Nissan Pathfinder (2012 year). Instruction — part 126
PREPARATION
CO-5
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PREPARATION
PREPARATION
Special Service Tool
INFOID:0000000007357902
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
Description
KV10111100
(J-37228)
Seal cutter
Removing chain tensioner cover and water
pump cover
WS39930000
( — )
Tube presser
Pressing the tube of liquid gasket
EG17650301
(J-33984-A)
Radiator cap tester adapter
Adapting radiator cap tester to radiator cap
and radiator filler neck
a: 28 (1.10) diameter
b: 31.4 (1.236) diameter
c: 41.3 (1.626) diameter
Unit: mm (in)
KV991J0070
(J-45695)
Coolant refill tool
Filling cooling system
KV991J0010
(J-23688)
Engine coolant refractometer
Checking concentration of ethylene glycol in
engine coolant
—
(J-24460-92)
Radiator Pressure Test Adapter
Pressure testing of the pressurized cooling
system overflow tank
NT046
S-NT052
S-NT564
LMA053
WBIA0539E
AWBIA0891ZZ
August 2012
2012 Pathfinder
CO-6
< PREPARATION >
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PREPARATION
Commercial Service Tool
INFOID:0000000007357903
Tool name
Description
Power tool
Loosening nuts, screws and bolts
Radiator cap tester
Checking radiator and radiator cap
PIIB1407E
PBIC1982E
August 2012
2012 Pathfinder
COOLING SYSTEM
CO-7
< SYSTEM DESCRIPTION >
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SYSTEM DESCRIPTION
COOLING SYSTEM
Cooling Circuit
INFOID:0000000007357904
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)
August 2012
2012 Pathfinder
CO-8
< SYSTEM DESCRIPTION >
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COOLING SYSTEM
Schematic
INFOID:0000000007357905
WBIA0565E
August 2012
2012 Pathfinder
OVERHEATING CAUSE ANALYSIS
CO-9
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OVERHEATING CAUSE ANALYSIS
Troubleshooting Chart
INFOID:0000000007357906
Symptom
Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction
Worn or loose drive belt
—
Coolant circulation
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
—
Radiator shroud
—
Improper engine coolant
mixture ratio
—
Engine coolant viscosity
—
Poor engine coolant quality
—
—
Insufficient engine coolant
Engine coolant leaks
Cooling hose
Loose clamp
Cracked hose
Heater pump
Physical damage
Water pump
Poor sealing
Radiator or reservoir cap
Loose
Poor sealing
O-ring for damage, deterio-
ration or improper fitting
Radiator
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
August 2012
2012 Pathfinder
CO-10
< SYSTEM DESCRIPTION >
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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
Installed car brassiere
—
Blocked radiator grille
Mud contamination or paper
clogging
Blocked radiator
Blocked condenser
Blocked air flow
Installed large fog lamp
Symptom
Check items
August 2012
2012 Pathfinder
ENGINE COOLANT
CO-11
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PERIODIC MAINTENANCE
ENGINE COOLANT
System Inspection
INFOID:0000000007357907
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 (A) and Tool (B).
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
1. Inspect the reservoir cap.
• 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.
NOTE:
Thoroughly wipe out the reservoir filler neck to remove any waxy residue or foreign material.
SMA412B
Tool number
: — (J-24460-92)
Testing pressure
: 137 kPa (1.4 kg/cm
2
, 20 psi)
AWBIA1467ZZ
August 2012
2012 Pathfinder
CO-12
< PERIODIC MAINTENANCE >
[VQ40DE]
ENGINE COOLANT
2. Pull the negative-pressure valve to open it and check that it
closes completely when released.
• Check that there is no dirt or damage on the valve seat of the
reservoir cap negative-pressure valve.
• Check that there are no abnormalities in the opening and clos-
ing conditions of the negative-pressure valve.
3. Check reservoir cap relief pressure using suitable tool and Tool.
NOTE:
• Apply engine coolant to the cap seal surface.
• Replace the reservoir cap if there is any damage in the nega-
tive-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 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, radia-
tor shroud and horns. Then tape the harness and electrical connectors to prevent water from enter-
ing.
1. Spray water to the back side of the radiator core using a side to side motion from the top down.
2. Stop spraying when debris no longer flows from radiator core.
3. Blow air into the back side of radiator core using a side to side motion from the top down.
• Use compressed air lower than 490 kPa (5 kg/cm
2
, 71 psi) and keep distance more than 30 cm (11.8 in).
4. Continue to blow air until no water sprays out.
5. Check for coolant leaks. Repair as necessary.
Changing Engine Coolant
INFOID:0000000007357908
WARNING:
Do not 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 radiator cap. Slowly turn it a
quarter of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.
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 under cover using power tool.
SMA967B
Tool number
: — (J-33984-A)
Standard: 98 – 118 kPa (1.0 – 1.2 kg/cm
2
, 14 – 17 psi)
WBIA0570E
August 2012
2012 Pathfinder
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