Nissan Pathfinder (2011 year). Manual - part 135

RADIATOR

CO-51

< REMOVAL AND INSTALLATION >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

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.

2011 Pathfinder

CO-52

< REMOVAL AND INSTALLATION >

[VK56DE]

ENGINE COOLING FAN

ENGINE COOLING FAN

Exploded View

INFOID:0000000006247878

Crankshaft Driven Type

Removal and Installation (Crankshaft Driven Type)

INFOID:0000000006247879

REMOVAL

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure

engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter

of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.
1. Remove the engine front under cover. Refer to 

EXT-15, "Removal and Installation"

.

2. 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.

3. Remove the air duct and resonator assembly. Refer to 

EM-165, "Removal and Installation"

.

4. Remove reservoir tank hose from radiator.
5. Remove reservoir tank hose from engine.
6. Remove upper radiator hose.

CAUTION:

Do not spill engine coolant on drive belts.

7. Remove lower radiator hose.
8. Remove A/T fluid cooler hose from radiator.

CAUTION:

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

9. Remove the radiator lower shroud and position aside. 

• Release the tabs, pull radiator lower shroud rearward and

down to remove.

AWBIA0987ZZ

1.

Cooling fan

2.

Fan coupling

3.

Fan bracket

4.

Cooling fan pulley

A.

Front mark

⇐

Front

WBIA0407E

2011 Pathfinder

ENGINE COOLING FAN

CO-53

< REMOVAL AND INSTALLATION >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

10. Remove the radiator upper shroud bolts and remove the radiator

upper shroud (A).

11. Remove the drive belt. Refer to 

EM-153, "Removal and Installation"

.

12. Remove the engine cooling fan.
13. Remove fan coupling, if necessary.
14. Remove cooling fan pulley, if necessary.
15. Remove fan bracket, if necessary.

INSPECTION AFTER REMOVAL

Fan Coupling

• Inspect fan coupling for oil leakage and bimetal conditions. 

• If there are any unusual concerns, replace the fan coupling.

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-52, "Removal and Installation

(Crankshaft Driven Type)"

.

INSPECTION AFTER INSTALLATION

• Check for coolant leaks. Refer to 

CO-42, "System Inspection"

.

• Start and warm up the engine. Visually check for coolant leaks. Repair as necessary.

Removal and Installation (Motor Driven Type)

INFOID:0000000006247880

REMOVAL

1. Remove the front grille. Refer to 

EXT-20, "Removal and Installation"

.

WBIA0695E

SLC072

WBIA0418E

2011 Pathfinder

CO-54

< REMOVAL AND INSTALLATION >

[VK56DE]

ENGINE COOLING FAN

2. Loosen the lower fan motor nuts (A).

3. Disconnect harness connector (A) from fan motor.
4. 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-511, "Description"

.

ALBIA0405GB

ALBIA0404GB

2011 Pathfinder

WATER PUMP

CO-55

< REMOVAL AND INSTALLATION >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

WATER PUMP

Exploded View

INFOID:0000000006247881

Removal and Installation

INFOID:0000000006247882

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure

engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter

of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

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.

• After installing water pump, connect hoses and clamps securely, then check for leaks.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.

REMOVAL

1. Remove engine front under cover. Refer to 

EXT-15, "Removal and Installation"

.

2. Drain engine coolant from the radiator. Refer to 

CO-44, "Changing Engine Coolant"

.

CAUTION:

• Perform when the engine is cold.

• Do not spill engine coolant on drive belt.

3. Remove the engine room cover. Refer to 

EM-164, "Removal and Installation"

.

4. Remove drive belt. Refer to 

EM-153, "Removal and Installation"

.

5. Remove reservoir tank hose from radiator shroud (upper).
6. Remove reservoir tank hose from engine.
7. Remove upper radiator hose.

CAUTION:

Do not spill engine coolant on drive belt.

8. Remove A/T fluid cooler hose from radiator.
9. Remove the engine cooling fan (crankshaft driven type). Refer to 

CO-52, "Removal and Installation

(Crankshaft Driven Type)"

.

10. Remove the water pump pulley.
11. Remove the water pump.

• Engine coolant will leak from the cylinder block, so have a receptacle ready below.

CAUTION:

KBIA2543E

1. Gasket

2. Water pump

3. Water pump pulley

2011 Pathfinder

CO-56

< REMOVAL AND INSTALLATION >

[VK56DE]

WATER PUMP

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.

• Check that the vane shaft is not loose and 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-44, "Changing Engine Coolant"

.

INSPECTION AFTER INSTALLATION

• Check for coolant leaks. Refer to 

CO-42, "System Inspection"

.

• Start and warm up engine. Visually check for coolant leaks. Repair as necessary.

KBIA2552E

2011 Pathfinder

THERMOSTAT AND WATER PIPING

CO-57

< REMOVAL AND INSTALLATION >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

THERMOSTAT AND WATER PIPING

Exploded View

INFOID:0000000006247883

Removal and Installation

INFOID:0000000006247884

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure

engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter

of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.

REMOVAL

Removal of Thermostat

1. Remove engine under cover. Refer to 

EXT-15, "Removal and Installation"

.

2. Partially drain engine coolant from the radiator. Refer to 

CO-44, "Changing Engine Coolant"

.

CAUTION:

• Perform when engine is cold.

• Do not spill engine coolant on drive belts.

3. Remove the engine room cover. Refer to 

EM-164, "Removal and Installation"

.

4. Remove the air duct and resonator assembly. Refer to 

EM-165, "Removal and Installation"

.

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

2011 Pathfinder

CO-58

< REMOVAL AND INSTALLATION >

[VK56DE]

THERMOSTAT AND WATER PIPING

5. Disconnect the water suction hose from the water inlet.
6. 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. Refer to 

CO-57

3. Remove upper radiator hose.
4. Remove the thermostat housing, water outlet and heater pipe.

INSPECTION AFTER REMOVAL

1. Check valve seating condition at room temperature. It should seat tightly.
2. Check valve operation.

• Place a thread so that it is caught in the valve of the thermo-

stat. 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 tem-

perature and check the valve closing temperature.

• If valve seating at measured values are out of standard range, replace the thermostat. 

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Do not spill engine coolant in engine room. Use a rag to absorb engine coolant.

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

Apply mild soap to the O-ring before inserting water pipe or heater pipes. 

CAUTION:

Do not reuse O-ring.

INSPECTION AFTER INSTALLATION

• Check for coolant leaks. Refer to 

CO-42, "System Inspection"

.

• Start and warm up the engine. Visually check for coolant leaks. Repair as necessary.

SLC252B

Thermostat

                        Standard

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

2011 Pathfinder