Nissan Pathfinder (2010 year). Instruction — part 126
CO-6
< PREPARATION >
[VQ40DE]
PREPARATION
Tool name
Description
Power tool
Loosening bolts and nuts
Radiator cap tester
Checking radiator and radiator cap
Coolant system tester adapter
Adapting radiator cap tester to reservoir filler
neck
Coolant system tester adapter
Adapting radiator cap tester to reservoir cap
PBIC0190E
PBIC1982E
WBIA0408E
WBIA0409E
2010 Pathfinder
COOLING SYSTEM
CO-7
< FUNCTION DIAGNOSIS >
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FUNCTION DIAGNOSIS
COOLING SYSTEM
Cooling Circuit
INFOID:0000000005260553
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)
2010 Pathfinder
CO-8
< FUNCTION DIAGNOSIS >
[VQ40DE]
COOLING SYSTEM
Schematic
INFOID:0000000005260554
WBIA0565E
2010 Pathfinder
OVERHEATING CAUSE ANALYSIS
CO-9
< FUNCTION DIAGNOSIS >
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OVERHEATING CAUSE ANALYSIS
Troubleshooting Chart
INFOID:0000000005260555
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 pa-
per clogging
Physical damage
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 cool-
ing system
Cylinder head deterioration
Cylinder head gasket deteri-
oration
2010 Pathfinder
CO-10
< FUNCTION DIAGNOSIS >
[VQ40DE]
OVERHEATING CAUSE ANALYSIS
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
2010 Pathfinder
ENGINE COOLANT
CO-11
< ON-VEHICLE MAINTENANCE >
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ON-VEHICLE MAINTENANCE
ENGINE COOLANT
System Inspection
INFOID:0000000005260556
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 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 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)
Testing pressure : 137 kPa (1.4 kg/cm
2
, 20 psi)
WBIA0568E
2010 Pathfinder
CO-12
< ON-VEHICLE MAINTENANCE >
[VQ40DE]
ENGINE COOLANT
• 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.
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
INFOID:0000000005260557
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 allow the coolant to contact the drive belts.
Tool number
: EG17650301 (J-33984-A)
Standard: 98 – 118 kPa (1.0 – 1.2 kg/cm
2
, 14 – 17 psi)
WBIA0570E
LLIA0070E
2010 Pathfinder
ENGINE COOLANT
CO-13
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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 (A), (B), (C), (D) 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 (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
.
Block Plug and Block Heater Installation
WLIA0020E
WLIA0020E
Part
Washer
Tightening Torque
A
No
EM-102, "Disassembly and Assembly"
.
B
Reuse
No
EM-102, "Disassembly and Assembly"
.
New
EM-102, "Disassembly and Assembly"
.
2010 Pathfinder
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