Nissan Frontier. Manual - part 222

 

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Nissan Frontier. Manual - part 222

 

 

COOLING SYSTEM

CO-35

< SYSTEM DESCRIPTION >

[VQ40DE]

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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

INFOID:0000000009478182

WBIA0642E

OVERHEATING CAUSE ANALYSIS

CO-37

< SYSTEM DESCRIPTION >

[VQ40DE]

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D

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F

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H

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J

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L

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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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