Infiniti QX56 (JA60). Manual - part 191

PREPARATION

CO-5

< PREPARATION >

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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

CO-6

< FUNCTION DIAGNOSIS >

COOLING SYSTEM

FUNCTION DIAGNOSIS

COOLING SYSTEM

Cooling Circuit

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WBIA0439E

COOLING SYSTEM

CO-7

< FUNCTION DIAGNOSIS >

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Schematic

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WBIA0463E

CO-8

< FUNCTION DIAGNOSIS >

OVERHEATING CAUSE ANALYSIS

OVERHEATING CAUSE ANALYSIS

Troubleshooting Chart

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Symptom

Check items

Cooling sys-
tem parts 
malfunction

Poor heat transfer

Water pump malfunction

Worn or loose drive belt

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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

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High resistance to fan rota-
tion

Damaged fan blades

Damaged radiator shroud

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Radiator shroud

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Improper engine coolant 
mixture ratio

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Coolant viscosity

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Poor engine coolant quality

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Engine coolant density

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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