Infiniti FX35, FX50 (S51). Manual - part 447

ENGINE COOLANT

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PERIODIC MAINTENANCE

ENGINE COOLANT

Inspection

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LEVEL 

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

to “MAX” when the engine is cool.

• Adjust the engine coolant level if necessary.
• Check that the reservoir tank cap is tightened.

LEAKAGE

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

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

WARNING:

Never remove radiator cap when engine is hot. Serious burns
could occur from high-pressure engine coolant escaping from
water inlet.

CAUTION:

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

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

Draining

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WARNING:

• Never change engine coolant when the engine is hot to avoid being scalded.
• 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.

1.

Open radiator drain plug (2) at the bottom of radiator, and then
remove radiator cap. 

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

EM-202, "Setting"

.

2.

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

3.

Check drained engine coolant for contaminants such as rust, corrosion or discoloration.

A

:  MAX

B

:  MIN

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Testing pressure

: Refer to 

CO-49, "Radiator"

.

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1

: Engine under cover

A

: Radiator drain plug hole

: Vehicle front

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ENGINE COOLANT

If contaminated, flush the engine cooling system. Refer to 

CO-35, "Flushing"

.

Refilling

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1.

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

EM-174, "Exploded View"

.

2.

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 plug on cylinder block is removed, close and tighten it. Refer to 

EM-256, "Disassem-

bly and Assembly"

.

3.

Check that each hose clamp is firmly tightened.

4.

Remove air relief plug (2) on radiator left side. 

5.

Remove air relief plug (1) on heater hose.

6.

Fill water inlet, 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 an

equivalent mixed with water (distilled or demineralized).
Refer to 

MA-12, "Fluids and Lubricants"

.

: 1.2 N·m (0.12 kg-m, 11 in-lb)

1

: Reservoir tank

3

: Water inlet

: Vehicle front

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: Vehicle front

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Engine coolant capacity

: Refer to 

CO-49, 

"Periodical Maintenance

Specification"

.

(With reservoir tank at 
“MAX” level)

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ENGINE COOLANT

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7.

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

8.

Repeat step 6.

9.

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

10. Install radiator cap.

11. Warm up engine until opening thermostat. Standard for warming-up time is approximately 10 minutes at

3,000 rpm.
• Check 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.

12. Stop the engine and cool down to less than approximately 50

°

C (122

°

F).

• Cool down using fan to reduce the time.
• If necessary, refill radiator up to filler neck with engine coolant.

13. Refill reservoir tank to “MAX” level line with engine coolant.

14. Repeat steps 10 through 13 two or more times with radiator cap installed until engine coolant level no

longer drops. 

15. Check cooling system for leakage with engine running.

16. Warm up the engine, and check for sound of engine coolant flow while running engine from idle up to

3,000 rpm with heater temperature controller set at several position between “COOL” and “WARM”.
• Sound may be heard from the heater unit.

17. Repeat step 16 three times.

18. If sound is heard, bleed air from cooling system by repeating step 6, and steps from 10 to 17 until engine

coolant level no longer drops. 

19. Check that the reservoir tank cap is tightened.

Flushing

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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 plug on cylinder block is removed, close and tighten it. Refer to 

EM-256, "Disassem-

bly and Assembly"

.

Reservoir tank engine cool-
ant capacity

: Refer to 

CO-49, 

"Periodical Maintenanc
e Specification"

.

(At “MAX” level)

A

: MAX 

B

:  MIN

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: 1.2 N·m (0.12 kg-m, 11 in-lb)

: 1.2 N·m (0.12 kg-m, 11 in-lb)

: 1.2 N·m (0.12 kg-m, 11 in-lb)

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ENGINE COOLANT

2.

Remove air relief plug (1) on heater hose.

3.

Remove air relief plug (2) on radiator.

4.

Fill water inlet with water until water spills from the air relief holes, then close air relief plugs. Fill water inlet
and reservoir tank with water and reinstall radiator cap.

5.

Run the engine and warm it up to normal operating temperature.

6.

Rev the engine two or three times under no-load.

7.

Stop the engine and wait until it cools down.

8.

Drain water from the system. Refer to 

CO-33, "Draining"

.

9.

Repeat steps 1 through 8 until clear water begins to drain from radiator.

10. Check that the reservoir tank cap is tightened.

: Vehicle front

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1

: Reservoir tank

3

: Water inlet

: Vehicle front

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: 1.2 N·m (0.12 kg-m, 11 in-lb)