Nissan Pathfinder (2007 year). Manual - part 132

COOLING SYSTEM

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COOLING SYSTEM

PFP:21020

Cooling Circuit

EBS00QCU

WBIA0641E

1.

Cylinder block (RH)

2.

Oil cooler

3.

Cylinder head (RH)

4.

Water pump

5.

Radiator

6.

Water inlet

7.

Thermostat

8.

Cylinder head (LH)

9.

Heater pump

10. Cylinder block (LH)

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COOLING SYSTEM

2007 Pathfinder

System Chart

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ENGINE COOLANT

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ENGINE COOLANT

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System Check

EBS00QCW

WARNING:

●

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

●

Wrap a thick cloth around the cap. Slowly push down and turn it a quarter turn to allow built-up
pressure to escape. Carefully remove the cap by pushing down and turning it all the way.

CHECKING COOLING SYSTEM HOSES

Check hoses for the following:

●

Improper attachment

●

Leaks

●

Cracks

●

Damage

●

Loose connections

●

Chafing

●

Deterioration

CHECKING RESERVOIR LEVEL

●

Check if the reservoir tank coolant level is within MIN to MAX
when the engine is cool.

●

Adjust coolant level if it is too much or too little.

CHECKING COOLING SYSTEM FOR LEAKS

To check for leakage, apply pressure to the cooling system using
Tool.

WARNING:

Never remove the radiator/reservoir cap when the engine is hot.
Serious burns could occur from high pressure coolant escap-
ing from the radiator.

CAUTION:

Higher pressure than specified may cause radiator damage.

SMA412B

Tool number

: EG17650301 (J-33984-A)

Testing pressure

: 137 kPa (1.4 kg/cm

2

 , 20 psi)

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ENGINE COOLANT

2007 Pathfinder

CHECKING RESERVOIR CAP

1.

Check reservoir cap relief pressure using Tool.

●

When connecting the reservoir cap to the tester, apply water
or coolant to the cap seal surface. 

●

Replace the reservoir cap if there is an abnormality in the
negative-pressure valve, or if the open-valve pressure is out-
side of the standard values.

CHECKING RADIATOR

Check radiator for mud or clogging. If necessary, clean radiator as follows.

●

Be careful not to bend or damage the radiator fins.

●

When radiator is cleaned without removal, remove all surrounding parts such as cooling fan 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, with the hose pointed vertically downward.

2.

Apply water again to all radiator core surfaces once per minute.

3.

Stop washing if any stains no longer flow out from the radiator.

4.

Blow air into the back side of radiator core, with the air hose pointed 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 once per minute until no water sprays out.

6.

Check for leaks.

Changing Engine Coolant

EBS00T34

WARNING:

●

To avoid being scalded, never change the coolant when the engine is hot.

●

Wrap a thick cloth around the cap to carefully remove the cap. First, turn the cap a quarter of a
turn to release any built-up pressure, then push down and turn the cap all the way to remove it.

DRAINING ENGINE COOLANT

1.

Turn ignition switch ON and set temperature control lever all the way to HOT position or the highest tem-
perature position. Wait 10 seconds and turn ignition switch OFF.

2.

Remove the engine front undercover using power tool.

3.

Open the radiator drain plug at the bottom of the radiator, and
remove the reservoir cap. This is the only step required when
partially draining the cooling system (radiator only). 

CAUTION:

Do not to allow the coolant to contaminate the drive belts. 

Tool number

: EG17650301 (J-33984-A)

Standard: 78 – 98 kPa (0.8 – 1.0 kg/cm

2

 , 11 – 14 psi)

Limit: 59 kPa (0.6 kg/cm

2

 , 9 psi)

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ENGINE COOLANT

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4.

When draining all of the coolant in the system for engine
removal or repair, it is necessary to drain the cylinder block.
Remove the cylinder block drain plugs, and block heater if
equipped, to drain the cylinder block as shown.

NOTE:
For Canada, the “D” cylinder block drain plug as shown, is not a
cylinder block drain plug but a block heater.

5.

Remove the reservoir tank to drain the engine coolant, then clean the reservoir tank before installing it.

6.

Check the drained coolant for contaminants such as rust, corrosion or discoloration.
If the coolant is contaminated, flush the engine cooling system. Refer to 

CO-10, "DRAINING ENGINE

COOLANT"

 .

REFILLING ENGINE COOLANT

1.

Close the radiator drain plug. Install the reservoir tank, cylinder
block drain plugs A, B, C, D and block heater if equipped, if
removed for a total system drain or for engine removal or repair.

●

The radiator must be completely empty of coolant and water.

●

Apply sealant to the threads of the cylinder block drain plugs
A, B, C, D. Use Genuine High Performance Thread Sealant or
equivalent. Refer to 

GI-47, "Recommended Chemical Prod-

ucts and Sealants"

 .

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ENGINE COOLANT

2007 Pathfinder

Block Plug and Block Heater Installation

2.

Set the vehicle heater controls to the full HOT and heater ON position. Turn the vehicle ignition ON with
the engine OFF as necessary to activate the heater mode.

3.

Remove the vented reservoir cap and replace it with a non-vented reservoir cap before filling the cooling
system.

4.

Install the Tool by installing the radiator cap adapter onto the
radiator neck opening. Then attach the gauge body assembly
with the refill tube and the venturi assembly to the radiator cap
adapter.

5.

Insert the refill hose into the coolant mixture container that is
placed at floor level. Make sure the ball valve is in the closed
position. 

●

Use Genuine NISSAN Long Life Anti-freeze coolant or equiv-
alent, mixed 50/50 with distilled water or demineralized water.
Refer to 

MA-12, "ANTI-FREEZE COOLANT MIXTURE

RATIO"

 .

6.

Install an air hose to the venturi assembly, the air pressure must
be within specification. 

CAUTION:

The compressed air supply must be equipped with an air
dryer.

7.

The vacuum gauge will begin to rise and there will be an audible hissing noise. During this process open
the ball valve on the refill hose slightly. Coolant will be visible rising in the refill hose. Once the refill hose is
full of coolant, close the ball valve. This will purge any air trapped in the refill hose.

8.

Continue to draw the vacuum until the gauge reaches 28 inches
of vacuum. The gauge may not reach 28 inches in high altitude
locations, refer to the vacuum specifications based on the alti-
tude above sea level.

9.

When the vacuum gauge has reached the specified amount, disconnect the air hose and wait 20 seconds
to see if the system loses any vacuum. If the vacuum level drops, perform any necessary repairs to the
system and repeat steps 6 - 8 to bring the vacuum to the specified amount. Recheck for any leaks. 

Part

Washer

Tightening Torque

A

No

19.6 N·m (2.0 kg-m, 14 ft-lb)

B

Reuse

No

9.8 N·m (1.0 kg-m, 87 in-lb)

New

6.0 N·m (0.61 kg-m, 53 in-lb)

C

Yes

62 N·m (6.3 kg-m, 46 ft-lb)

D

Plug

Yes

62 N·m (6.3 kg-m, 46 ft-lb)

Block heater

73.5 N·m (7.5 kg-m, 54 ft-lb)

Tool number

: KV991J0070 (J-45695)

Cooling system capacity 
(with reservoir)

: Refer to 

MA-11, "Fluids 

and Lubricants"

 .

Compressed air 
supply pressure

: 5.7 - 8.5 kPa (5.6 - 8.4 kg/cm

2

 , 

80 - 120 psi)

LLIA0058E

Altitude above sea level

Vacuum gauge reading

0 - 100 m (328 ft)

: 28 inches of vacuum

300 m (984 ft)

: 27 inches of vacuum

500 m (1,641 ft)

: 26 inches of vacuum

1,000 m (3,281 ft)

: 24 - 25 inches of vacuum

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ENGINE COOLANT

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10. Place the coolant container (with the refill hose inserted) at the same level as the top of the radiator. Then

open the ball valve on the refill hose so the coolant will be drawn up to fill the cooling system. The cooling
system is full when the vacuum gauge reads zero.

CAUTION:

Do not allow the coolant container to get too low when filling, to avoid air from being drawn into
the cooling system. 

11. Remove the Tool from the radiator neck opening and install the radiator cap.

12. Remove the reservoir cap.

13. Fill the cooling system reservoir tank to the specified level. Run the engine to warm up the cooling system

and top up the system as necessary before installing the reservoir cap.

FLUSHING COOLING SYSTEM

1.

Drain the water from the engine cooling system. Refer to 

CO-10, "DRAINING ENGINE COOLANT"

 .

2.

Fill the radiator and the reservoir tank (to the “MAX” line), with water. Reinstall the radiator cap and leave
the vented reservoir cap off.

3.

Run the engine until it reaches normal operating temperature.

4.

Press the engine accelerator two or three times under no-load.

5.

Stop the engine and wait until it cools down.

6.

Drain the water from the engine cooling system. Refer to 

CO-10, "DRAINING ENGINE COOLANT"

 .

7.

Repeat steps 2 through 6 until clear water begins to drain from the radiator.

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RADIATOR

2007 Pathfinder

RADIATOR

PFP:21400

Removal and Installation

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WARNING:

Do not remove radiator cap when engine is hot. Serious burns could occur from high-pressure engine
coolant escaping from 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.

REMOVAL

1.

Remove engine cover with power tool. Refer to 

EM-13, "Removal and Installation"

 .

2.

Drain engine coolant from radiator. Refer to 

CO-9, "ENGINE COOLANT"

 .

CAUTION:

●

Perform this step when engine is cold.

●

Do not spill engine coolant on drive belts.

3.

Remove air duct and air cleaner case assembly. Refer to 

EM-16, "Removal and Installation"

 .

4.

Remove reservoir tank hose.

5.

Removal radiator hoses (upper and lower) and reservoir tank hose.

CAUTION:

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

6.

Remove radiator cooling fan assembly. Refer to 

CO-17, "ENGINE COOLING FAN"

 .

1.

Reservoir tank

2.

Reservoir tank cap

3.

Reservoir tank hose

4.

Radiator hose (upper)

5.

Upper mount bracket

6.

Mounting rubber (upper)

7.

Radiator cap

8.

Radiator

9.

Mounting rubber (lower)

10. Radiator drain plug

11.

O-ring

12. A/T fluid cooler hose

13. Radiator hose (lower)

14. Heater bypass tube

15. Heater bypass hose

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