Infiniti QX56 (Z62). Manual - part 236

 

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Infiniti QX56 (Z62). Manual - part 236

 

 

CO-4

< SYSTEM DESCRIPTION >

DESCRIPTION

SYSTEM DESCRIPTION

DESCRIPTION

Engine Cooling System

INFOID:0000000006289654

JPBIA4247GB

DESCRIPTION

CO-5

< SYSTEM DESCRIPTION >

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

Engine Cooling System Schematic

INFOID:0000000006289655

JPBIA4248GB

CO-6

< SYMPTOM DIAGNOSIS >

OVERHEATING CAUSE ANALYSIS

SYMPTOM DIAGNOSIS

OVERHEATING CAUSE ANALYSIS

Troubleshooting Chart

INFOID:0000000006289656

Symptom

Check items

Cooling sys-
tem parts 
malfunction

Poor heat transfer

Water pump malfunction

Worn or loose drive belt

Thermostat stuck closed

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

Improper engine coolant 
mixture ratio

Poor engine coolant quality

Engine coolant density

Insufficient engine coolant

Engine coolant leakage

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 leakage into 
cooling system

Cylinder head deterioration

Cylinder head gasket deteri-
oration

OVERHEATING CAUSE ANALYSIS

CO-7

< SYMPTOM DIAGNOSIS >

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

Installed improper size 
wheels and tires

Dragging brakes

Improper ignition timing

Blocked or restricted air 
flow

Blocked bumper

Blocked radiator grille

Installed car brassiere

Mud contamination or paper 
clogging

Blocked radiator

Blocked condenser

Blocked air flow

Installed large fog lamp

Symptom

Check items

 

 

 

 

 

 

 

Content   ..  234  235  236  237   ..