Infiniti M35/M45 Y50. Manual - part 342

COOLING SYSTEM

CO-9

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COOLING SYSTEM

PFP:21020

Cooling Circuit

NBS004QO

PBIC2073E

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COOLING SYSTEM

System Chart

NBS004QP

PBIC0847E

ENGINE COOLANT

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ENGINE COOLANT

PFP:KQ100

Inspection

NBS004QQ

LEVEL CHECK

●

Check if the reservoir tank engine coolant level is within the
“MIN” to “MAX” when the engine is cool.

●

Adjust the engine coolant level as necessary.

LEAK CHECK

●

To check for leaks, apply pressure to the cooling system with the
radiator cap tester (commercial service tool) (A) and radiator
cap tester adapter (commercial service tool) (B).

WARNING:

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

CAUTION:

Higher test pressure than specified may cause radiator
damage.

NOTE:
In a case that engine coolant decreases, replenish radiator with engine coolant.

●

If anything is found, repair or replace damaged parts.

Changing Engine Coolant

NBS004QR

WARNING:

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To avoid being scalded, do not change engine coolant when the engine is hot.

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Wrap a thick cloth around radiator cap and carefully remove radiator cap. First, turn radiator cap a
quarter of a turn to release built-up pressure. Then turn radiator cap all the way.

DRAINING ENGINE COOLANT

1.

Remove engine room cover (RH and LH). Refer to 

EM-15, "ENGINE ROOM COVER"

 . 

2.

Remove air duct (inlet). Refer to 

EM-19, "AIR CLEANER AND AIR DUCT"

 .

3.

Open radiator drain plug at the bottom of radiator, and then remove radiator cap. 

When draining all of engine coolant in the system, open water drain plugs on cylinder block. Refer
to 

EM-125, "DISASSEMBLY"

 .

SMA412B

Testing pressure

: 157 kPa (1.6 kg/cm

2

 , 23 psi)

PBIC5121J

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: Radiator drain plug hole

2

: Front engine under cover

: Engine front

PBIC3395E

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ENGINE COOLANT

4.

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

5.

Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to 

CO-13, "FLUSHING COOLING SYSTEM"

 .

REFILLING ENGINE COOLANT

1.

Install reservoir tank if removed, and radiator drain plug.

CAUTION:

Be sure to clean drain plug and install with new O-ring.

If water drain plugs on cylinder block are removed, close and tighten them. Refer to 

EM-129,

"ASSEMBLY"

 .

2.

Make sure that each hose clamp has been firmly tightened.

3.

Remove air relief plug on heater hose.

4.

Fill radiator, and reservoir tank if removed, to specified level.

●

Pour engine coolant through engine coolant filler neck
slowly of less than 2  (2-1/8 US qt, 1-3/4 lmp qt) a minute
to allow air in system to escape.

●

Use Genuine NISSAN Long Life Antifreeze/Coolant or
equivalent mixed with water (distilled or demineralized).
Refer to 

MA-12, "RECOMMENDED FLUIDS AND LUBRI-

CANTS"

 .

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When engine coolant overflows air relief hole on heater hose,
install air relief plug with new O-ring.

5.

Install radiator cap.

6.

Warm up engine until opening thermostat. Standard for warming-up time is approximately 10 minutes at
3,000 rpm.

●

Make sure thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.

CAUTION:

Watch water temperature gauge so as not to overheat engine.

Radiator drain plug:             

 : 1.2 N·m (0.12 kg-m, 11 in-lb)

SBIA0445E

Engine coolant capacity
(With reservoir tank at “MAX” level)

: Approximately 8.9   (9-3/8 US qt, 7-7/8 lmp qt)

SMA182B

Reservoir tank engine coolant capacity 
(At “MAX” level)

: 0.8   (7/8 US qt, 3/4 lmp qt)

Air relief plug:

: 1.2 N·m (0.12 kg-m, 11 in-lb)

SMA412B