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B ENGINE

CO
SECTION
ENGINE COOLING SYSTEM C

E
CONTENTS
QG18DE SERVICE DATA AND SPECIFICATIONS (SDS) ..... 20 . F
Capacity ................................................................. 20
.
PRECAUTIONS ......................................................... 3. Thermostat ............................................................ 20
.
Precautions For Liquid Gasket ................................ 3 . Radiator ................................................................. 20
. G
REMOVAL OF LIQUID GASKET ......................... 3 .
LIQUID GASKET APPLICATION PROCEDURE 3 .....
PREPARATION .......................................................... 4
.
QR25DE
Special Service Tools .............................................. 4. H
PRECAUTIONS ....................................................... 21
.
OVERHEATING CAUSE ANALYSIS ......................... 5 . Precautions For Liquid Gasket .............................. 21 .
Overheating Cause Analysis ................................... 5 . REMOVAL OF LIQUID GASKET ........................ 21 .
COOLING SYSTEM ................................................... 7 . LIQUID GASKET APPLICATION PROCEDURE 21 ... I
Cooling Circuit ......................................................... 7
. PREPARATION ........................................................ 22
.
ENGINE COOLANT ................................................... 8 . Special Service Tools ............................................ 22
.
System Check ......................................................... 8
. OVERHEATING CAUSE ANALYSIS ....................... 23 . J
CHECKING COOLING SYSTEM HOSES ........... 8 . Troubleshooting Chart ........................................... 23.
CHECKING RESERVOIR LEVEL ........................ 8 . COOLING SYSTEM ................................................. 25 .
CHECKING COOLING SYSTEM FOR LEAKS..... 8 Cooling Circuit ....................................................... 25
.
CHECKING RADIATOR ....................................... 8 . K
ENGINE COOLANT ................................................. 26 .
CHECKING RADIATOR CAP ............................... 9 . System Check ....................................................... 26
.
Refilling Engine Coolant .......................................... 9 . CHECKING COOLING SYSTEM HOSES .......... 26 .
WATER PUMP ......................................................... 10. CHECKING RESERVOIR LEVEL ...................... 26 . L
Removal and Installation ....................................... 10 . CHECKING COOLING SYSTEM FOR LEAKS ... 26
Inspection ...............................................................11
. CHECKING RADIATOR ..................................... 26 .
THERMOSTAT AND THERMOSTAT HOUSING ..... 12 . CHECKING RADIATOR CAP ............................. 27 . M
Removal and Installation ....................................... 12 . Refilling Engine Coolant ........................................ 27.
REMOVAL .......................................................... 12
. WATER PUMP ......................................................... 28
.
INSPECTION AFTER REMOVAL ...................... 12 . Removal and Installation ....................................... 28 .
INSTALLATION .................................................. 13 . REMOVAL .......................................................... 28
.
RADIATOR ............................................................... 14
. INSPECTION AFTER REMOVAL ...................... 29 .
Removal and Installation ....................................... 14 . INSTALLATION .................................................. 29.
REMOVAL .......................................................... 14
. INSPECTION AFTER INSTALLATION ............... 29 .
INSTALLATION .................................................. 14 . THERMOSTAT AND THERMOSTAT HOUSING ..... 30 .
Disassembly and Assembly .................................. 15 . Removal and Installation ....................................... 30 .
PREPARATION ................................................. 15 . REMOVAL .......................................................... 30
.
DISASSEMBLY .................................................. 15 . INSPECTION AFTER REMOVAL ...................... 31 .
ASSEMBLY ........................................................ 16. INSTALLATION .................................................. 31.
Inspection .............................................................. 18
. RADIATOR ............................................................... 32
.
COOLING FAN ........................................................ 19. Removal and Installation ....................................... 32 .
Disassembly and Assembly Radiator Cooling Fan 19 ... REMOVAL .......................................................... 32
.
DISASSEMBLY .................................................. 19 . INSTALLATION .................................................. 32.
ASSEMBLY ........................................................ 19.

Revision: July 2005 CO-1 2005 Sentra
Disassembly and Assembly ................................... 33 . SERVICE DATA AND SPECIFICATIONS (SDS) .....38 .
PREPARATION .................................................. 33 . Capacity .................................................................38
.
DISASSEMBLY .................................................. 33 . Thermostat .............................................................38
.
ASSEMBLY ........................................................ 34. Water Control Valve ...............................................38 .
Inspection .............................................................. 36
. Radiator .................................................................38
.
COOLING FAN ......................................................... 37
.
Disassembly and Assembly ................................... 37 .
DISASSEMBLY .................................................. 37 .
ASSEMBLY ........................................................ 37.

Revision: July 2005 CO-2 2005 Sentra
PRECAUTIONS
[QG18DE]
PRECAUTIONS PFP:00001
A
Precautions For Liquid Gasket EBS00EYR

REMOVAL OF LIQUID GASKET
q After removing the bolts and nuts, disconnect and remove the CO
sealant using Tool.
Tool number : KV10111100 (J-37228)
CAUTION: C
Be careful not to damage the mating surfaces.
q In areas where the cutter is difficult to use, use a plastic hammer
to lightly tap the liquid gasket applied area. D
CAUTION:
If for some unavoidable reason a tool such as a flat-blade
screwdriver is used, be careful not to damage the mating sur- PBIC0275E
E
faces.
LIQUID GASKET APPLICATION PROCEDURE
1. Using a scraper, remove the old sealant adhering to the applica- F
tion surface and the mating surface.
q Remove the old sealant completely from the groove of the appli-
cation surface, mounting bolts, and bolt holes. G
2. Thoroughly clean the application surface and the mating surface
to remove adhering moisture, grease and foreign material.
3. Attach the sealant tube to the tube presser. H
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-46, "RECOMMENDED CHEMICAL PRODUCTS AND
SEALANTS" . I
PBIC0003E

4. Apply the sealant without breaks to the specified location with
the specified dimensions. J
q If there is a groove for the sealant application, apply the sealant
to the groove.
K

EMA0622D
M

q As for the bolt holes, normally apply the sealant inside the holes.
Occasionally, it should be applied outside the holes.
q Within five minutes of sealant application, install the mating
component.
q If the sealant protrudes, wipe it off immediately.
q Do not retighten after the installation.
q After 30 minutes or more have passed from the installation, fill
the engine with the specified oil and coolant. Refer to MA-13,
"RECOMMENDED FLUIDS AND LUBRICANTS" .
SEM164F

Revision: July 2005 CO-3 2005 Sentra
PREPARATION
[QG18DE]
PREPARATION PFP:00002

Special Service Tools EBS00CH2

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number Description
(Kent-Moore No.)
Tool name
EG17650301 Adapting radiator cap tester to radiator filler
(J33984-A) neck
Radiator cap tester adapter a: 28 (1.10) via.
b: 31.4 (1.236) via.
c: 41.3 (1.626) via.
Unit: mm (in)

NT564

KV99103510 Installing radiator upper and lower tanks
( -- )
Radiator plate pliers A

S-NT224

KV99103520 Removing radiator upper and lower tanks
( -- )
Radiator plate pliers B

S-NT225

KV10111100 Removing sealant
(J-37228)
Seal cutter

NT046

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

WBIA0539E

Revision: July 2005 CO-4 2005 Sentra
OVERHEATING CAUSE ANALYSIS
[QG18DE]
OVERHEATING CAUSE ANALYSIS PFP:00012
A
Overheating Cause Analysis EBS00CH3

Symptom Check items
Water pump malfunction Worn or loose drive belt CO
Thermostat stuck closed Coolant circulation
Dust contamination or
C
Poor heat transfer Damaged fins paper clogging --
Mechanical 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- Engine cooling fans --
tion
Damaged fan blades
F
Damaged radiator shroud -- -- --
Improper coolant mixture
Cooling sys- -- -- --
ratio G
tem parts
malfunction Poor coolant quality -- -- --
Loose clamp
Cooling hose H
Cracked hose
Water pump Poor sealing
Loose
Radiator cap I
Poor sealing
Coolant leaks
O-ring for damage, deterio-
Insufficient 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

Revision: July 2005 CO-5 2005 Sentra
OVERHEATING CAUSE ANALYSIS
[QG18DE]
Symptom Check items
High engine RPM under no
load
Driving in low gear for
Abusive driving
extended time
Driving at extremely high
speed
Over heating engine Overload on engine
Powertrain system mal-
function
Except cool- Installed improper size
ing system wheels and tires --
parts mal-
Dragging brakes
function
Improper ignition timing
Blocked bumper --
Installed car brassiere
Blocked radiator grille
Blocked or restricted air __ Mud, debris, or paper clog-
flow Blocked radiator -- ging

Blocked condenser
--
Installed large fog lamp

Revision: July 2005 CO-6 2005 Sentra
COOLING SYSTEM
[QG18DE]
COOLING SYSTEM PFP:21020
A
Cooling Circuit EBS00CH4

WBIA0132E

Revision: July 2005 CO-7 2005 Sentra
ENGINE COOLANT
[QG18DE]
ENGINE COOLANT PFP:KQ100

System Check EBS00CH5

WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
fluid escaping from the radiator.
Wrap a thick cloth around the cap. Slowly push down and turn it a quarter turn to allow built-up pres-
sure to escape. Carefully remove the cap by pushing down and turning it all the way.
CHECKING COOLING SYSTEM HOSES
Check hoses for the following:
q Improper attachment
q Leaks
q Cracks
q Damage
q Loose connections
q Chafing
q Deterioration
CHECKING RESERVOIR LEVEL
q Check if the reservoir tank coolant level is within MIN to MAX
when the engine is cool.
q Adjust coolant level if it is too much or too little.

SMA412B

CHECKING COOLING SYSTEM FOR LEAKS
To check for leakage, apply pressure to the cooling system using
Tool.
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.
SLC756A

CHECKING RADIATOR
Check radiator for mud or clogging. If necessary, clean radiator as follows:
q Be careful not to bend or damage the radiator fins.
q When radiator is cleaned without removal, remove all surrounding parts such as cooling fan, radiator
shroud and horns. Then tape the harness and connectors to prevent water from entering.
1. Apply water by hose to the back side of the radiator core vertically downward.
2. Apply water again to all radiator core surfaces once per minute.
3. Stop washing when clear water flows off the radiator.
4. Blow air into the back side of radiator core vertically downward.
q Use compressed air lower than 490 kPa (5 kg/cm2 , 71 psi) and keep distance more than 300 mm (11.8
in).

Revision: July 2005 CO-8 2005 Sentra
ENGINE COOLANT
[QG18DE]
5. Blow air again into all the radiator core surfaces once per minute until no water sprays out.
6. Check for leakage. A

CHECKING RADIATOR CAP
1. Inspect the radiator cap.
CO
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.
C
NOTE:
Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.
2. Pull the negative-pressure valve to open it and check that it D
closes completely when released.
q Check that there is no dirt or damage on the valve seat of the
radiator cap negative-pressure valve.
E
q Check that there are no abnormalities in the opening and
closing conditions of the negative-pressure valve.

SMA967B
G
3. Check radiator cap relief pressure using Tool.
Tool number : EG17650301 (J-33984-A) H

Standard: 78

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