Nissan X-Trail 32. Manual — part 296

CO-10

< SYSTEM DESCRIPTION >

[MR20DD]

DESCRIPTION

M/T models

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OVERHEATING CAUSE ANALYSIS

CO-11

< SYMPTOM DIAGNOSIS >

[MR20DD]

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SYMPTOM DIAGNOSIS

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

—

Thermostat and water con-
trol valve 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 viscosity

—

Insufficient engine coolant

Engine coolant leakage

Cooling hose

Loose clamp

Cracked hose

Water pump

Poor sealing

Reservoir tank 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

CO-12

< SYMPTOM DIAGNOSIS >

[MR20DD]

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

Power train system mal-
function

—

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

ENGINE COOLANT

CO-13

< PERIODIC MAINTENANCE >

[MR20DD]

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PERIODIC MAINTENANCE

ENGINE COOLANT

Inspection

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LEVEL

• Check that the reservoir tank engine coolant level is within the

“MIN” to “MAX” when the engine is cool.

• Adjust the engine coolant level if necessary.

CAUTION:

Refill Genuine NISSAN Long Life Antifreeze/Coolant (blue) or
equivalent in its quality mixed with water (distilled or deminer-
alized). Refer to

MA-23, "Fluids and Lubricants"

.

LEAKAGE

• To check for leakage, apply pressure to the cooling system with the

radiator cap tester (commercial service tool) (A) and the radiator
cap tester adapter (commercial service tool) (B).

WARNING:

Never remove radiator cap when engine is hot. Serious burns
may occur from high-pressure engine coolant escaping from
engine cooling system.

CAUTION:

Higher test pressure than specified may cause radiator dam-
age.
NOTE:
In a case that engine coolant decreases, replenish radiator with engine coolant.

• If anything is found, repair or replace damaged parts.

Draining

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WARNING:

• Never remove radiator cap when engine is hot. Serious burns may occur from high-pressure engine

coolant escaping from radiator.

• Wrap a thick cloth around the radiator cap. Slowly turn it a quarter of a turn to release built-up pres-

sure. Then turn it all the way.

1.

Remove engine under cover. Refer to

EXT-39, "ENGINE UNDER COVER : Exploded View"

.

2.

Open radiator drain plug

at the bottom of radiator, and then

remove radiator cap.

CAUTION:

Perform this step when engine is cold.
• When draining all of engine coolant in the system, open water

drain plugs on cylinder block. Refer to

EM-61, "Setting"

.

3.

Remove reservoir tank if necessary, and drain engine coolant and clean reservoir tank before installing.

: MAX

: MIN

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Testing pressure: Refer to

CO-31, "Radiator"

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PBIC5121J

: Vehicle front

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