INFINITI QX56 2006 Factory Service Manual

CO-14Revision: November 2009
RADIATOR
2006 QX56
RADIATORPFP:21400
Removal and InstallationEBS00REB
WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could occur from high-pressure
engine coolant escaping from the radiator.
REMOVAL
CAUTION:
Perform when the engine is cold.
1. Remove engine room cover. Refer to EM-12, "
Removal and Installation" .
2. Drain engine coolant from the radiator. Refer to CO-11, "
DRAINING ENGINE COOLANT" .
3. Remove air cleaner and air duct assembly. Refer to EM-15, "
Removal and Installation" .
4. Disconnect A/T fluid cooler hoses.

Install blind plug to avoid leakage of A/T fluid.
5. Disconnect radiator upper and lower hoses from radiator. CAUTION:
Do not allow coolant to contact drive belts.
WBIA0694E
1. Radiator 2. Bolt 3. Mounting rubber
4. A/T fluid cooler hose 5. Radiator hose (lower) 6. Flaps
7. Radiator shroud (upper) 8. Radiator shroud (lower) 9. Drain plug
10. Radiator hose (upper) 11. Reservoir tank hose 12. By-pass hose
13. Reservoir tank 14. Reservoir tank cap A. To radiator fill neck
B. To A/T cooler tube C. To water suction pipe D. To thermostat housing

RADIATORCO-15
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Revision: November 2009 2006 QX56
6. Remove the lower radiator shroud.

Release the tabs, pull lower radiator shroud rearwards and
down to remove.
7. Remove the radiator shroud upper bolts and remove the radiator shroud upper A.
8. Remove the A/C condenser bolts and brackets. NOTE:
Lift A/C condenser up and forward to remove from radiator.
9. Remove A/T oil cooler bolts and oil cooler from radiator and position aside.
WBIA0407E
WBIA0695E
WBIA0395E
WBIA0396E

CO-16Revision: November 2009
RADIATOR
2006 QX56
10. Lift up and remove the radiator.CAUTION:
Do not damage or scratch air conditioner condenser and
radiator core when removing.
INSTALLATION
Installation is in the reverse order of removal.
INSPECTION AFTER INSTALLATION

Check for leaks of engine coolant. Refer to CO-10, "CHECKING COOLING SYSTEM FOR LEAKS" .

Start and warm up the engine. Visually check for leaks of the engine coolant and A/T fluid.
Checking RadiatorEBS00REC
Check radiator for mud or clogging. If necessary, clean radiator as follows.
CAUTION:

Be careful not to bend or damage the radiator fins.

When radiator is cleaned without removal, remove all surrounding parts such as cooling fan, radi-
ator shroud and horns. Then tape the harness and electrical connectors to prevent water from
entering.
1. Apply water by hose to the back side of the radiator core vertically downward.
2. Apply water again to all radiator core surfaces.
3. Stop washing when dirt and debris no longer flow out from the radiator.
4. Blow air into the back side of radiator core vertically downward.

Use compressed air lower than 490 kPa (5 kg/cm2 , 71 psi) and keep distance more than 30 cm (11.8
in).
5. Blow air again into all the radiator core surfaces until no water sprays out.
PBIC1536E

ENGINE COOLING FANCO-17
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ENGINE COOLING FANPFP:21140
Removal and Installation (Crankshaft Driven Type)EBS00RED
REMOVAL
1. Remove the air duct and resonator assembly. Refer to EM-15, "Removal and Installation" .
2. Remove the engine front undercover using power tool.
3. Remove the lower radiator shroud. Refer to CO-14, "
Removal and Installation" .
4. Remove the drive belt. Refer to EM-13, "
Removal and Installation" .
5. Remove the cooling fan.
INSPECTION AFTER REMOVAL
Fan Coupling
Inspect fan coupling for oil leakage and bimetal conditions.
Fan Bracket

Visually check that there is no significant looseness in the fan
bracket shaft, and that it turns smoothly by hand.

If there are any unusual concerns, replace the cooling fan pulley.
INSTALLATION
Installation is in the reverse order of removal.

Install cooling fan with its front mark “F” facing front of engine. Refer to CO-17, "Removal and Installation
(Crankshaft Driven Type)" .
INSPECTION AFTER INSTALLATION

Check for leaks of the engine coolant. Refer to CO-10, "CHECKING COOLING SYSTEM FOR LEAKS" .
1. Cooling fan2. Fan coupling3. Fan bracket
4. Cooling fan pulley
WBIA0632E
SLC072
WBIA0418E

CO-18Revision: November 2009
ENGINE COOLING FAN
2006 QX56

Start and warm up the engine. Visually make sure that there are no leaks of the engine coolant.
Removal and Installation (Motor Driven Type)EBS00REE
REMOVAL
1. Remove front bumper. Refer to EI-13, "Removal and Installation" .
2. Disconnect harness connector from fan motor.
3. Remove the bolt and remove the fan grille and motor assembly.
INSTALLATION
Installation is in the reverse order of removal.

Cooling fan is controlled by ECM. For details, refer to EC-473, "DTC P1217 ENGINE OVER TEMPERA-
TURE" .
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WATER PUMPCO-19
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WAT E R P U MPPFP:21020
Removal and InstallationEBS00REF
CAUTION:

When removing water pump, be careful not to get engine coolant on drive belt.

Water pump cannot be disassembled and should be replaced as a unit.
REMOVAL
1. Drain engine coolant so that no engine coolant comes out from water pump fitting hole. Refer to CO-11,
"DRAINING ENGINE COOLANT" .
CAUTION:
Perform when the engine is cold.
2. Remove the engine front undercover using power tool.
3. Remove the air duct and resonator assembly. Refer to EM-15, "
Removal and Installation" .
4. Remove the drive belt. Refer to EM-13, "
Removal and Installation" .
5. Remove the water pump pulley.
6. Remove the water pump.

Engine coolant will leak from the cylinder block, so have a receptacle ready below.
CAUTION:
Handle water pump vane so that it does not contact any other parts.
INSPECTION AFTER REMOVAL

Visually check that there is no significant dirt or rust on the water
pump body and vane.

Make sure there is no looseness in the vane shaft, and that it
turns smoothly when rotated by hand.

Replace the water pump, if necessary.
INSTALLATION
Installation is in the reverse order of removal.
KBIA2543E
1. Gasket 2. Water pump3. Water pump pulley
KBIA2552E

CO-20Revision: November 2009
WATER PUMP
2006 QX56

After installation bleed the air from the cooling system. Refer to CO-11, "REFILLING ENGINE COOLANT"
.
INSPECTION AFTER INSTALLATION

Check for leaks of engine coolant. Refer to CO-10, "CHECKING COOLING SYSTEM FOR LEAKS" .

Start and warm up engine. Visually check for leaks of the engine coolant.

THERMOSTAT AND WATER PIPINGCO-21
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THERMOSTAT AND WATER PIPINGPFP:21200
Removal and InstallationEBS00REG
REMOVAL
Removal of Thermostat
1. Drain engine coolant from the radiator. Refer to CO-11, "DRAINING ENGINE COOLANT" .
CAUTION:
Perform when engine is cold.
2. Remove the air duct and resonator assembly. Refer to EM-15, "
Removal and Installation" .
3. Remove the engine room cover using power tool.
4. Disconnect the water suction hose from the water inlet.
5. Remove the water inlet and thermostat.
Removal of Thermostat Housing, Water Outlet and Heater Pipe
1. Remove the intake manifold. Refer to EM-17, "Removal and Installation" .
2. Remove the thermostat housing, water outlet and heater pipe.
Removal of Water Cut Valve
1. Drain the engine coolant from the radiator. Refer to CO-11, "DRAINING ENGINE COOLANT" .
KBIA2501E
1. Heater pipe2. Gasket 3. Water outlet
4. Gasket 5.O-ring 6.O-ring
7. Thermostat housing 8. Rubber ring 9. Thermostat
10. Water inlet 11. Water suction hose 12. Water suction pipe
13. Gasket 14. Heater pipe

CO-22Revision: November 2009
THERMOSTAT AND WATER PIPING
2006 QX56
CAUTION:
Perform when the engine is cold.
2. Remove the air duct and resonator assembly. Refer to EM-15, "
Removal and Installation" .
3. Remove the engine room cover using power tool.
4. Disconnect the heater hose (heater core side).
5. Remove the heater hose bracket.
6. Disconnect the water cut valve connector.
7. Remove the water cut valve.
INSPECTION AFTER REMOVAL

Place a thread so that it is caught in the valve of the thermostat.
Immerse fully in a container filled with water. Heat while stirring.

The valve opening temperature is the temperature at which the
valve opens and falls from the thread.

Continue heating. Check the full-open lift amount.

After checking the full-open lift amount, lower the water temper-
ature and check the valve closing temperature.
Standard values:
INSTALLATION
Installation is in the reverse order of removal.
Installation of Thermostat

Install the thermostat with the whole circumference of each
flange part fit securely inside the rubber ring as shown.

Install the thermostat with the jiggle valve facing upwards.
Installation of Water Outlet Pipe and Heater Pipe
First apply a neutral detergent to the O-rings, then quickly insert the insertion parts of the water outlet pipe and
heater pipe into the installation holes.
INSPECTION AFTER INSTALLATION

Check for leaks of the engine coolant. Refer to CO-10, "CHECKING COOLING SYSTEM FOR LEAKS" .

Start and warm up the engine. Visually check for leaks of the engine coolant.
SLC252B
Thermostat
Valve opening temperature 80 - 84°C (176 - 183° F)
Full-open lift amount More than 10 mm/ 95°C (0.39 in/ 203°F)
Valve closing temperature 77°C (171°F) or higher
KBIA2502E

SERVICE DATA AND SPECIFICATIONS (SDS)CO-23
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SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00030
Standard and LimitEBS00REH
ENGINE COOLANT CAPACITY (APPROXIMATE)
Unit: (US gal, Imp gal)
THERMOSTAT
RADIATOR
Unit: kPa (kg/cm2 , psi)
Engine coolant capacity with reservoir tank ("MAX" level)14.4 (3 3/4, 3 1/8)
Valve opening temperature80 - 84°C (176 - 183 °F)
Maximum valve lift More than 10 mm/95°C (0.39 in/203°F)
Valve closing temperature 77°C (171°F) or higher
Reservoir cap relief pressure Standard 95 - 125 (0.97- 1.28, 14 - 18)
Leakage test pressure 137 (1.4, 20)