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Nissan Pathfinder (2008 year). Manual - part 131

OVERHEATING CAUSE ANALYSIS

CO-37

< FUNCTION DIAGNOSIS >

[VK56DE]

Except cool-
ing system
parts mal-
function

—

Overload on engine

Abusive driving

High engine rpm under no
load

Driving in low gear for ex-
tended time

Driving at extremely high
speed

Powertrain system malfunc-
tion

—

Installed improper size
wheels and tires

Dragging brakes

Improper ignition timing

Blocked or restricted air
flow

Blocked bumper

—

Blocked radiator grille

Installed car brassiere

Mud contamination or paper
clogging

Blocked radiator

—

Blocked condenser

Blocked air flow

Installed large fog lamp

Symptom

Check items

CO-38

< ON-VEHICLE MAINTENANCE >

[VK56DE]

ENGINE COOLANT

ON-VEHICLE MAINTENANCE

ENGINE COOLANT

System Inspection

INFOID:0000000001316416

WARNING:

• Never remove the radiator/reservoir cap when the engine is hot. Serious burns could occur from

high pressure fluid escaping from the radiator or reservoir.

• Wrap a thick cloth around the cap. Slowly push down and turn it a quarter turn to allow built-up pres-

sure 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 engine coolant reservoir tank level is within MIN to

MAX level when the engine is cool.

• Adjust engine coolant level as necessary.

CHECKING COOLING SYSTEM FOR LEAKS

WARNING:

Never remove the radiator/reservoir cap when the engine is hot. Serious burns could occur from high-
pressure engine coolant escaping from the radiator or reservoir.
• To check for leakage, apply pressure to the cooling system at the

reservoir filler neck using suitable tool and Tool.

CAUTION:

Higher pressure than specified may cause radiator damage.
NOTE:
In case that engine coolant decreases, replenish cooling system
with engine coolant.

• If any concerns are found, repair or replace damaged parts.

CHECKING RESERVOIR CAP

SMA412B

Tool number

: EG17650301 (J-33984-A)

Leakage test pressure

: 137 kPa (1.4 kg/cm, 20 psi)

WBIA0612E

ENGINE COOLANT

CO-39

< ON-VEHICLE MAINTENANCE >

[VK56DE]

• Check reservoir cap relief pressure using suitable tool and Tool.

NOTE:
Apply engine coolant to the cap seal.

• Replace the reservoir cap if there is any damage in the negative-

pressure valve, or if the open-valve pressure is outside of the limit.

CHECKING RADIATOR CAP

Inspect the radiator cap.
NOTE:
Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.
• Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket.
• Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or the

metal retainer.

CHECKING RADIATOR

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 shroud

and horns. Then tape the harness and electrical connectors to prevent water from entering.

Apply water by hose to the back side of the radiator core, with the hose pointed vertically downward.

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

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

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

, 71 psi) and keep distance more than 30 cm (11.8 in).

Blow air again into all the radiator core surfaces once per minute until no water sprays out.

Check for leaks.

Changing Engine Coolant

INFOID:0000000001297379

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

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.

Remove the engine front undercover using power tool.

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

CAUTION:

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

Tool number

: EG17650301 (J-33984-A)

Standard

: 95 - 125 kPa (0.97 - 1.28 kg/cm

, 14 - 18 psi)

WBIA0611E

LLIA0070E

CO-40

< ON-VEHICLE MAINTENANCE >

[VK56DE]

ENGINE COOLANT

When draining all of the coolant in the system for engine
removal or repair, it is necessary to drain the cylinder block.
Remove the RH cylinder block drain plug to drain the right bank,
the oil cooler hose to drain the left bank as shown and the block
heater if equipped.

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

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-39, "Changing Engine Cool-

ant"

REFILLING ENGINE COOLANT

Close the radiator drain plug. Install the reservoir tank, cylinder block drain plug, the oil cooler hose 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 plug. Use Genuine High Performance Thread

Sealant or equivalent. Refer to

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.

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

PBIC0146E

WBIA0392E

Radiator drain plug

: Refer to

CO-39, "Changing Engine Coolant"

RH cylinder block drain plug

: Refer to

EM-222, "Disassembly and Assembly"

ENGINE COOLANT

CO-41

< ON-VEHICLE MAINTENANCE >

[VK56DE]

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.

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 recommended coolant or equivalent.

Refer to

MA-10, "Fluids and Lubricants"

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.

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.

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

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.

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 non-vented 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 vented reservoir cap.

FLUSHING COOLING SYSTEM

Drain the water from the engine cooling system. Refer to

CO-12, "Changing Engine Coolant"

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

Tool number

: KV991J0070 (J-45695)

Cooling system capacity
(with reservoir)

: Refer to

MA-10, "Fluids

and Lubricants"

Compressed air
supply pressure

: 5.7 - 8.5 kPa (5.6 - 8.4 kg/cm

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

LLIA0057E

CO-42

< ON-VEHICLE MAINTENANCE >

[VK56DE]

ENGINE COOLANT

Run the engine until it reaches normal operating temperature.

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

Stop the engine and wait until it cools down.

Drain the water from the engine cooling system. Refer to

CO-12, "Changing Engine Coolant"

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

RADIATOR

CO-43

< ON-VEHICLE REPAIR >

[VK56DE]

ON-VEHICLE REPAIR

RADIATOR

Removal and Installation

INFOID:0000000001316521

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

Remove air dam using power tool.

Remove engine undercover using power tool.

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.

Reservoir tank

Reservoir tank cap

By-pass hose

By-pass tube

Reservoir tank hose

By-pass hose

Mounting rubber (upper)

Upper mount bracket

Radiator cap

10. Radiator

11.

Mounting rubber (lower)

12. Radiator drain plug

13. O-ring

14. Radiator hose (upper)

15. Radiator hose (lower)

16. Radiator shroud (upper)

17. Radiator shroud (lower)

18. Heater by-pass hose

19. Heater by-pass tube

20. Heater by-pass hose

To thermostat housing

To A/T fluid cooler tube

To transmission auxiliary cooler

To water suction pipe

To heater tube

⇐

Front

ALBIA0406GB

CO-44

< ON-VEHICLE REPAIR >

[VK56DE]

RADIATOR

Remove air duct and resonator assembly. Refer to

EM-165, "Removal and Installation"

Remove reservoir tank hoses.
NOTE:
• Remove reservoir tank hose from radiator.
• Remove reservoir tank return hose from engine.

Removal radiator hoses (upper and lower).

CAUTION:

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

Remove the lower radiator shroud.
• Release the tabs, pull lower radiator shroud rearwards and

down to remove.

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

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

CO-46, "Removal and Installation

(Crankshaft Driven Type)"

10. Remove front grille. Refer to

EXT-16, "Removal and Installation"

11. Remove the upper mount bracket bolts.

12. Remove the two A/C condenser bolts.

WBIA0407E

WBIA0695E

LBIA0419E

LBIA0421E

Content .. 129 130 131 132 ..