Infiniti Q45. Manual - part 281

RADIATOR (ALUMINUM TYPE)

CO-17

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4.

Make sure that the rim is completely crimped down.

5.

Confirm that there is no leakage. Refer to 

CO-17, "INSPECTION"

 .

INSPECTION

1.

Apply pressure with the radiator cap tester adapter (SST) and
the radiator cap tester (commercial service tool).

●

Provide used radiator and connect it to tested radiator using
radiator hoses as shown in the figure.

NOTE:
The used radiator should be tested beforehand to confirm it
has no leakage. If used one is not available, it is possible to
use new service part as a radiator testing tool. 

WARNING:

To prevent the risk of the hose coming undone while under pressure, securely fasten it down with
a hose clamp.

CAUTION:

Attach a hose to A/T fluid cooler to seal its inlet and outlet. 

2.

Check for leakage by soaking radiator in the water container
with the testing pressure applied.

Standard height “H”

: 8.0 - 8.4 mm (0.315 - 0.331 in)

SLC554A

Testing pressure

: 157 kPa (1.6 kg/cm

2

 , 23 psi)

PBIC1658E

PBIC1699E

CO-18

COOLING FAN

COOLING FAN

PFP:21140

Removal and Installation

NBS001PR

REMOVAL

1.

Remove air duct (inlet), battery cover and air cleaner cover. Refer to 

EM-13, "ENGINE ROOM COVER"

 .

2.

Remove engine undercover with power tool.

3.

Drain engine coolant from radiator. Refer to 

CO-8, "Changing Engine Coolant"

 .

CAUTION:

Perform when engine is cold.

4.

Remove battery. Refer to 

SC-8, "Removal and Installation"

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5.

Disconnect radiator hoses (upper and lower).

6.

Remove A/T fluid cooler hose from fan shroud. 

7.

Disconnect harness connector from cooling fan motors.

8.

Remove cooling fan shroud mounting bolts. 

9.

Remove radiator mounting bracket. With radiator moved toward the vehicle front, lift up and remove cool-
ing fan shroud.

CAUTION:

Be careful not to scratch or damage radiator core.

INSTALLATION

Note the following, and install in the reverse order of removal. 

NOTE:
Cooling fan is controlled by ECM. For details, refer to 

EC-514, "DTC P1217 ENGINE OVER TEMPERATURE"

.

1.

Cooling fan motor 

2.

Cooling fan shroud

3.

Cooling fan (right)

4.

Cooling fan (left)

PBIC2777E

COOLING FAN

CO-19

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Disassembly and Assembly

NBS001PS

DISASSEMBLY

1.

Remove cooling fans.

2.

Remove cooling fan motors from cooling fan shroud.

INSPECTION AFTER DISASSEMBLY
Cooling Fan

Inspect cooling fan for crack or unusual bend.

●

If anything is found, replace cooling fan.

ASSEMBLY

Assemble is the reverse order of disassembly.

CAUTION:

Cooling fans are different between right and left. Be careful not to misassemble them.

CO-20

WATER PUMP

WATER PUMP

PFP:21020

Removal and Installation

NBS001PT

WARNING:

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

REMOVAL

1.

Drain engine coolant. Refer to 

CO-8, "Changing Engine Coolant"

 .

CAUTION:

Perform when engine is cold.

2.

Remove the following parts.

●

Engine undercover

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Air duct (inlet) and engine cover, refer to 

EM-13, "Removal and Installation"

 .

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Alternator, water pump and A/C compressor belt, refer to 

EM-14, "Removal and Installation"

 .

CAUTION:

Leave auto tensioner pulley in its fixed position when removing drive belt.

3.

Remove water pump pulley.

4.

Remove water pump.

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Remove water pump with lightly tapping it using wooden piece.

INSPECTION AFTER REMOVAL

●

Visually make sure that there is no significant dirt or rusting on
water pump body and vane.

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Make sure that there is no looseness in vane shaft, and that it
turns smoothly when rotated by hand.

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If there are any unusualness, replace water pump.

INSTALLATION

●

Install in the reverse order of removal.

1.

Water pump

2.

Water pump pulley

3.

Gasket

SBIA0420E

PBIC1539E