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ENGINE COOLING SYSTEM
B ENGINE
A
CO
SECTION
ENGINE COOLING SYSTEM C
D
E
CONTENTS
VQ35DE COOLING FAN ......................................................... 21
. F
Components .......................................................... 21
.
PRECAUTIONS ......................................................... 3. Removal and Installation ....................................... 21 .
Precautions for Supplemental Restraint System REMOVAL .......................................................... 21
. G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- INSTALLATION .................................................. 21 .
SIONER" ................................................................. 3
. INSPECTION AFTER INSTALLATION ............... 21 .
Precautions for Liquid Gasket ................................. 3 . Disassembly and Assembly ................................... 21 .
REMOVAL OF LIQUID GASKET SEALING ......... 3 . H
DISASSEMBLY .................................................. 21 .
LIQUID GASKET APPLICATION PROCEDURE 3 ..... INSPECTION AFTER DISASSEMBLY ............... 21 .
PREPARATION .......................................................... 5
. ASSEMBLY ........................................................ 21.
Special Service Tools .............................................. 5. WATER PUMP ......................................................... 22. I
Commercial Service Tools ....................................... 6 . Components .......................................................... 22
.
OVERHEATING CAUSE ANALYSIS ......................... 7 . Removal and Installation ....................................... 22 .
Troubleshooting Chart ............................................. 7 . REMOVAL .......................................................... 22
. J
COOLING SYSTEM ................................................... 9 . INSPECTION AFTER REMOVAL ...................... 24 .
Cooling Circuit ......................................................... 9
. INSTALLATION .................................................. 24 .
System Chart ........................................................ 10
. INSPECTION AFTER INSTALLATION ............... 26 .
ENGINE COOLANT ..................................................11 . K
WATER INLET AND THERMOSTAT ASSEMBLY ... 27
Inspection ...............................................................11
. Components .......................................................... 27
.
LEVEL CHECK ...................................................11 . Removal and Installation ....................................... 27 .
LEAK CHECK .....................................................11 . REMOVAL .......................................................... 27
. L
Changing Engine Coolant ......................................11 . INSPECTION AFTER REMOVAL ...................... 28 .
DRAINING ENGINE COOLANT .........................11 . INSTALLATION .................................................. 28 .
REFILLING ENGINE COOLANT ....................... 12 . INSPECTION AFTER INSTALLATION ............... 28 . M
FLUSHING COOLING SYSTEM ........................ 13 . WATER OUTLET AND WATER PIPING .................. 29 .
RADIATOR ............................................................... 14
. Components .......................................................... 29
.
Components .......................................................... 14
. Removal and Installation ....................................... 29 .
Removal and Installation ....................................... 14 . REMOVAL .......................................................... 29
.
REMOVAL .......................................................... 14
. INSTALLATION .................................................. 30 .
INSTALLATION .................................................. 15 . INSPECTION AFTER INSTALLATION ............... 30 .
INSPECTION AFTER INSTALLATION .............. 15 . SERVICE DATA AND SPECIFICATIONS (SDS) ..... 31 .
Checking Radiator Cap ......................................... 15 . Standard and Limit ................................................. 31
.
Checking Radiator ................................................. 16. ENGINE COOLANT CAPACITY (APPROXI-
RADIATOR (ALUMINUM TYPE) ............................. 17 . MATE) ................................................................. 31
.
Components .......................................................... 17
. RADIATOR ......................................................... 31
.
Disassembly and Assembly .................................. 17 . THERMOSTAT ................................................... 31 .
PREPARATION .................................................. 17 .
DISASSEMBLY .................................................. 17 .
ASSEMBLY ........................................................ 18.
INSPECTION ..................................................... 20 .
Revision: 2006 July CO-1 2007 FX35/FX45
VK45DE COOLING FAN .........................................................49.
Components (Crankshaft Driven type) ...................49 .
PRECAUTIONS ........................................................ 32. Removal and Installation ........................................49 .
Precautions for Supplemental Restraint System REMOVAL ...........................................................49
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- INSPECTION AFTER REMOVAL .......................49 .
SIONER" ................................................................ 32
. INSTALLATION ...................................................49 .
PREPARATION ........................................................ 33. Components (Motor Driven Type) ..........................50 .
Special Service Tools ............................................ 33 . Removal and Installation ........................................50 .
Commercial Service Tools ..................................... 33 . REMOVAL ...........................................................50
.
OVERHEATING CAUSE ANALYSIS ....................... 34 . INSTALLATION ...................................................50 .
Troubleshooting Chart ........................................... 34 . Disassembly and Assembly (Motor Driven Type) ...50
COOLING SYSTEM ................................................. 36 . DISASSEMBLY ...................................................50 .
Cooling Circuit ....................................................... 36
. INSPECTION AFTER DISASSEMBLY ...............50 .
System Chart ......................................................... 37
. ASSEMBLY .........................................................50.
ENGINE COOLANT ................................................. 38 . WATER PUMP ..........................................................51.
Inspection .............................................................. 38
. Components ...........................................................51
.
LEVEL CHECK ................................................... 38 . Removal and Installation ........................................51 .
LEAK CHECK ..................................................... 38 . REMOVAL ...........................................................51
.
Changing Engine Coolant ...................................... 38 . INSPECTION AFTER REMOVAL .......................52 .
DRAINING ENGINE COOLANT ......................... 38 . INSTALLATION ...................................................52 .
REFILLING ENGINE COOLANT ........................ 39 . INSPECTION AFTER INSTALLATION ...............52 .
FLUSHING COOLING SYSTEM ........................ 40 . THERMOSTAT AND WATER CONTROL VALVE ....53 .
RADIATOR ............................................................... 41
. Components ...........................................................53
.
Components .......................................................... 41
. Removal and Installation ........................................54 .
Removal and Installation ....................................... 41 . REMOVAL ...........................................................54
.
REMOVAL .......................................................... 41
. INSPECTION AFTER REMOVAL .......................54 .
INSTALLATION ................................................... 43 . INSTALLATION ...................................................54 .
INSPECTION AFTER INSTALLATION ............... 43 . INSPECTION AFTER INSTALLATION ...............55 .
Checking Radiator Cap ......................................... 43 . SERVICE DATA AND SPECIFICATIONS (SDS) .....56 .
Checking Radiator ................................................. 44. Standard and Limit .................................................56.
RADIATOR (ALUMINUM TYPE) .............................. 45 . ENGINE COOLANT CAPACITY (APPROXI-
Components .......................................................... 45
. MATE) .................................................................56
.
Disassembly and Assembly ................................... 45 . RADIATOR ..........................................................56
.
PREPARATION .................................................. 45 . THERMOSTAT ....................................................56 .
DISASSEMBLY .................................................. 45 . WATER CONTROL VALVE .................................56 .
ASSEMBLY ........................................................ 46.
INSPECTION ...................................................... 48.
Revision: 2006 July CO-2 2007 FX35/FX45
PRECAUTIONS
[VQ35DE]
PRECAUTIONS
[VQ35DE] PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" NBS003JN
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along CO
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front C
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING: D
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer. E
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. F
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
G
Precautions for Liquid Gasket NBS003JO
REMOVAL OF LIQUID GASKET SEALING
q After removing mounting nuts and bolts, separate the mating H
surface using the seal cutter (SST) and remove old liquid gasket
sealing.
CAUTION: I
Be careful not to damage the mating surfaces.
q Tap the seal cutter to insert it, and then slide it by tapping on the
side as shown in the figure. J
q In areas where seal cutter is difficult to use, use a plastic ham-
mer to lightly tap the parts, to remove it.
CAUTION: PBIC0002E K
If for some unavoidable reason tool such as a screwdriver
is used, be careful not to damage the mating surfaces.
LIQUID GASKET APPLICATION PROCEDURE L
1. Using a scraper, remove old liquid gasket adhering to the liquid
gasket application surface and the mating surface.
q Remove liquid gasket completely from the groove of the liquid M
gasket application surface, mounting bolts, and bolt holes.
2. Wipe the liquid gasket application surface and the mating sur-
face with white gasoline (lighting and heating use) to remove
adhering moisture, grease and foreign materials.
PBIC0003E
Revision: 2006 July CO-3 2007 FX35/FX45
PRECAUTIONS
[VQ35DE]
3. Attach liquid gasket tube to the tube presser [SST: WS39930000
( -- )].
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-48, "RECOMMENDED CHEMICAL PRODUCTS AND
SEALANTS" .
4. Apply liquid gasket without breaks to the specified location with
the specified dimensions.
q If there is a groove for the liquid gasket application, apply liq-
uid gasket to the groove.
EMA0622D
q As for the bolt holes, normally apply liquid gasket inside the
holes. Occasionally, it should be applied outside the holes.
Make sure to read the text of service manual.
q Within five minutes of liquid gasket application, install the mat-
ing component.
q If liquid gasket protrudes, wipe it off immediately.
q Do not retighten after mounting bolts and nuts the installation.
q After 30 minutes or more have passed from the installation, fill
engine oil and engine coolant.
CAUTION: SEM159F
If there are specific instructions in this manual, observe them.
Revision: 2006 July CO-4 2007 FX35/FX45
PREPARATION
[VQ35DE]
PREPARATION PFP:00002
A
Special Service Tools NBS003JP
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number CO
(Kent-Moore No.) Description
Tool name
EG17650301 Adapting radiator cap tester to radiator cap
C
(J33984-A) and radiator filler neck
Radiator cap tester adapter a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia. D
Unit: mm (in)
S-NT564
KV99103510 Installing radiator upper and lower tanks
E
( -- )
Radiator plate pliers A
F
S-NT224
G
KV99103520 Removing radiator upper and lower tanks
( -- )
Radiator plate pliers B
H
I
S-NT225
KV10111100 Removing chain tensioner cover and water
(J37228) pump cover
Seal cutter J
K
NT046
WS39930000 Pressing the tube of liquid gasket
( -- ) L
Tube presser
M
S-NT052
Revision: 2006 July CO-5 2007 FX35/FX45
PREPARATION
[VQ35DE]
Commercial Service Tools NBS003JQ
Tool name Description
Power tool Loosening nuts and bolts
PBIC0190E
Radiator cap tester Checking radiator and radiator cap
PBIC1982E
Revision: 2006 July CO-6 2007 FX35/FX45
OVERHEATING CAUSE ANALYSIS
[VQ35DE]
OVERHEATING CAUSE ANALYSIS PFP:00012
A
Troubleshooting Chart NBS003JR
Symptom Check items
Water pump malfunction Worn or loose drive belt CO
Thermostat stuck closed --
Dust contamination or
C
Poor heat transfer Damaged fins paper clogging --
Physical damage
Clogged radiator cooling Excess foreign material D
tube (rust, dirt, sand, etc.)
Cooling fan does not oper-
ate
E
Reduced air flow High resistance to fan rota- Fan assembly --
tion
Damaged fan blades
F
Damaged radiator shroud -- -- --
Improper engine coolant
Cooling sys- -- -- --
mixture ratio G
tem parts
malfunction Poor engine coolant quality -- Engine coolant density --
Loose clamp
Cooling hose H
Cracked hose
Water pump Poor sealing
Loose
Radiator cap I
Poor sealing
Engine coolant leaks
O-ring for damage, deterio-
Insufficient engine coolant ration or improper fitting J
Radiator
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank K
Cylinder head deterioration
Exhaust gas leaks into
Overflowing reservoir tank Cylinder head gasket dete-
cooling system L
rioration
M
Revision: 2006 July CO-7 2007 FX35/FX45
OVERHEATING CAUSE ANALYSIS
[VQ35DE]
Symptom Check items
High engine rpm under no
load
Driving in low gear for
Abusive driving
extended time
Driving at extremely high
speed
-- Overload on engine
Powertrain system mal-
function
Installed improper size
Except cool- --
wheels and tires
ing system
parts mal- Dragging brakes
function
Improper ignition timing
Blocked bumper --
Installed car brassiere
Blocked radiator grille Mud contamination or
Blocked or restricted air paper clogging --
flow
Blocked radiator --
Blocked condenser
Blocked air flow
Installed large fog lamp
Revision: 2006 July CO-8 2007 FX35/FX45
COOLING SYSTEM
[VQ35DE]
COOLING SYSTEM PFP:21020
A
Cooling Circuit NBS003JS
CO
C
D
E
F
G
H
I
PBIC2073E
J
K
L
M
Revision: 2006 July CO-9 2007 FX35/FX45
COOLING SYSTEM
[VQ35DE]
System Chart NBS003JT
PBIC0847E
Revision: 2006 July CO-10 2007 FX35/FX45
ENGINE COOLANT
[VQ35DE]
ENGINE COOLANT PFP:KQ100
A
Inspection NBS003JU
LEVEL CHECK
q Check if the reservoir tank engine coolant level is within the CO
"MIN" to "MAX" when the engine is cool.
q Adjust the engine coolant level as necessary.
C
D
SMA412B
E
LEAK CHECK
q To check for leaks, apply pressure to the cooling system with the
radiator cap tester (commercial service tool) and radiator cap F
tester adapter (SST).
Testing pressure
G
: 157 kPa (1.6 kg/cm2 , 23 psi)
WARNING:
Do not remove radiator cap when engine is hot. Serious H
burns could occur from high-pressure engine coolant
escaping from radiator.
CAUTION: SLC756A
I
Higher test pressure than specified may cause radiator
damage.
NOTE:
In a case that engine coolant decreases, replenish radiator with engine coolant. J
q If anything is found, repair or replace damaged parts.
Changing Engine Coolant NBS003JV K
WARNING:
q To avoid being scalded, do not change engine coolant when the engine is hot.
q Wrap a thick cloth around radiator cap and carefully remove radiator cap. First, turn radiator cap a L
quarter of a turn to release built-up pressure. Then turn radiator cap all the way.
DRAINING ENGINE COOLANT
1. Remove front engine undercover with power tool. M
2. Open radiator drain plug at the bottom of radiator, and then
remove radiator cap.
SBIA0444E
When draining all of engine coolant in the system, open water drain plugs on cylinder block. Refer
to EM-124, "DISASSEMBLY" .
3. Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.
Revision: 2006 July CO-11 2007 FX35/FX45
ENGINE COOLANT
[VQ35DE]
4. 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.
Radiator drain plug:
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