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B ENGINE
A
CO
SECTION
ENGINE COOLING SYSTEM C
D
E
CONTENTS
QR25DE WATER PUMP ......................................................... 16 . F
Removal and Installation ....................................... 16 .
PRECAUTIONS ......................................................... 3
. REMOVAL .......................................................... 16.
Precautions for Supplemental Restraint System INSPECTION AFTER REMOVAL ...................... 17 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- INSTALLATION .................................................. 17 .
SIONER" ................................................................. 3
. INSPECTION AFTER INSTALLATION ............... 17 .
Precautions for Liquid Gasket ................................. 3 . THERMOSTAT AND THERMOSTAT HOUSING ..... 18 .
REMOVAL OF LIQUID GASKET SEALING ......... 3 . H
Removal and Installation ....................................... 18 .
LIQUID GASKET APPLICATION PROCEDURE 3 ..... REMOVAL .......................................................... 18.
PREPARATION .......................................................... 5
. INSPECTION AFTER REMOVAL ...................... 19 .
Special Service Tools .............................................. 5
. INSTALLATION .................................................. 19 . I
Commercial Service Tools ....................................... 5 . WATER CONTROL VALVE ...................................... 20 .
OVERHEATING CAUSE ANALYSIS ......................... 6 . Removal and Installation ....................................... 20 .
Troubleshooting Chart ............................................. 6
. REMOVAL .......................................................... 20. J
COOLING SYSTEM ................................................... 7 . INSPECTION AFTER REMOVAL ...................... 21 .
Cooling Circuit ......................................................... 7
. INSTALLATION .................................................. 21 .
System Drawing ...................................................... 8
. SERVICE DATA AND SPECIFICATIONS (SDS) ..... 22 .
ENGINE COOLANT ................................................... 9 . K
Capacity ................................................................. 22
.
System Check ......................................................... 9
. Thermostat ............................................................ 22
.
CHECKING COOLING SYSTEM HOSES ........... 9 . Water Control Valve ............................................... 22 .
CHECKING RESERVOIR LEVEL ........................ 9 . Radiator ................................................................. 22
. L
CHECKING COOLING SYSTEM FOR LEAKS..... 9
CHECKING RADIATOR CAP ............................... 9 .
CHECKING RADIATOR ..................................... 10 .
VQ35DE
M
Changing Engine Coolant ..................................... 10 . PRECAUTIONS ....................................................... 23.
DRAINING ENGINE COOLANT ........................ 10 . Precautions for Supplemental Restraint System
REFILLING ENGINE COOLANT ........................11 . (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
FLUSHING COOLING SYSTEM ........................ 12 . SIONER" ................................................................ 23
.
RADIATOR ............................................................... 13
. Precautions for Liquid Gasket ............................... 23 .
Removal and Installation ....................................... 13 . REMOVAL OF LIQUID GASKET SEALING ....... 23 .
REMOVAL .......................................................... 13
. LIQUID GASKET APPLICATION PROCEDURE 23 ...
INSTALLATION .................................................. 13. PREPARATION ........................................................ 25
.
INSPECTION ..................................................... 13
. Special Service Tools ............................................ 25.
COOLINGFAN ......................................................... 15
. Commercial Service Tools ..................................... 25 .
Removal and Installation ....................................... 15 . OVERHEATING CAUSE ANALYSIS ....................... 26 .
REMOVAL .......................................................... 15
. Troubleshooting Chart ........................................... 26 .
INSTALLATION .................................................. 15. COOLING SYSTEM ................................................. 28 .
Disassembly and Assembly .................................. 15 . Cooling Circuit ....................................................... 28
.
DISASSEMBLY .................................................. 15 . System Drawing .................................................... 29
.
ASSEMBLY ........................................................ 15
.
Revision: July 2005 CO-1 2006 Altima
ENGINE COOLANT ................................................. 30 . REMOVAL ...........................................................41.
System Check ....................................................... 30
. INSTALLATION ...................................................41 .
CHECKING COOLING SYSTEM HOSES .......... 30 . INSPECTION AFTER INSTALLATION ...............41 .
CHECKING RESERVOIR LEVEL ...................... 30 . Disassembly and Assembly of Radiator Fan .........41 .
CHECKING COOLING SYSTEM FOR LEAKS ... 30 DISASSEMBLY ...................................................41 .
CHECKING RADIATOR CAP ............................. 30 . ASSEMBLY .........................................................41 .
CHECKING RADIATOR ..................................... 31 . WATER PUMP ..........................................................42 .
Changing Engine Coolant ...................................... 31 . Removal and Installation ........................................42 .
DRAINING ENGINE COOLANT ......................... 31 . REMOVAL ...........................................................42.
REFILLING ENGINE COOLANT ........................ 32 . INSPECTION AFTER REMOVAL .......................44 .
FLUSHING COOLING SYSTEM ........................ 33 . INSTALLATION ...................................................44 .
RADIATOR ............................................................... 34
. THERMOSTAT AND THERMOSTAT HOUSING ......47 .
Removal and Installation ....................................... 34 . Removal and Installation ........................................47 .
REMOVAL .......................................................... 34
. REMOVAL ...........................................................47.
INSTALLATION ................................................... 35
. INSPECTION AFTER REMOVAL .......................47 .
Disassembly and Assembly ................................... 35 . INSTALLATION ...................................................48 .
PREPARATION .................................................. 36 . WATER OUTLET AND WATER PIPING ..................49 .
DISASSEMBLY .................................................. 36 . Removal and Installation ........................................49 .
ASSEMBLY ........................................................ 37
. REMOVAL ...........................................................49.
INSPECTION ...................................................... 39
. INSTALLATION ...................................................50 .
Disassembly and Assembly of Radiator Fan ......... 39 . SERVICE DATA AND SPECIFICATIONS (SDS) .....51 .
DISASSEMBLY .................................................. 39 . Capacity .................................................................51
.
ASSEMBLY ........................................................ 40
. Thermostat .............................................................51
.
COOLING FAN ......................................................... 41
. Radiator .................................................................51
.
Removal and Installation ....................................... 41 .
Revision: July 2005 CO-2 2006 Altima
PRECAUTIONS
[QR25DE]
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EBS00J7B
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 EBS00M84
REMOVAL OF LIQUID GASKET SEALING
q After removing nuts and bolts, separate the mating surface, using Tool and remove old liquid gasket seal- H
ing.
Tool number : KV10111100 (J-37228)
I
CAUTION:
Be careful not to damage the mating surfaces.
q Tap Tool to insert it, and then slide it by tapping on the side as
shown in the figure. J
q In areas where Tool is difficult to use, use plastic hammer to
lightly tap the parts, to remove it.
K
CAUTION:
If for some unavoidable reason suitable tool such as screw-
driver is used, be careful not to damage the mating sur- WBIA0566E
faces. L
LIQUID GASKET APPLICATION PROCEDURE
1. Remove old liquid gasket adhering to the liquid gasket applica-
tion surface and the mating surface, Using scraper. M
q Remove liquid gasket completely from the groove of the liquid
gasket application surface, bolts, and bolt holes.
2. Thoroughly clean the mating surfaces and remove adhering
moisture, grease and foreign materials.
PBIC0003E
Revision: July 2005 CO-3 2006 Altima
PRECAUTIONS
[QR25DE]
3. Attach liquid gasket tube to Tool.
Tool number : WS39930000 ( -- )
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "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.
WBIA0567E
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 nuts or bolts after 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: July 2005 CO-4 2006 Altima
PREPARATION
[QR25DE]
PREPARATION PFP:00002
A
Special Service Tools EBS00J7D
The actual shape of the Kent-Moore tools may differ from those tools illustrated here.
Tool number Description CO
(Kent-Moore No.)
Tool name
WS39930000 Pressing the tube of liquid gasket C
( -- )
Tube presser
D
S-NT052
E
EG17650301 Adapting radiator cap tester to radiator filler
(J-33984-A) neck:
Radiator cap tester adapter a: 28 (1.10) dia.
b: 31.4 (1.236) dia. F
c: 41.3 (1.626) dia.
Unit: mm (in)
S-NT564 G
KV10111100 Removing chain tensioner cover and water
(J-37228) pump cover
Seal cutter H
I
NT046
KV991J0070 Refilling engine cooling system
(J-45695) J
Coolant Refill Tool
K
LMA053
-- Checking concentration of ethylene glycol in L
(J-23688) engine coolant
Engine coolant refractometer
M
WBIA0539E
Commercial Service Tools EBS00J7E
Tool name Description
Power tool Loosening bolts and nuts
PBIC0190E
Revision: July 2005 CO-5 2006 Altima
OVERHEATING CAUSE ANALYSIS
[QR25DE]
OVERHEATING CAUSE ANALYSIS PFP:00012
Troubleshooting Chart EBS00J7F
Symptom Check items
Water pump malfunction Worn or loose drive belt
Thermostat stuck closed Coolant circulation
Dust contamination or rock
Poor heat transfer Damaged fins clogging --
Mechanical damage
Clogged radiator cooling Excess foreign material
tube (rust, dirt, sand, etc.)
Cooling fan does not oper-
ate
Reduced air flow High resistance to fan rota- Engine cooling fans --
tion
Damaged fan blades
Damaged radiator shroud -- -- --
Improper coolant mixture
Cooling sys- -- -- --
ratio
tem parts
malfunction Poor coolant quality -- Periodic maintenance --
Loose clamp
Cooling hose
Cracked hose
Water pump Poor sealing
Loose
Radiator cap
Poor sealing
Coolant leaks
O-ring for damage, deterio-
Insufficient coolant ration or improper fitting
Radiator
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Cylinder head deterioration
Exhaust gas leaks into
Overflowing reservoir tank Cylinder head gasket dete-
cooling system
rioration
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
Except cool-
ing system Installed improper size
wheels and tires --
parts mal-
function Dragging brakes
Improper ignition timing
Blocked radiator grille Installed car brassiere
Blocked bumper
Blocked or restricted air
Blocked radiator Mud contamination or --
flow
Blocked condenser paper clogging
Installed large fog lamp
Revision: July 2005 CO-6 2006 Altima
COOLING SYSTEM
[QR25DE]
COOLING SYSTEM PFP:21020
A
Cooling Circuit EBS00J7G
CO
C
D
E
F
G
H
I
WBIA0143E
J
K
L
M
Revision: July 2005 CO-7 2006 Altima
COOLING SYSTEM
[QR25DE]
System Drawing EBS00M85
PBIC0280E
Revision: July 2005 CO-8 2006 Altima
ENGINE COOLANT
[QR25DE]
ENGINE COOLANT PFP:KQ100
A
System Check EBS00M86
WARNING:
q Never remove the radiator cap when the engine is hot. Serious burns could occur from high pres- CO
sure fluid escaping from the radiator.
q Wrap a thick cloth around the cap. Slowly push down and turn it a quarter turn to allow built-up
pressure to escape. Carefully remove the cap by pushing down and turning it all the way. C
CHECKING COOLING SYSTEM HOSES
Check hoses for the following:
q Improper attachment D
q Leaks
q Cracks
E
q Damage
q Loose connections
q Chafing F
q Deterioration
CHECKING RESERVOIR LEVEL
q Check if the reservoir tank coolant level is within MIN to MAX G
when the engine is cool.
q Adjust coolant level if it is too much or too little.
H
I
J
SMA412B
CHECKING COOLING SYSTEM FOR LEAKS
To check for leakage, apply pressure to the cooling system using K
Tool.
Tool number : EG17650301 (J-33984-A)
L
Testing pressure : 157 kPa (1.6 kg/cm2 , 23 psi)
WARNING:
Never remove the radiator cap when the engine is hot. Serious M
burns could occur from high pressure coolant escaping from
the radiator.
CAUTION: WBIA0568E
Higher pressure than specified may cause radiator damage.
CHECKING RADIATOR CAP
1. Inspect the radiator cap.
q Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket.
q Replace the 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.
Revision: July 2005 CO-9 2006 Altima
ENGINE COOLANT
[QR25DE]
2. Pull the negative-pressure valve to open it and check that it
closes completely when released.
q Check that there is no dirt or damage on the valve seat of the
radiator cap negative-pressure valve.
q Check that there are no abnormalities in the opening and
closing conditions of the negative-pressure valve.
SMA967B
3. Check radiator cap relief pressure using Tool.
Tool number : EG17650301 (J-33984-A)
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