Nissan Altima HL32 Hybrid. Manual - part 176

COOLING SYSTEM

CO-7

< FUNCTION DIAGNOSIS >

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Schematic

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1. Radiator

2. Water inlet

3. Reservoir tank

4. Thermostat

5. Thermostat housing

6. Water pump

7. Cylinder head

8. Cylinder block

9. Water control valve

10. Water control valve housing

11. Heater

12. Oil cooler

13. Electric throttle control

14

Heater water pump

A.

Open

B.

Closed

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OVERHEATING CAUSE ANALYSIS

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 stuck closed

Coolant circulation

Damaged fins

Dust contamination or rock 
clogging

Mechanical damage

Clogged radiator cooling 
tube

Excess foreign material 
(rust, dirt, sand, etc.)

Reduced air flow

Cooling fan does not oper-
ate

Engine cooling fans

—

High resistance to fan rota-
tion

Damaged fan blades

Damaged radiator shroud

—

Radiator shroud

—

Improper coolant mixture 
ratio

—

Coolant viscosity

—

Poor coolant quality

—

Periodic maintenance

—

Insufficient coolant

Coolant leaks

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 leaks into cool-
ing system

Cylinder head deterioration

Cylinder head gasket deteri-
oration

OVERHEATING CAUSE ANALYSIS

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Except cool-
ing system 
parts mal-
function

—

Overload on engine

Abusive driving

High engine rpm under no 
load

—

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 radiator grille

Installed car brassiere

—

Mud contamination or paper 
clogging

Blocked bumper

Blocked radiator

Blocked condenser

Installed large fog lamp

Symptom

Check items

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< ON-VEHICLE MAINTENANCE >

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ENGINE COOLANT

ON-VEHICLE MAINTENANCE

ENGINE COOLANT

System Inspection

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WARNING:

• Never remove the radiator cap when the engine and inverter are hot. Serious burns could occur from

high pressure fluid escaping from the radiator.

• Wrap a thick cloth around the cap. Slowly push down and turn it a quarter turn to allow built-up pres-

sure to escape. Carefully remove the cap by pushing down and 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 if the reservoir tank coolant level is within MIN to MAX when

the engine and inverter are cool.

• Adjust coolant level if it is too much or too little.

CHECKING COOLING SYSTEM FOR LEAKS

To check for leakage, apply pressure to the cooling system using

suitable tool (A) and Tool (B).

WARNING:

Never remove the radiator cap when the engine and inverter are

hot. Serious burns could occur from high pressure coolant

escaping from the radiator.

CAUTION:

Higher pressure than specified may cause radiator damage.

CHECKING RADIATOR CAP

CAUTION:

Use only specified radiator cap. If radiator cap other than specified is used, engine overheating is

likely to occur.
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.

SMA412B

Tool number

: EG17650301 (J-33984-A)

Testing pressure : 157 kPa (1.6 kg/cm

2

, 23 psi)

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