Nissan Maxima. Manual - part 299

CO-8

< SYSTEM DESCRIPTION >

[VQ35DE]

COOLING SYSTEM

COOLING SYSTEM

Cooling Circuit

INFOID:0000000009469262

1.

Cylinder block (RH)

2.

Oil cooler

3.

Cylinder head (RH)

4.

Water pump

5.

Radiator

6.

Water inlet

7.

Thermostat

8.

Cylinder head (LH)

9.

Cylinder block (LH)

A.

To heater

B.

To electric throttle control actuator

C. From heater

D.

From electric throttle control actuator

AWBIA1460ZZ

COOLING SYSTEM

CO-9

< SYSTEM DESCRIPTION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

Schematic

INFOID:0000000009469263

WBIA0562E

CO-10

< PERIODIC MAINTENANCE >

[VQ35DE]

ENGINE COOLANT

PERIODIC MAINTENANCE

ENGINE COOLANT

System Inspection

INFOID:0000000009469264

WARNING:

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

coolant escaping from the radiator. Wrap a thick cloth around the radiator cap. Slowly turn it a quarter

turn to allow built-up pressure to escape. Carefully remove the radiator cap by 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 TANK LEVEL

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

range when the engine is cool.

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

CHECKING COOLING SYSTEM FOR LEAKS

To check for leaks, apply pressure to the cooling system using suit-

able tool and Tool.

WARNING:

Do not remove the radiator cap when the engine is 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

1. Inspect the radiator cap.

• Replace the radiator cap if the metal plunger cannot be seen around the edge of the black rubber gas-

ket.

• Replace the radiator 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)

Leakage test pressure

: Refer to 

CO-27, "Radiator"

.

WBIA0568E

ENGINE COOLANT

CO-11

< PERIODIC MAINTENANCE >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

2. Pull the negative-pressure valve to open it and check that it

closes completely when released.

• Check that there is no dirt or damage on the valve seat of the

radiator cap negative-pressure valve. 

• Check that there are no abnormalities in the opening and clos-

ing conditions of the negative-pressure valve.

3. Check radiator cap relief pressure using suitable tool and Tool.

• When connecting the radiator cap to the tester, apply water or

coolant to the radiator cap seal surface. 

• Replace the radiator cap if there is an abnormality in the nega-

tive-pressure valve, or if the open-valve pressure is outside of

the standard values.

CHECKING RADIATOR

Check radiator for mud or clogging. If necessary, clean radiator as follows.

CAUTION:

• Be careful not to bend or damage the radiator fins.

• When radiator is cleaned on-vehicle, remove surrounding parts in order to access the radiator core.

Tape the harness and electrical connectors to prevent water from entering.

1. Spray water to the back side of the radiator core using a side to side motion from the top down. 
2. Stop spraying when debris no longer flows from radiator core. 
3. Blow air into the back side of radiator core using a side to side motion from the top down.

• Use compressed air lower than 490 kPa (5 kg/cm

2

, 71 psi) and keep distance more than 30 cm (11.8 in). 

4. Continue to blow air until no water sprays out.
5. Check for coolant leaks. Repair as necessary.

Changing Engine Coolant

INFOID:0000000009469265

WARNING:

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

coolant escaping from the radiator. Wrap a thick cloth around the radiator cap. Slowly turn it a quarter

turn to allow built-up pressure to escape. Carefully remove the radiator cap by turning it all the way.    

DRAINING ENGINE COOLANT

1. Remove the engine under cover. Refer to 

EM-23, "Removal and Installation"

.

2. Open radiator drain plug at the bottom of radiator and remove the radiator cap. This is the only step

required for a partial cooling system drain. 

CAUTION:

Do not allow the coolant to contact drive belt.

3. If removing the heater core, remove the upper heater hose from the engine coolant outlet and apply mod-

erate air pressure of 103.46 kPa (1.055 kg-cm

2

, 15 psi) maximum for 30 seconds into the hose to blow out

excess coolant from the core.

4. For a complete cooling system drain, remove the reservoir tank and drain the coolant, and then clean the

reservoir tank before installation.

CAUTION:

Do not allow the coolant to contact drive belt.

Standard stroke: 0.7 mm – 1.7 mm (0.03 – 0.07 in)

SMA967B

Tool number

: EG17650301 (J-33984-A)

Standard

: Refer to 

CO-27, "Radiator"

.

WBIA0570E