Nissan Pathfinder (2008 year). Manual - part 132

RADIATOR

CO-45

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13. Remove radiator as follows:

CAUTION:

Do not damage or scratch A/C condenser and radiator core when removing.

a.

With lifting and pulling radiator in a rear direction, disassemble
lower mount from radiator core support center.

CAUTION:

Because A/C condenser is onto the front-lower portion of
radiator, moving to rear direction should be at minimum.

b.

Lift A/C condenser up and remove radiator after disengaging the
fitting at front-bottom surface.

CAUTION:

Lifting A/C condenser should be minimum to prevent a load
to A/C piping.

c.

After removing radiator, put A/C condenser on radiator core sup-
port center to prevent a load to A/C piping, and temporarily fix it
with rope or similar means.

INSTALLATION

Installation is in the reverse order of removal.

INSPECTION AFTER INSTALLATION

• Check for leaks of engine coolant. Refer to 

CO-11, "System Inspection"

.

• Start and warm up engine. Visually check there are no leaks of engine coolant and A/T fluid.

Checking Radiator

INFOID:0000000001297381

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, radia-

tor shroud and horns. Then tape the harness and electrical connectors to prevent water from enter-
ing.

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/cm

2

, 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.

PBIC1936E

PBIC1054E

CO-46

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ENGINE COOLING FAN

ENGINE COOLING FAN

Removal and Installation (Crankshaft Driven Type)

INFOID:0000000001297382

REMOVAL

1.

Remove the air dam using power tool.

2.

Remove the engine front undercover using power tool.

3.

Partially drain engine coolant from radiator. Refer to 

CO-11

.

CAUTION:

• Perform this step when engine is cold.
• Do not spill engine coolant on drive belts.

4.

Remove the air duct and resonator assembly. Refer to 

EM-165, "Removal and Installation"

.

5.

Remove reservoir tank hose from radiator.

6.

Remove reservoir tank hose from engine.

7.

Removal radiator hose (upper) from radiator.

CAUTION:

Do not spill engine coolant on drive belts.

8.

Remove the radiator shroud (lower) and position aside. 
• Release the tabs, pull radiator shroud (lower) rearwards and

down to remove.

9.

Remove the radiator shroud (upper) bolts and remove the radia-
tor shroud (upper) (A).

10. Remove the drive belt. Refer to 

EM-153, "Removal and Installation"

.

11. Remove the engine cooling fan.

1.

Cooling fan

2.

Fan coupling

3.

Fan bracket

4.

Cooling fan pulley

A.

Front mark

⇐

Front

AWBIA0087GB

WBIA0407E

WBIA0695E

ENGINE COOLING FAN

CO-47

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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 fan bracket assem-

bly.

INSTALLATION

Installation is in the reverse order of removal.
• Install cooling fan with its front mark “F” facing front of engine. Refer to 

CO-46, "Removal and Installation

(Crankshaft Driven Type)"

".

INSPECTION AFTER INSTALLATION

• Check for leaks of the engine coolant. Refer to 

CO-38, "System Inspection"

.

• Start and warm up the engine. Visually make sure that there are no leaks of the engine coolant.

Removal and Installation (Motor Driven Type)

INFOID:0000000001297383

REMOVAL

1.

Remove the air dam using power tool.

2.

Remove the engine undercover using power tool.

3.

Loosen the lower fan motor nuts (A).

SLC072

WBIA0418E

ALBIA0405GB

CO-48

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ENGINE COOLING FAN

4.

Disconnect harness connector (A) from fan motor.

5.

Remove the upper fan motor bolts (B) 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-516, "Description"

.

ALBIA0404GB

WATER PUMP

CO-49

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WATER PUMP

Removal and Installation

INFOID:0000000001297384

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.

Remove air dam using power tool.

2.

Remove engine front undercover using power tool.

3.

Drain engine coolant so that no engine coolant comes out from water pump fitting hole. Refer to 

CO-39,

"Changing Engine Coolant"

.

CAUTION:

Perform when the engine is cold.

4.

Remove the air duct and resonator assembly. Refer to 

EM-165, "Removal and Installation"

. 

5.

Remove reservoir tank hose from radiator shroud (upper).

6.

Remove reservoir tank hose from engine.

7.

Remove radiator hose (upper) from radiator.

CAUTION:

Be careful not to allow engine coolant to contact drive belts.

8.

Remove the radiator shroud (lower) and position aside. 
• Release the tabs, pull radiator shroud (lower) rearwards and

down to remove.

KBIA2543E

1.

Gasket

2.

Water pump

3.

Water pump pulley

WBIA0407E

CO-50

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WATER PUMP

9.

Remove the radiator shroud (upper) bolts and remove the radia-
tor shroud (upper) (A).

10. Remove the engine cooling fan (crankshaft driven type). Refer to 

CO-46, "Removal and Installation

(Crankshaft Driven Type)"

.

11. Remove the water pump pulley.

12. 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.
• After installation bleed the air from the cooling system. Refer to 

CO-39, "Changing Engine Coolant"

.

INSPECTION AFTER INSTALLATION

• Check for leaks of engine coolant. Refer to 

CO-38, "System Inspection"

.

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

WBIA0695E

KBIA2552E

THERMOSTAT AND WATER PIPING

CO-51

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THERMOSTAT AND WATER PIPING

Removal and Installation

INFOID:0000000001297385

REMOVAL

Removal of Thermostat

1.

Drain engine coolant from the radiator. Refer to 

CO-39, "Changing Engine Coolant"

.

CAUTION:

Perform when engine is cold.

2.

Remove the air duct and resonator assembly. Refer to 

EM-165, "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-166, "Removal and Installation"

.

2.

Remove the thermostat housing, water outlet and heater pipe.

INSPECTION AFTER REMOVAL

KBIA2501E

1.

Heater pipe

2.

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-52

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THERMOSTAT AND WATER PIPING

• 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 tempera-

ture 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-38, "System Inspection"

.

• 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