Infiniti QX56 (JA60). Manual — part 191
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PREPARATION
CO-5
< PREPARATION >
C
D
E
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G
H
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A
CO
N
P
O
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
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CO-6
< FUNCTION DIAGNOSIS >
COOLING SYSTEM
FUNCTION DIAGNOSIS
COOLING SYSTEM
Cooling Circuit
INFOID:0000000005149038
WBIA0439E
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COOLING SYSTEM
CO-7
< FUNCTION DIAGNOSIS >
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G
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M
A
CO
N
P
O
Schematic
INFOID:0000000005149039
WBIA0463E
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CO-8
< FUNCTION DIAGNOSIS >
OVERHEATING CAUSE ANALYSIS
OVERHEATING CAUSE ANALYSIS
Troubleshooting Chart
INFOID:0000000005149040
Symptom
Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction
Worn or loose drive belt
—
Thermostat stuck closed
Coolant circulation
Damaged fins
Dust contamination or pa-
per clogging
Physical damage
Clogged radiator cooling
tube
Excess foreign material
(rust, dirt, sand, etc.)
Water cut valve malfunction
Excess foreign material
(rust, dirt, sand, etc.), phys-
ical damage
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
—
Coolant viscosity
—
Poor engine coolant quality
—
Engine coolant density
—
Insufficient engine coolant
Engine coolant leaks
Cooling hose
Loose clamp
Cracked hose
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
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