Nissan Frontier D40. Manual - part 193

PREPARATION

CO-33

< 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-34

< FUNCTION DIAGNOSIS >

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COOLING SYSTEM

FUNCTION DIAGNOSIS

COOLING SYSTEM

Cooling Circuit

INFOID:0000000005276105

WBIA0641E

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.

Heater pump

10. Cylinder block (LH)

COOLING SYSTEM

CO-35

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Schematic

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WBIA0565E

CO-36

< FUNCTION DIAGNOSIS >

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OVERHEATING CAUSE ANALYSIS

OVERHEATING CAUSE ANALYSIS

Troubleshooting Chart

INFOID:0000000005276107

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

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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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Engine coolant viscosity

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Poor engine coolant quality

—

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Insufficient engine coolant

Engine coolant leaks

 Cooling hose

Loose clamp

Cracked hose

Heater pump

Physical damage

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