Nissan Pathfinder (2006 year). Instruction — part 344
REFRIGERANT LINES
MTC-105
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D
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MTC
2006 Pathfinder
BREAK-IN OPERATION
When replacing compressor clutch assembly, always conduct the break-in operation. This is done by engag-
ing and disengaging the clutch about 30 times. Break-in operation raises the level of transmitted torque.
Removal and Installation for High-pressure Flexible A/C Hose
EJS004SG
REMOVAL
1.
Remove the front left wheel and tire assembly. Refer to
2.
Remove the front left mud guard.
3.
Remove the front left splash shield.
4.
Discharge the refrigerant. Refer to
MTC-98, "HFC-134a (R-134a) Service Procedure"
5.
Remove the high-pressure flexible A/C hose. Refer to
MTC-105, "Removal and Installation for High-pres-
.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to
CAUTION:
●
Replace the O-ring of the high-pressure flexible A/C hose with a new one, then apply compressor
oil to it for installation.
●
After charging refrigerant, check for leaks.
Removal and Installation for High-pressure A/C Pipe
EJS004SH
REMOVAL
1.
Remove the front right wheel and tire assembly. Refer to
.
2.
Remove the front right mud guard.
3.
Remove the front right splash shield.
4.
Discharge the refrigerant. Refer to
MTC-98, "HFC-134a (R-134a) Service Procedure"
5.
Remove the low pressure A/C pipe. Refer to
MTC-106, "Removal and Installation for Low-pressure A/C
6.
Remove the high-pressure A/C pipe. Refer to
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to
CAUTION:
●
Replace the O-ring of the high-pressure A/C pipe with a new one, then apply compressor oil to it
for installation.
●
After charging refrigerant, check for leaks.
Removal and Installation for Low-pressure Flexible A/C Hose
EJS004SI
REMOVAL
1.
Remove the front right wheel and tire assembly. Refer to
.
2.
Remove the front right mud guard.
3.
Remove the front right splash shield.
4.
Discharge the refrigerant. Refer to
MTC-98, "HFC-134a (R-134a) Service Procedure"
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
5.
Remove the low-pressure flexible A/C hose. Refer to
MTC-105, "Removal and Installation for Low-pres-
.
INSTALLATION
Installation is in the reverse order of removal.
MTC-106
REFRIGERANT LINES
2006 Pathfinder
.
CAUTION:
●
Replace the O-ring of the low-pressure flexible A/C hose with a new one, then apply compressor
oil to it for installation.
●
After charging refrigerant, check for leaks.
Removal and Installation for Low-pressure A/C Pipe
EJS004SJ
REMOVAL
1.
Discharge the refrigerant. Refer to
MTC-98, "HFC-134a (R-134a) Service Procedure"
2.
Remove the low-pressure A/C pipe. Refer to
.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to
.
CAUTION:
●
Replace the O-ring of the low-pressure A/C pipe with a new one, then apply compressor oil to it for
installation.
●
After charging refrigerant, check for leaks.
Removal and Installation for Refrigerant Pressure Sensor
EJS004SK
REMOVAL
1.
Discharge the refrigerant. Refer to
MTC-98, "HFC-134a (R-134a) Service Procedure"
2.
Disconnect the refrigerant pressure sensor harness connector
and remove the refrigerant pressure sensor from the condenser.
CAUTION:
Be careful not to damage the condenser fins.
INSTALLATION
Installation is in the reverse order of removal.
Refer to
.
CAUTION:
●
Replace the O-ring of the refrigerant pressure sensor with a new one, then apply compressor oil to
it for installation.
●
Be careful not to damage the condenser fins.
●
After charging refrigerant, check for leaks.
Removal and Installation for Condenser
EJS004SL
REMOVAL
1.
Discharge the refrigerant. Refer to
MTC-98, "HFC-134a (R-134a) Service Procedure"
2.
.
CAUTION:
Be careful not to damage the core surface of the condenser and the radiator.
3.
Disconnect the high-pressure flexible A/C hose and the high-pressure A/C pipe from the condenser.
CAUTION:
Cap or wrap the joint of the pipes with suitable material such as vinyl tape to avoid the entry of air.
LJIA0177E
REFRIGERANT LINES
MTC-107
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MTC
2006 Pathfinder
4.
Disconnect the refrigerant pressure sensor harness connector.
5.
Remove the refrigerant pressure sensor from the condenser.
6.
Lift the condenser out of the mounting grommets and remove
the condenser.
INSTALLATION
Installation is in the reverse order of removal.
Refer to
CAUTION:
●
Replace the O-rings of the high-pressure A/C pipe, refrigerant pressure sensor, and high-pressure
flexible A/C hose with new ones, then apply compressor oil to them for installation.
●
After charging refrigerant, check for leaks.
●
Replace the mounting grommets as necessary.
LJIA0177E
MTC-108
REFRIGERANT LINES
2006 Pathfinder
Removal and Installation for Evaporator
EJS004SM
Heater and Cooling Unit Assembly
LJIA0178E
1.
Center ventilator connector duct
2.
Heater core cover
3.
Intake air case
4.
Heater core and evaporator pipes
bracket
5.
Heater core and evaporator pipes
grommet
6.
Heater core
7.
Upper heater and cooling unit case
8.
Expansion valve
9.
Evaporator
10. Lower heater and cooling unit case
11.
Blower motor resistor
12. Blower motor
REFRIGERANT LINES
MTC-109
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MTC
2006 Pathfinder
REMOVAL
1.
Remove the heater core. Refer to
.
2.
Separate the heater and cooling unit case.
3.
Remove the evaporator.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Replace the O-rings on the A/C low-pressure flexible A/C hose and the high-pressure A/C pipe with
new ones. Apply compressor oil to the O-rings for installation.
Removal and Installation for Expansion Valve
EJS004SN
REMOVAL
1.
Discharge the refrigerant. Refer to
MTC-98, "HFC-134a (R-134a) Service Procedure"
2.
Remove the heater and cooling unit assembly. Refer to
MTC-87, "HEATER & COOLING UNIT ASSEM-
.
3.
Remove the heater core and evaporator pipes grommet.
4.
Remove the expansion valve.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
●
Replace the O-rings on then expansion valve and the A/C refrigerant pipes with new ones, then
apply compressor oil to them for installation.
●
After charging refrigerant, check for leaks.
Checking for Refrigerant Leaks
EJS004SO
Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C oil leak-
age, damage, and corrosion. Any A/C oil leakage may indicate an area of refrigerant leakage. Allow extra
inspection time in these areas when using either an electronic refrigerant leak detector (J-41995) or fluores-
cent dye leak detector (J-42220).
If any dye is observed using a fluorescent dye leak detector (J-42220), confirm the leak using a electronic
refrigerant leak detector (J-41995). It is possible that the dye is from a prior leak that was repaired and not
properly cleaned.
When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all
system components and connections.
When searching for refrigerant leaks using an electronic refrigerant leak detector (J-41995), move the probe
along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the
component.
CAUTION:
Moving the electronic refrigerant leak detector probe slower and closer to the suspected leak area will
improve the chances of finding a leak.
Checking System for Leaks Using the Fluorescent Dye Leak Detector
EJS004SP
1.
Check the A/C system for leaks using the fluorescent dye leak detector and safety goggles (J-42220) in a
low sunlight area (area without windows preferable). Illuminate all components, fittings and lines. The dye
will appear as a bright green/yellow area at the point of leakage. Fluorescent dye observed at the evapo-
rator drain opening indicates an evaporator core assembly leak (tubes, core or expansion valve).
2.
If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, then inspect the shop rag or cloth with the fluorescent dye leak detector (J-42220) for dye residue.
3.
After the leak is repaired, remove any residual dye using refrigerant dye cleaner (J-43872) to prevent
future misdiagnosis.
Expansion valve bolts
: Refer to
.
A/C refrigerant pipe to expansion valve bolt
: Refer to
.
MTC-110
REFRIGERANT LINES
2006 Pathfinder
4.
Perform a system performance check and then verify the leak repair using a electronic refrigerant leak
detector (J-41995).
NOTE:
●
Other gases in the work area or substances on the A/C components, for example, anti-freeze, wind-
shield washer fluid, solvents and oils, may falsely trigger the leak detector. Make sure the surfaces to
be checked are clean.
●
Clean with a dry cloth or blow off with shop air.
●
Do not allow the sensor tip of the electronic refrigerant leak detector (J-41995) to contact with any sub-
stance. This can also cause false readings and may damage the detector.
Dye Injection
EJS004SQ
NOTE:
This procedure is only necessary when recharging the system or when the compressor has seized and must
be replaced.
1.
Check the A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg/cm
2
, 50 psi).
2.
Pour one bottle 7.4 cc (1/4 ounce) of the HFC-134a (R-134a) fluorescent leak detection dye (J-41447) into
the HFC-134a (R-134a) refrigerant dye injector (J-41459).
CAUTION:
If repairing the A/C system or replacing a component, pour the HFC-134a (R-134a) fluorescent leak
detection dye (J-41447) directly into the open system connection and proceed with the service
procedures.
3.
Connect the refrigerant dye injector (J-41459) to the low-pressure service valve.
4.
Start the engine and switch the A/C system ON.
5.
When the A/C system is operating (compressor running), inject one bottle 7.4 cc (1/4 ounce) of HFC-134a
(R-134a) fluorescent leak detection dye (J-41447) through the low-pressure service valve using HFC-
134a (R-134a) refrigerant dye injector (J-41459). Refer to the manufacturer's operating instructions.
6.
With the engine still running, disconnect the HFC-134a (R-134a) refrigerant dye injector (J-41459) from
the low-pressure service valve.
7.
Operate the A/C system for a minimum of 20 minutes to mix the HFC-134a (R-134a) fluorescent leak
detection dye (J-41447) with the A/C system oil. Depending on the leak size, operating conditions and
location of the leak, it may take from minutes to days for the HFC-134a (R-134a) fluorescent leak detec-
tion dye to penetrate an A/C system leak and become visible.
Electronic Refrigerant Leak Detector
EJS004SR
PRECAUTIONS FOR HANDLING LEAK DETECTOR
NOTE:
When performing a refrigerant leak check, use a electronic refrigerant leak detector (J-41995) or equivalent.
Ensure that the electronic refrigerant leak detector (J-41995) is calibrated and set properly according to the
manufacturer's operating instructions.
The electronic refrigerant leak detector (J-41995) is a delicate
device. To use the electronic refrigerant leak detector (J-41995)
properly, read the manufacturer's operating instructions and perform
any specified maintenance.
AHA281A
REFRIGERANT LINES
MTC-111
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MTC
2006 Pathfinder
1.
Position the probe approximately 5 mm (3/16 in) away from the
point to be checked as shown.
2.
When checking for leaks, circle each fitting completely with the
probe as shown.
3.
Move the probe along each component at a speed of approxi-
mately 25 - 50 mm (1 - 2 in)/second as shown.
CHECKING PROCEDURE
NOTE:
To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette
smoke in the vicinity of the vehicle. Perform the leak test in a calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.
1.
Turn the engine OFF.
2.
Connect the manifold gauge set (J-39183-C) to the A/C service ports. Refer to
3.
Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm
2
, 50 psi) above a temperature of
16
°
C (61
°
F). If less than specification, recover/evacuate and recharge the system with the specified
amount of refrigerant. Refer to
MTC-98, "HFC-134a (R-134a) Service Procedure"
NOTE:
At temperatures below 16
°
C (61
°
F), leaks may not be detected since the system may not reach 345 kPa
(3.52 kg/cm
2
, 50 psi) pressure.
4.
Perform the leak test from the high-pressure side (A/C compressor discharge “a” to evaporator inlet “f”) to
the low-pressure side (A/C evaporator drain hose “g” to shaft seal “k”). Refer to
. Clean the component to be checked and carefully move the electronic refrigerant leak detector probe
completely around the following connections and components.
●
Check the compressor shaft seal
●
Check the high and low-pressure pipe and hose fittings, relief valve, and compressor shaft seal
●
Check the liquid tank
SHA707EA
SHA706E
SHA708EA
MTC-112
REFRIGERANT LINES
2006 Pathfinder
●
Check the refrigerant pressure sensor
●
Check all around the service valves. Check that the service valve caps are screwed tightly on the ser-
vice valves (to prevent leaks).
NOTE:
After removing manifold gauge set (J-39183-C) from the service valves, wipe any residue from the ser-
vice valves to prevent any false readings by the electronic refrigerant leak detector (J-41995).
●
Evaporator
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in
the heater and cooling unit assembly. Wait a minimum of 10 minutes accumulation time (refer to the
manufacturer's recommended procedure for actual wait time) before inserting the electronic refrigerant
leak detector probe into the heater and cooling unit assembly drain hose.
NOTE:
Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with
water or dirt that may be in the drain hose.
5.
If a leak is detected, verify at least once by blowing compressed air into the area of the suspected leak,
then repeat the leak check.
6.
Do not stop when one leak is found. Continue to check for additional leaks at all system components and
connections.
7.
If no leaks are found, perform steps 8 - 11.
8.
Start the engine.
9.
Set the heater A/C controls as follows:
a.
A/C switch: ON
b.
Air flow: VENT mode
c.
Intake position: RECIRCULATION mode
d.
Temperature: MAX cold
e.
Blower fan speed: HIGH
10. Run the engine at 1,500 rpm for at least 2 minutes.
11. Turn the engine OFF and perform the leak check again following
steps 4 through 6 above.
Refrigerant leaks should be checked immediately after turning
the engine OFF. Begin with the leak detector at the compressor.
The pressure on the high pressure side will gradually drop after
the refrigerant circulation stops and pressure on the low pres-
sure side will gradually rise, as shown in the graph. Some leaks
are more easily detected when the pressure is high.
12. Before connecting the recovery/recycling equipment to the vehicle, check the recovery/recycling equip-
ment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover the refriger-
ant from the equipment lines and then check the refrigerant purity.
13. Confirm refrigerant purity in supply tank using recovery/recycling equipment and refrigerant identifier
equipment (J-41810-NI).
14. Confirm the refrigerant purity in the vehicle's A/C system using recovery/recycling equipment and refriger-
ant identifier equipment (J-41810-NI).
15. Discharge the A/C system using recovery/recycling equipment. Repair the leaking fitting or component as
necessary.
16. Evacuate and recharge the A/C system and perform the leak test to confirm that there are no refrigerant
leaks.
17. Conduct the Operational Check to ensure system works properly. Refer to
SHA839E
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