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B ENGINE

ENGINE COOLING SYSTEM
SECTION CO CO

E
CONTENTS
MR20DE WATER PUMP ......................................................... 16
. F
Components .......................................................... 16
.
PRECAUTIONS ......................................................... 3. Removal and Installation ....................................... 16
.
Precautions for Supplemental Restraint System REMOVAL .......................................................... 16
. G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- INSPECTION AFTER REMOVAL ...................... 16 .
SIONER" ................................................................. 3
. INSTALLATION .................................................. 16
.
Precautions Necessary for Steering Wheel Rotation INSPECTION AFTER INSTALLATION ............... 16 .
After Battery Disconnect ......................................... 3 . H
COOLING FAN ......................................................... 17
.
OPERATION PROCEDURE ................................ 3 . Components .......................................................... 17
.
Precautions for Liquid Gasket ................................. 3 . Removal and Installation ....................................... 17
.
REMOVAL OF LIQUID GASKET SEALING ......... 3 . REMOVAL .......................................................... 17
. I
LIQUID GASKET APPLICATION PROCEDURE 4 ..... INSTALLATION .................................................. 17
.
PREPARATION .......................................................... 5
. THERMOSTAT ......................................................... 18
.
Special Service Tools .............................................. 5. Components .......................................................... 18
. J
Commercial Service Tools ....................................... 5 . Removal and Installation ....................................... 19
.
OVERHEATING CAUSE ANALYSIS ......................... 6 . REMOVAL .......................................................... 19
.
Troubleshooting Chart ............................................. 6 . INSPECTION AFTER REMOVAL ...................... 19 .
COOLING SYSTEM ................................................... 8 . K
INSTALLATION .................................................. 19
.
Cooling Circuit (M/T models) ................................... 8 . INSPECTION AFTER INSTALLATION ............... 20 .
ENGINE COOLANT ................................................. 10 . WATER OUTLET AND WATER CONTROL VALVE 21 ...
Inspection .............................................................. 10
. Components .......................................................... 21
. L
LEVEL CHECK .................................................. 10 . Removal and Installation ....................................... 22
.
CHECKING COOLING SYSTEM FOR LEAKS ... 10 REMOVAL .......................................................... 22
.
Changing Engine Coolant ..................................... 10 . INSPECTION AFTER REMOVAL ...................... 23 . M
DRAINING ENGINE COOLANT ........................ 10 . INSTALLATION .................................................. 23
.
REFILLING ENGINE COOLANT ....................... 10 . INSPECTION AFTER INSTALLATION ............... 24 .
FLUSHING COOLING SYSTEM ........................ 12 . SERVICE DATA AND SPECIFICATIONS (SDS) ..... 25 .
RADIATOR ............................................................... 13
. Standard and Limit ................................................. 25
.
Components .......................................................... 13
. CAPACITY .......................................................... 25
.
Removal and Installation ....................................... 13 . THERMOSTAT ................................................... 25
.
REMOVAL .......................................................... 14
. WATER CONTROL VALVE ................................ 25 .
INSTALLATION .................................................. 14 . RADIATOR ......................................................... 25
.
INSPECTION AFTER INSTALLATION .............. 14 .
Checking Radiator Cap ......................................... 14 .
Checking Radiator ................................................. 15.
QR25DE
PRECAUTIONS ....................................................... 26
.
Precautions for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-

Revision: December 2006 CO-1 2007 Sentra
SIONER" ................................................................ 26
. COOLINGFAN ..........................................................39 .
Precautions for Liquid Gasket ............................... 26 . Removal and Installation ........................................39 .
REMOVAL OF LIQUID GASKET SEALING ....... 26 . REMOVAL ...........................................................39.
LIQUID GASKET APPLICATION PROCEDURE 26 ... INSTALLATION ...................................................39 .
PREPARATION ........................................................ 28
. Disassembly and Assembly ...................................39 .
Special Service Tools ............................................ 28. DISASSEMBLY ...................................................39 .
Commercial Service Tools ..................................... 28 . ASSEMBLY .........................................................39 .
OVERHEATING CAUSE ANALYSIS ....................... 30 . WATER PUMP ..........................................................40 .
Troubleshooting Chart ........................................... 30 . Removal and Installation ........................................40 .
COOLING SYSTEM ................................................. 31 . REMOVAL ...........................................................40.
Cooling Circuit ....................................................... 31
. INSPECTION AFTER REMOVAL .......................41 .
System Drawing .................................................... 32
. INSTALLATION ...................................................41 .
ENGINE COOLANT ................................................. 33 . INSPECTION AFTER INSTALLATION ...............41 .
System Check ....................................................... 33
. THERMOSTAT AND THERMOSTAT HOUSING ......42 .
CHECKING COOLING SYSTEM HOSES .......... 33 . Removal and Installation ........................................42 .
CHECKING RESERVOIR LEVEL ...................... 33 . REMOVAL ...........................................................42.
CHECKING COOLING SYSTEM FOR LEAKS ... 33 INSPECTION AFTER REMOVAL .......................43 .
CHECKING RADIATOR CAP ............................. 33 . INSTALLATION ...................................................43 .
CHECKING RADIATOR ..................................... 34 . WATER CONTROL VALVE ......................................44 .
Changing Engine Coolant ...................................... 34 . Removal and Installation ........................................44 .
DRAINING ENGINE COOLANT ......................... 34 . REMOVAL ...........................................................44.
REFILLING ENGINE COOLANT ........................ 35 . INSPECTION AFTER REMOVAL .......................45 .
FLUSHING COOLING SYSTEM ........................ 36 . INSTALLATION ...................................................45 .
RADIATOR ............................................................... 37
. SERVICE DATA AND SPECIFICATIONS (SDS) .....46 .
Removal and Installation ....................................... 37 . Capacity .................................................................46
.
REMOVAL .......................................................... 38
. Thermostat .............................................................46
.
INSTALLATION ................................................... 38. Water Control Valve ...............................................46 .
INSPECTION ...................................................... 38
. Radiator .................................................................46
.

Revision: December 2006 CO-2 2007 Sentra
PRECAUTIONS
[MR20DE]
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EBS00Z5N

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
G 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
G 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
G 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 Necessary for Steering Wheel Rotation After Battery Disconnect
EBS00Z5O

NOTE: H
G This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT
SYSTEM).
G Remove and install all control units after disconnecting both battery cables with the ignition knob in the I
LOCK position.
G Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing
work. If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
J
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible. K
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE L
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged. M
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ACC position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
5. When the repair work is completed, return the ignition switch to the LOCK position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of all control units using CONSULT-III.

Precautions for Liquid Gasket EBS00Z5P

REMOVAL OF LIQUID GASKET SEALING
G After removing nuts and bolts, separate the mating surface, using Tool and remove old liquid gasket seal-
ing.

Revision: December 2006 CO-3 2007 Sentra
PRECAUTIONS
[MR20DE]
Tool number : KV10111100 (J-37228)
CAUTION:
Be careful not to damage the mating surfaces.
G Tap Tool to insert it (1), and then slide it by tapping on the side
(2) as shown.
G In areas where Tool is difficult to use, use plastic hammer to
lightly tap the parts, to remove it.
CAUTION:
If for some unavoidable reason suitable tool such as screw-
driver is used, be careful not to damage the mating sur- WBIA0566E

faces.
LIQUID GASKET APPLICATION PROCEDURE
1. Remove old liquid gasket adhering to the liquid gasket applica-
tion surface and the mating surface, using scraper.
G 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.
3. Attach liquid gasket tube to Tool.
Tool number : WS39930000 ( -- )

PBIC0003E

WBIA0567E

Use Genuine RTV Silicone Sealant or equivalent. Refer to GI-44, "Recommended Chemical Prod-
ucts and Sealants" .
4. Apply liquid gasket without breaks to the specified location with the specified dimensions.
G If there is a groove for the liquid gasket application, apply liquid gasket to the groove.

G 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.
G Within five minutes of liquid gasket application, install the mat-
ing component.
G If liquid gasket protrudes, wipe it off immediately.

G Do not retighten nuts or bolts after the installation.

G 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: December 2006 CO-4 2007 Sentra
PREPARATION
[MR20DE]
PREPARATION PFP:00002
A
Special Service Tools EBS00Z5Q

The actual shapes of Kent-Moore tools may from those of special service tools illustrated here.
Tool number Description
CO
(Kent-Moore No.)
Tool name
WS39930000 Pressing the tube of liquid gasket
( -- ) C
Tube pressure

S-NT052

EG17650301 Adapting radiator cap tester to radiator cap E
(J-33984-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. F
Unit: mm (in)

S-NT564
G
KV10111100 Removing chain tensioner cover and water
(J-37228) pump cover
Seal cutter
H

NT046 I
KV991J0070 Refilling engine cooling system
(J-45695)
Coolant Refill Tool J

K
LMA053

-- Checking concentration of ethylene glycol in
(J-23688) engine coolant
L
Engine coolant refractometer

WBIA0539E

Commercial Service Tools EBS00Z5R

Tool name Description
Radiator cap tester Checking radiator and radiator cap

PBIC1982E

Revision: December 2006 CO-5 2007 Sentra
OVERHEATING CAUSE ANALYSIS
[MR20DE]
OVERHEATING CAUSE ANALYSIS PFP:00012

Troubleshooting Chart EBS00Z5S

Symptom Check items
Water pump malfunction Worn or loose drive belt
Thermostat stuck closed Thermostat
Dust contamination or
Poor heat transfer Damaged fins paper clogging --
Physical 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- --
tion Fan assembly

Damaged fan blades
Damaged radiator shroud -- --
Improper engine coolant
Cooling sys- -- -- --
mixture ratio
tem parts Engine coolant viscosity
malfunction Poor engine coolant quality -- --
Loose clamp
Cooling hose
Cracked hose
Water pump Poor sealing
Loose
Radiator cap
Poor sealing
Engine coolant leaks
O-ring for damage, deterio-
Insufficient engine 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

Revision: December 2006 CO-6 2007 Sentra
OVERHEATING CAUSE ANALYSIS
[MR20DE]
Symptom Check items
A
High engine rpm under no
load
Driving in low gear for
Abusive driving CO
extended time
Driving at extremely high
speed
-- Overload on engine C
Power train system mal-
function
Installed improper size
Except cool- wheels and tires -- D
ing system
parts mal- Dragging brakes
function Improper ignition timing
E
Blocked bumper --
Installed front bumper fas-
cia cover
Blocked radiator grille F
Mud contamination or
Blocked or restricted air
paper clogging --
flow
Blocked radiator
-- G
Blocked condenser
Blocked air flow
Installed large fog lamp

Revision: December 2006 CO-7 2007 Sentra
COOLING SYSTEM
[MR20DE]
COOLING SYSTEM PFP:21020

Cooling Circuit (M/T models) EBS00Z5T

PBIC4719E

Revision: December 2006 CO-8 2007 Sentra
COOLING SYSTEM
[MR20DE]
(CVT models)
A

WBIA0815E

Revision: December 2006 CO-9 2007 Sentra
ENGINE COOLANT
[MR20DE]
ENGINE COOLANT PFP:KQ100

Inspection EBS00Z5U

LEVEL CHECK
G Check if the reservoir tank engine coolant level is within the
"MIN" to "MAX" range when engine is cool.
G Adjust the engine coolant level as necessary.

SMA412B

CHECKING COOLING SYSTEM FOR LEAKS
To check for leaks, apply pressure to the cooling system using Tool.
Tool number : EG17650301 (J-33984-A)

Testing pressure : 157 kPa (1.6 kg/cm2 , 23 psi)
WARNING:
Never 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. WBIA0568E

Changing Engine Coolant EBS00Z5V

WARNING:
G To avoid being scalded, do not change engine coolant when engine is hot.
G Wrap a thick cloth around radiator cap and carefully remove the cap. First, turn the cap a quarter
of a turn to release built-up pressure. Then turn the cap all the way.
G Be careful not to allow engine coolant to contact drive belt.
DRAINING ENGINE COOLANT
1. Open radiator drain plug (1) at the bottom of radiator, and then
remove radiator cap.
G Front
When drain all of engine coolant in the system, open water
drain plug on cylinder block. Refer to EM-74, "CYLINDER
BLOCK" .
CAUTION:
G Perform this step when engine is cold.

G Do not spill engine coolant on drive belt.

PBIC3799E

2. Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.
Refer to CO-13, "RADIATOR" .
3. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to CO-12, "FLUSHING COOLING SYSTEM" .
REFILLING ENGINE COOLANT
1. Install the radiator drain plug. Install the reservoir tank and cylinder block drain plug, if removed for a total
system drain or for engine removal or repair.
G The radiator must be completely empty of coolant and water.

Revision: December 2006 CO-10 2007 Sentra
ENGINE COOLANT
[MR20DE]
G Apply sealant to the threads of the cylinder block drain plugs. Use Genuine High Performance
Thread Sealant or equivalent. Refer to GI-44, "Recommended Chemical Products and Sealants" A
.

Radiator drain plug : Refer to CO-13, "Components" .
CO
Cylinder block drain plug : Refer to EM-181, "Removal and Installation" .
2. If disconnected, reattach the upper radiator hose at the engine side.
3. Set the vehicle heater controls to the full HOT and heater ON position. Turn the vehicle ignition ON with C
the engine OFF as necessary to activate the heater mode.
4. Install the Tool by installing the radiator cap adapter onto the
radiator neck opening. Then attach the gauge body assembly D
with the refill tube and the venturi assembly to the radiator cap
adapter.
Tool number : KV991J0070 (J-45695) E
5. Insert the refill hose into the coolant mixture container that is
placed at floor level. Make sure the ball valve is in the closed
position. F
G Use Genuine NISSAN Long Life Anti-freeze coolant or
equivalent, mixed 50/50 with distilled water or demineral-
ized water. G
Refer to MA-16, "Anti-freeze Coolant Mixture Ratio".

Engine coolant capacity : Refer to MA-14, "REC- H
(with reservoir tank) OMMENDED FLUIDS AND
LUBRICANTS" .
6. Install an air hose to the venturi assembly, the air pressure must I
be within specification.
Compressed air : 5.7 - 8.5 kPa (5.6 - 8.4 kg/cm2
supply pressure , 80 - 120 psi) J
LLIA0058E

CAUTION:
The compressed air supply must be equipped with an air dryer.
7. The vacuum gauge will begin to rise and there will be an audible hissing noise. During this process open K
the ball valve on the refill hose slightly. Coolant will be visible rising in the refill hose. Once the refill hose is
full of coolant, close the ball valve. This will purge any air trapped in the refill hose.
L
8. Continue to draw the vacuum until the gauge reaches 28 inches
of vacuum. The gauge may not reach 28 inches in high altitude
locations, refer to the vacuum specifications based on the alti-
M
tude above sea level.
Altitude above sea level Vacuum gauge reading
0 - 100 m (328 ft) : 28 inches of vacuum
300 m (984 ft) : 27 inches of vacuum
500 m (1,641 ft) : 26 inches of vacuum
1,000 m (3,281 ft) : 24 - 25 inches of vacuum
LLIA0057E

9. When the vacuum gauge has reached the specified amount, disconnect the air hose and wait 20 seconds
to see if the system loses any vacuum. If the vacuum level drops, perform any necessary repairs to the
system and repeat steps 6 - 8 to bring the vacuum to the specified amount. Recheck for any leaks.
10. Place the coolant container (with the refill hose inserted) at the same level as the top of the radiator. Then
open the ball valve on the refill hose so the coolant will be drawn up to fill the cooling system. The cooling
system is full when the vacuum gauge reads zero.
CAUTION:
Do not allow the coolant container to get too low when filling, to avoid air from being drawn into
the cooling system.
Revision: December 2006 CO-11 2007 Sentra
ENGINE COOLANT
[MR20DE]
11. Remove the Tool from the radiator neck opening.
12. Fill the cooling system reservoir tank to the specified level and install the radiator cap. Run the engine to
warm up the cooling system and top up the system as necessary.
FLUSHING COOLING SYSTEM
1. Install reservoir tank if removed. Refer to CO-13, "RADIATOR" .
2. Install radiator drain plug.
G If water drain plug on cylinder block is removed, close and tighten it. Refer to EM-74, "CYLIN-
DER BLOCK" .
CAUTION:
Be sure to clean radiator drain plug and install with new O-ring. Refer to CO-13, "Components" .
3. Fill radiator and reservoir tank with water and reinstall radiator cap.
4. Run engine and warm it up to normal operating temperature.
5. Rev engine two or three times under no-load.
6. Stop engine and wait until it cools down.
7. Drain water from the cooling system. Refer to CO-10, "DRAINING ENGINE COOLANT" .
8. Repeat steps 1 through 7 until clear water begins to drain from radiator.

Revision: December 2006 CO-12 2007 Sentra
RADIATOR
[MR20DE]
RADIATOR PFP:21400
A
Components EBS00Z5W

WBIA0816E

1. Reservoir tank cap 2. Reservoir tank 3. Reservoir tank hose
4. Mounting rubber (upper) 5. Radiator upper mounts 6. Radiator cap
7. Radiator 8. Mounting rubber (lower) 9. Radiator hose (lower)
10. Radiator hose (upper) 11. Cooling fan assembly A. To water outlet
B. To water inlet

Removal and Installation EBS00Z5X

WARNING:
Do not remove radiator cap when the engine is hot. Serious burns could occur from high-pressure
engine coolant escaping from radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter of a
turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

Revision: December 2006 CO-13 2007 Sentra
RADIATOR
[MR20DE]
REMOVAL
1. Drain engine coolant from radiator. Refer to CO-10, "Changing Engine Coolant" .
CAUTION:
G Perform this step when engine is cold.

G Do not spill engine coolant on drive belt.

2. Remove air duct (inlet). Refer to EM-18, "AIR CLEANER AND AIR DUCT" .
3. Disconnect reservoir tank hose.

4. Disconnect harness connector from fan motors, and move harness to aside.
5. Remove radiator hoses (upper and lower).
6. Remove radiator upper mounts.
7. Move radiator assembly to the rearward direction of vehicle, and then lift it upward to remove.
CAUTION:
Do not damage or scratch A/C condenser if equipped and radiator core when removing.
INSTALLATION
Installation is the reverse order of removal.
CAUTION:
Do not damage or scratch A/C condenser if equipped and radiator core when removing.
INSPECTION AFTER INSTALLATION
G Check for leaks of engine coolant. Refer to CO-10, "LEVEL CHECK" .
G Start and warm up engine. Visually check if there is no leaks of engine coolant and CVT fluid if equipped.
Refer to CVT-15, "CVT FLUID" .
Checking Radiator Cap EBS00Z5Y

G Check valve seat of radiator cap.

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