Nissan Frontier. Manual — part 222
COOLING SYSTEM
CO-35
< SYSTEM DESCRIPTION >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
CO
N
P
O
SYSTEM DESCRIPTION
COOLING SYSTEM
Cooling Circuit
INFOID:0000000009478181
AWBIA1904ZZ
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.
Cylinder block (LH)
CO-36
< SYSTEM DESCRIPTION >
[VQ40DE]
COOLING SYSTEM
Schematic
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WBIA0642E
OVERHEATING CAUSE ANALYSIS
CO-37
< SYSTEM DESCRIPTION >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
CO
N
P
O
OVERHEATING CAUSE ANALYSIS
Troubleshooting Chart
INFOID:0000000009478183
Symptom
Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction
Worn or loose drive belt
—
Thermostat stuck closed
Thermostat
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
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
CO-38
< SYSTEM DESCRIPTION >
[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
Mud contamination or paper
clogging
—
Blocked radiator grille
Installed car brassiere
Mud contamination or paper
clogging
Blocked radiator
Blocked air flow
Blocked condenser
Installed large fog lamp
Symptom
Check items
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