INFINITI QX56 2009 Factory Service Manual

ELECTRICAL LEAK DETECTORHA-27
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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 t here 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 HA-20, "HFC-134a (R-
134a) Service Procedure".
3. Check if the A/C refrigerant pressu re 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/ev acuate and recharge the system with the specified
amount of refrigerant. Refer to HA-20, "HFC-134a (R-134a) Service Procedure"
.
NOTE:
At temperatures below 16 °C (61 °F), leaks may not be detected sinc e 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 (f ront A/C compressor discharge “a” to evaporator inlet
“f” or rear piping connection “l”) to the low-pressure side (front A/C evaporator drain hose “g” to shaft seal
“k” and rear A/C evaporator drain hose “o” to piping connection “r”). Refer to HA-29, "Component"
. 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 fitt ings, relief valve, and compressor shaft seal
 Check the liquid tank
 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 t he 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:
SHA706E
SHA708EA
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HA-28
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ELECTRICAL LEAK DETECTOR
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 blow ing 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 c heck 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: NOTE:
For the automatic system, turn OF F the automatic controls and set the heater A/C controls manually.
a. A/C switch to ON
b. Air flow to VENT mode
c. Intake position to RECIRCULATION mode
d. Temperature to MAX cold
e. Blower fan speed to 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 ens ure system works properly. Refer to HAC-109,
"Symptom Matrix Chart" and HAC-111, "Diagnostic Work Flow".
SHA839E
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REFRIGERATION SYSTEMHA-29
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ON-VEHICLE REPAIR
REFRIGERATION SYSTEM
ComponentINFOID:0000000003775308
Front A/C System
ALIIA0402ZZ
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HA-30
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REFRIGERATION SYSTEM
Rear A/C System
NOTE:
Refer to HA-5, "Precaution for Refrigerant Connection"
.
1. High-pressure service valve 2. Grommet 3. High-pressure pipe
4. Refrigerant pressure sensor 5. Condenser 6. Compressor shaft seal
7. High-pressure flexible hose 8. Low-pressure flexible hose 9. Low-pressure service valve
10. Low-pressure pipe 11. Expansion valve (front) 12. Drain hose
13. Dryer & liquid tank 14. Liquid tank bracket 15. Junction pipe
Vehicle front
AWIIA0134GB
1. Rear heater and cooling unit assembly 2. Rear A/C pipes 3. Rear A/C heater core pipes
4. Rear heater core hose 5. Rear blower motor 6. Underfloor rear A/C pipes
7. Underfloor rear heater core pipes A. Bolt torque specification B. Leak checking order (l - r)
C. Tightening torque D. Wrench size E. O-ring size
⇐Front
NOTE: The O-ring size 8 is the high-side and the O-ring size 16 is the low-side.
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COMPRESSORHA-31
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COMPRESSOR
Removal and Installation for CompressorINFOID:0000000003775309
A/C Compressor Mounting
REMOVAL
1. Discharge the refrigerant. Refer to HA-20, "HFC-134a (R-134a) Service Procedure".
2. Remove the front left wheel and tire assembly. Refer to WT-41, "Adjustment"
.
3. Remove the engine under cover.
4. Remove front fender protector. Refer to EXT-23, "Removal and Installation"
.
5. Remove the engine air cleaner and air ducts. Refer to EM-25, "Removal and Installation"
.
6. Remove the drive belt. Refer to EM-13, "Removal and Installation"
.
7. Disconnect the compressor electrical connector.
8. Disconnect the high-pressure flexible hose and low-pressure flexible hose from the compressor. CAUTION:
Cap or wrap the joint of the pipe with suitable mate rial such as vinyl tape to avoid the entry of air.
9. Remove the compressor bolts and nut using power tools.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
AWIIA1291GB
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HA-32
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COMPRESSOR
 Replace the O-rings of the low-pressure flexible hose and high-pressure flexible hose with new
ones, apply compressor oil to the O-rings when installing them.
 After recharging the A/C system with refrigerant, check for leaks.
Removal and Installation for Compressor ClutchINFOID:0000000003775310
Magnet Clutch Assembly
REMOVAL
1. Remove the compressor. Refer to HA-31, "Removal and Installation for Compressor".
2. Remove the center bolt while holding the clutch disc stationary using Tool as shown.
3. Remove the clutch disc and shims. CAUTION:
Retain all of the shims for installation.
4. Remove the snap ring using a suitable tool.
AWIIA1286GB
1. Magnet clutch assembly 2. Magnet coil 3. Pulley
4. Clutch disc 5. Snap ring 6. Thermal protector (built in)
7. Compressor
Tool number : — (J-44614)
WHA228
RHA072C
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COMPRESSORHA-33
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5. Remove the pulley using suitable tool (A). CAUTION:
To prevent deformation of th e pulley groove, the puller
claws should be hooked un der the pulley groove and not
into the pulley groove.
6. Remove the three magnet coil screws using a suitable tool and remove the magnet coil.
INSPECTION
Clutch Disc
If the contact surface shows si gns of damage due to excessive heat,
replace clutch disc and pulley.
Pulley
Check the appearance of the pulley assembly. If contact surface of pulley shows signs of excessive grooving,
replace clutch disc and pulley. The contact surfaces of the pulley assembly should be cleaned with a suitable
solvent before reinstallation.
Coil
Check magnet coil for loose connections or any cracked insulation.
INSTALLATION
1. Install the magnet coil. CAUTION:
Be sure to align the magnet co il pin with the hole in the
compressor front head.
AWIIA1285ZZ
WHA212
WHA183
WHA213
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HA-34
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COMPRESSOR
2. Install the pulley assembly using Tool and a wrench, then installthe snap ring using a suitable tool.
3. Install the clutch disc on the compressor shaft, together with all the original shim(s) using a suitabl e tool. Press the clutch disc in
by hand.
4. Install the clutch pulley bolt while using Tool to prevent the clutch
disc from turning and tighten the bolt to specification.
CAUTION:
After tightening the clutch pu lley bolt, check that the clutch
pulley rotates smoothly.
5. Check the pulley clearance all the way around the clutch disc as shown.
6. If the specified clearance is not obtained, replace the adjusting spacer to readjust.
7. Install the compressor. Refer to HA-31, "Removal and Installa-
tion for Compressor".
Tool number : — (J-38873-A)
WJIA1016E
WHA184
Tool number : — (J-44614)
WHA229
Clutch disc-to-pulley clearance : 0.3 - 0.6 mm
(0.012 - 0.024 in)
WHA194
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COMPRESSORHA-35
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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.
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HA-36
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LOW-PRESSURE FLEXIBLE HOSE
LOW-PRESSURE FLEXIBLE HOSE
Removal and Installation for Low-Pressure Flexible HoseINFOID:0000000003775311
REMOVAL
1. Remove the engine air cleaner and air ducts. Refer to EM-25, "Removal and Installation".
2. Discharge the refrigerant. Refer to HA-20, "HFC-134a (R-134a) Service Procedure"
.
3. Remove the low-pressure flexible hose. CAUTION:
Cap or wrap the joint of the pipe with suitable mate rial such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to HA-29, "Component"
.
CAUTION:
 Replace the O-ring of the low-pr essure flexible hose with a new one, then apply compressor oil to it
when installing it.
 After charging refrigerant, check for leaks.
Revision: December 20092009 QX56