Nissan Pathfinder (2006 year). Instruction — part 132
OVERHEATING CAUSE ANALYSIS
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2006 Pathfinder
OVERHEATING CAUSE ANALYSIS
PFP:00012
Troubleshooting Chart
EBS00QCT
Symptom
Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction
Worn or loose drive belt
—
Thermostat stuck closed
—
Damaged fins
Dust contamination or
paper clogging
Clogged radiator cooling
tube
Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow
Cooling fan does not oper-
ate
Fan assembly
—
High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud
—
—
—
Improper engine coolant
mixture ratio
—
—
—
Poor engine coolant quality
—
Engine coolant viscosity
—
Insufficient engine coolant
Engine coolant leaks
Cooling hose
Loose clamp
Cracked hose
Heater pump
Physical damage
Water pump
Poor sealing
Radiator cap
Loose
Poor sealing
Radiator
O-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank
Cracked reservoir tank
Overflowing reservoir tank
Exhaust gas leaks into
cooling system
Cylinder head deterioration
Cylinder head gasket dete-
rioration
CO-6
OVERHEATING CAUSE ANALYSIS
2006 Pathfinder
Except cool-
ing system
parts mal-
function
—
Overload on engine
Abusive driving
High engine rpm under no
load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system mal-
function
—
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
COOLING SYSTEM
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2006 Pathfinder
COOLING SYSTEM
PFP:21020
Cooling Circuit
EBS00QCU
WBIA0564E
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)
CO-8
COOLING SYSTEM
2006 Pathfinder
System Chart
EBS00QCV
WBIA0565E
ENGINE COOLANT
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2006 Pathfinder
ENGINE COOLANT
PFP:KQ100
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)
WBIA0568E
CO-10
ENGINE COOLANT
2006 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)
WBIA0570E
LLIA0070E
ENGINE COOLANT
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2006 Pathfinder
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
REFILLING ENGINE COOLANT
1.
Close the radiator drain plug. Install the reservoir tank, cylinder
block drain plugs, 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 equiva-
lent. Refer to ! Hyper-link Error ! .
WLIA0020E
WLIA0020E
CO-12
ENGINE COOLANT
2006 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
.
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)
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
LLIA0057E
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