnosis procedure for
HAC-160, "Magnet Clutch Diagnosis Procedure"
If OK, continue with next check.
2011 Pathfinder
FUNCTION INFORMATION
HAC-131
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
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SYSTEM DESCRIPTION
FUNCTION INFORMATION
Component Part Location
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ENGINE COMPARTMENT
WJIA1489E
2011 Pathfinder
HAC-132
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
FUNCTION INFORMATION
PASSENGER COMPARTMENT
1.
Front air control M52
2.
Intake sensor M146
3.
Intake door motor M58
4.
Front blower motor resistor M121
5.
Mode door motor M144
6.
Air mix door motor (front) M149
AWIIA1194GB
2011 Pathfinder
FUNCTION INFORMATION
HAC-133
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
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Symptom Table
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Symptom
Reference Page
A/C system does not come on.
Go to Trouble Diagnosis Procedure for A/C System.
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor.
Mode door motor is malfunctioning.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
Air mix door motor is malfunctioning.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor.
Intake door motor is malfunctioning.
Front blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Front Blower Motor.
Magnet clutch does not engage.
Go to Trouble Diagnosis Procedure for Magnet Clutch.
Insufficient cooling
Go to Trouble Diagnosis Procedure for Insufficient Cooling.
Insufficient heating
Go to Trouble Diagnosis Procedure for Insufficient Heating.
Noise
Go to Trouble Diagnosis Procedure for Noise.
2011 Pathfinder
HAC-134
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM
Refrigerant Cycle
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REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the front and rear evaporators, and back to the compressor. The refrigerant evaporation through the
evaporator coils are controlled by front and rear externally equalized expansion valves, located inside the front
and rear evaporator cases.
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
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REFRIGERANT PRESSURE SENSOR
WJIA1342E
2011 Pathfinder
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