Infiniti QX56 (JA60). Manual - part 192

 

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Infiniti QX56 (JA60). Manual - part 192

 

 

OVERHEATING CAUSE ANALYSIS

CO-9

< FUNCTION DIAGNOSIS >

C

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CO

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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

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

Blocked air flow

Installed large fog lamp

Symptom

Check items

CO-10

< ON-VEHICLE MAINTENANCE >

ENGINE COOLANT

ON-VEHICLE MAINTENANCE

ENGINE COOLANT

Inspection

INFOID:0000000005149041

LEVEL CHECK

• Check if the engine coolant reservoir tank level is within MIN to

MAX level when engine is cool.

• Adjust engine coolant level as necessary.

CHECKING COOLING SYSTEM FOR LEAKS

WARNING:

Never remove the radiator or reservoir cap when the engine is hot. Serious burns could occur from

high-pressure engine coolant escaping from the radiator or reservoir.

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

reservoir filler neck using suitable tool and Tool.

CAUTION:

Higher pressure than specified may cause radiator damage.

NOTE:

In case that engine coolant decreases, replenish cooling system

with engine coolant.

• If any concerns are found, repair or replace damaged parts.

CHECKING RESERVOIR CAP

• Check reservoir cap relief pressure using suitable tool and Tool.

NOTE:

Apply engine coolant to the cap seal.

• Replace the reservoir cap if there is any damage in the negative-

pressure valve, or if the open-valve pressure is outside of the limit.

CHECKING RADIATOR CAP

SMA412B

Tool number

: EG17650301 (J-33984-A)

Leakage test pressure

: 137 kPa (1.4 kg/cm, 20 psi)

WBIA0612E

Tool number

: EG17650301 (J-33984-A)

Standard : 95 - 125 kPa (0.97 - 1.28 kg/cm

2

, 14 - 18 psi)

WBIA0611E

ENGINE COOLANT

CO-11

< ON-VEHICLE MAINTENANCE >

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Inspect the radiator cap.

NOTE:

Thoroughly wipe out the radiator filler neck to remove any waxy resi-

due or foreign material.

• 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 mate-

rial are on the black rubber gasket or the metal retainer.

• Pull negative-pressure valve to open it and make sure that it closes

completely when released.

• Make sure that there is no dirt or damage on the valve seat of radi-

ator cap negative-pressure valve.

• Make sure that there are no unusualness in the opening and clos-

ing conditions of negative-pressure valve.

Changing Engine Coolant

INFOID:0000000005149042

WARNING:

• To avoid being scalded, never change the coolant when the engine is hot.

• Wrap a thick cloth around the cap to carefully remove the cap. First, turn the cap a quarter of a turn

to release any built-up pressure, then push down and turn the cap all the way to remove it.

DRAINING ENGINE COOLANT

1. Turn ignition switch ON and set temperature control lever all the way to HOT position or the highest tem-

perature position. Wait 10 seconds and turn ignition switch OFF.

2. Remove the engine front undercover using power tool.
3. Open the radiator drain plug at the bottom of the radiator, and

remove the radiator filler cap. This is the only step required

when partially draining the cooling system (radiator only). 

CAUTION:

Do not to allow the coolant to contact the drive belts. 

4. When draining all of the coolant in the system for engine

removal or repair, it is necessary to drain the cylinder block.

Remove the RH cylinder block drain plug to drain the right bank

and the oil cooler hose to drain the left bank as shown.

PBIC2816E

SMA967B

WBIA0391E

PBIC0146E

CO-12

< ON-VEHICLE MAINTENANCE >

ENGINE COOLANT

5. Remove the reservoir tank to drain the engine coolant, then clean the reservoir tank before installing it.
6. Check the drained coolant for contaminants such as rust, corrosion or discoloration.

If the coolant is contaminated, flush the engine cooling system. Refer to 

CO-11, "Changing Engine Cool-

ant"

.

REFILLING ENGINE COOLANT

1. Close the radiator drain plug. Install the reservoir tank, cylinder block drain plug, and the oil cooler hose, if

removed for a total system drain or for engine removal or repair.

• The radiator must be completely empty of coolant and water.

• Apply sealant to the threads of the cylinder block drain plug. Use Genuine High Performance Thread

Sealant or equivalent. Refer to 

GI-15, "Recommended Chemical Products and Sealants"

.

2. Set the vehicle heater controls to the full HOT and heater ON position. Turn the vehicle ignition ON with

the engine OFF as necessary to activate the heater mode.

3. Remove the vented reservoir cap and replace it with a non-vented reservoir cap before filling the cooling

system.

4. Install the Tool by installing the radiator cap adapter onto the

radiator neck opening. Then attach the gauge body assembly

with the refill tube and the venturi assembly to the radiator cap

adapter.

5. Insert the refill hose into the coolant mixture container that is

placed at floor level. Make sure the ball valve is in the closed

position. 

• Use Genuine NISSAN Long Life Anti-freeze coolant or equiva-

lent, mixed 50/50 with distilled water or demineralized water.

Refer to 

MA-13, "Fluids and Lubricants"

6. Install an air hose to the venturi assembly, the air pressure must

be within specification. 

CAUTION:

The compressed air supply must be equipped with an air

dryer.

7. The vacuum gauge will begin to rise and there will be an audible hissing noise. During this process open

the ball valve on the refill hose slightly. Coolant will be visible rising in the refill hose. Once the refill hose is

full of coolant, close the ball valve. This will purge any air trapped in the refill hose.

WBIA0392E

Radiator drain plug

: Refer to 

CO-11

.

RH cylinder block drain plug

: Refer to 

EM-83

.

Tool number

: KV991J0070 (J-45695)

Cooling system capacity 
(with reservoir)

: Refer to 

MA-13, "Fluids 

and Lubricants"

.

Compressed air 
supply pressure

: 5.7 - 8.5 kPa (5.6 - 8.4 kg/cm

2

, 80 

- 120 psi)

LLIA0058E

 

 

 

 

 

 

 

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