Nissan Pathfinder. Manual - part 290

OVERHEATING CAUSE ANALYSIS

CO-7

< SYSTEM DESCRIPTION >

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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

—

Improper size wheels and 
tires installed

Brakes dragging

Improper ignition timing

—

Blocked or restricted air 
flow

Blocked bumper

—

Blocked condenser

Blocked radiator

Blocked radiator grille

Car brassiere installed

Large fog lamp installed

Mud contamination or paper 
clogging

Symptom

Check items

CO-8

< SYSTEM DESCRIPTION >

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COOLING SYSTEM

COOLING SYSTEM

Cooling Circuit

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1.

Cylinder block (bank 1)

2.

Oil cooler

3.

Cylinder head (RH)

4.

Water pump

5.

Radiator

6.

Water outlet

7.

Thermostat

8.

Cylinder head (LH)

9.

Cylinder block (bank 2)

A.

To heater

B. To electric throttle control

C. From heater

D.

From electric throttle control

COOLING SYSTEM

CO-9

< SYSTEM DESCRIPTION >

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Schematic

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CO-10

< PERIODIC MAINTENANCE >

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ENGINE COOLANT

PERIODIC MAINTENANCE

ENGINE COOLANT

System Inspection

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WARNING:

Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure

engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter

turn to allow built-up pressure to escape. Carefully remove the cap by turning it all the way.    

CHECKING COOLING SYSTEM HOSES

Check hoses for the following:

• Improper attachment

• Leaks

• Cracks

• Damage

• Loose connections

• Chafing

• Deterioration

CHECKING RESERVOIR LEVEL

• Check the coolant reservoir tank engine coolant level when the

engine is cool.   

• Adjust engine coolant level, if necessary, to ensure that the engine

coolant level is within the MIN to MAX range.

CHECKING COOLING SYSTEM FOR LEAKS

To check for leaks, apply pressure to the cooling system using suit-

able tools (A) and (B). 

WARNING:

Do not remove the radiator cap when the engine is hot. Serious

burns could occur from high pressure engine coolant escaping

from the radiator.

CAUTION:

Higher test pressure than specified may cause radiator dam-

age.

CHECKING RADIATOR CAP

1. Inspect the radiator cap.

• Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket.

• Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or

the metal retainer.

NOTE:

Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.

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Testing pressure

: Refer to 

CO-28, "Radiator"

.

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