Nissan Pathfinder. Manual — part 290
OVERHEATING CAUSE ANALYSIS
CO-7
< SYSTEM DESCRIPTION >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
CO
N
P
O
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
—
Improper size wheels and
tires installed
Brakes dragging
Improper ignition timing
—
Blocked or restricted air
flow
Blocked bumper
—
Blocked condenser
Blocked radiator
Blocked radiator grille
Car brassiere installed
Large fog lamp installed
Mud contamination or paper
clogging
Symptom
Check items
CO-8
< SYSTEM DESCRIPTION >
[VQ35DE]
COOLING SYSTEM
COOLING SYSTEM
Cooling Circuit
INFOID:0000000009177980
AWBIA1193GB
1.
Cylinder block (bank 1)
2.
Oil cooler
3.
Cylinder head (RH)
4.
Water pump
5.
Radiator
6.
Water outlet
7.
Thermostat
8.
Cylinder head (LH)
9.
Cylinder block (bank 2)
A.
To heater
B. To electric throttle control
C. From heater
D.
From electric throttle control
COOLING SYSTEM
CO-9
< SYSTEM DESCRIPTION >
[VQ35DE]
C
D
E
F
G
H
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J
K
L
M
A
CO
N
P
O
Schematic
INFOID:0000000009177981
WBIA0562E
CO-10
< PERIODIC MAINTENANCE >
[VQ35DE]
ENGINE COOLANT
PERIODIC MAINTENANCE
ENGINE COOLANT
System Inspection
INFOID:0000000009177982
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 cap. Slowly turn it a quarter
turn to allow built-up pressure to escape. Carefully remove the cap by 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 the coolant reservoir tank engine coolant level when the
engine is cool.
• Adjust engine coolant level, if necessary, to ensure that the engine
coolant level is within the MIN to MAX range.
CHECKING COOLING SYSTEM FOR LEAKS
To check for leaks, apply pressure to the cooling system using suit-
able tools (A) and (B).
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.
CAUTION:
Higher test pressure than specified may cause radiator dam-
age.
CHECKING RADIATOR CAP
1. Inspect the radiator 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 radiator filler neck to remove any waxy residue or foreign material.
AWBIA1183GB
Testing pressure
: Refer to
.
AWBIA1188GB
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