Nissan Frontier. Manual — part 215
COOLING SYSTEM
CO-7
< SYSTEM DESCRIPTION >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
CO
N
P
O
SYSTEM DESCRIPTION
COOLING SYSTEM
Cooling Circuit
INFOID:0000000009478158
PBIC3008E
CO-8
< SYSTEM DESCRIPTION >
[QR25DE]
COOLING SYSTEM
Schematic
INFOID:0000000009478159
AWBIA1004GB
OVERHEATING CAUSE ANALYSIS
CO-9
< SYSTEM DESCRIPTION >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
CO
N
P
O
OVERHEATING CAUSE ANALYSIS
Troubleshooting Chart
INFOID:0000000009478160
Symptom
Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction
Worn or loose drive belt
—
Thermostat or water control
valve stuck closed
Thermostat or water control
valve
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
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-10
< SYSTEM DESCRIPTION >
[QR25DE]
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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