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ENGINE COOLING SYSTEM


B ENGINE

                                                                                                                                                                A




                                                                         ENGINE COOLING SYSTEM
                                                                                               SECTION                    CO                                    CO



                                                                                                                                                                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 December                                                   CO-1                                                       2006 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 December                                                   CO-2                                                       2006 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 December                                CO-3                                    2006 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 December                               CO-4                  2006 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 December                                         CO-5                                                2006 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 December       CO-6                                       2006 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 December                                         CO-7                                                2006 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 December                                            CO-8                                            2006 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 December        CO-9        2006 FX35/FX45
                          COOLING SYSTEM
                                              [VQ35DE]
System Chart                                           NBS003JT




                                                PBIC0847E




Revision: 2006 December       CO-10        2006 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 December                            CO-11                                     2006 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:
               : 1.18 N



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