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B ENGINE

ENGINE COOLING SYSTEM
SECTION CO CO

E
CONTENTS
QR25DE WATER PUMP ......................................................... 18 . F
Removal and Installation ....................................... 18 .
PRECAUTIONS ......................................................... 3
. REMOVAL .......................................................... 18.
Precautions for Supplemental Restraint System INSPECTION AFTER REMOVAL ...................... 18 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- INSTALLATION .................................................. 19 .
SIONER" ................................................................. 3
. INSPECTION AFTER INSTALLATION ............... 19 .
Precautions for Liquid Gasket ................................. 3 . THERMOSTAT AND THERMOSTAT HOUSING ..... 20 .
REMOVAL OF LIQUID GASKET ......................... 3 . H
Removal and Installation ....................................... 20 .
LIQUID GASKET APPLICATION PROCEDURE 3 ..... REMOVAL .......................................................... 20.
PREPARATION .......................................................... 5
. INSPECTION AFTER REMOVAL ...................... 21 .
Special Service Tools .............................................. 5
. INSTALLATION .................................................. 21 . I
Commercial Service Tools ....................................... 5 . WATER CONTROL VALVE ...................................... 22 .
PREPARATION FOR CHANGING ENGINE Removal and Installation ....................................... 22 .
COOLANT ............................................................ 6
. REMOVAL .......................................................... 22. J
OVERHEATING CAUSE ANALYSIS ......................... 7 . INSPECTION AFTER REMOVAL ...................... 23 .
Troubleshooting Chart ............................................. 7
. INSTALLATION .................................................. 23 .
COOLING SYSTEM ................................................... 9 . SERVICE DATA AND SPECIFICATIONS (SDS) ..... 24 .
Cooling Circuit ......................................................... 9
. K
Capacity ................................................................. 24
.
ENGINE COOLANT ................................................. 10 . Thermostat ............................................................ 24
.
System Check ....................................................... 10
. Water Control Valve ............................................... 24 .
CHECKING COOLING SYSTEM HOSES ......... 10 . Radiator ................................................................. 24
. L
CHECKING RESERVOIR LEVEL ...................... 10 .
CHECKING COOLING SYSTEM FOR LEAKS ... 10
CHECKING RADIATOR ..................................... 10 .
VQ35DE
M
CHECKING RADIATOR CAP ..............................11 . PRECAUTIONS ....................................................... 25.
Refilling Engine Coolant .........................................11. Precautions for Supplemental Restraint System
RADIATOR ............................................................... 12
. (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
Removal and Installation ....................................... 12 . SIONER" ................................................................ 25
.
REMOVAL .......................................................... 12
. Precautions for Liquid Gasket ............................... 25 .
INSTALLATION .................................................. 12. REMOVAL OF LIQUID GASKET SEALING ....... 25 .
Disassembly and Assembly .................................. 13 . LIQUID GASKET APPLICATION PROCEDURE 25 ...
PREPARATION ................................................. 13 . PREPARATION ........................................................ 27
.
DISASSEMBLY .................................................. 13 . Special Service Tools ............................................ 27.
ASSEMBLY ........................................................ 14
. Commercial Service Tools ..................................... 27 .
INSPECTION ..................................................... 16
. PREPARATION FOR CHANGING ENGINE
Disassembly and Assembly of Radiator Fan ........ 17 . COOLANT .......................................................... 28
.
DISASSEMBLY .................................................. 17 . OVERHEATING CAUSE ANALYSIS ....................... 29 .
ASSEMBLY ........................................................ 17
. Troubleshooting Chart ........................................... 29 .
COOLING SYSTEM ................................................. 31 .
Cooling Circuit ....................................................... 31
.

CO-1
ENGINE COOLANT ................................................. 32 . INSPECTION ......................................................39 .
System Check ....................................................... 32
. Disassembly and Assembly Radiator Fan .............39 .
CHECKING COOLING SYSTEM HOSES .......... 32 . DISASSEMBLY ...................................................39 .
CHECKING RESERVOIR LEVEL ...................... 32 . ASSEMBLY .........................................................40 .
CHECKING COOLING SYSTEM FOR LEAKS ... 32 WATER PUMP ..........................................................41 .
CHECKING RADIATOR ..................................... 32 . Removal and Installation ........................................41 .
CHECKING RADIATOR CAP ............................. 33 . REMOVAL ...........................................................41.
Refilling Engine Coolant ........................................ 33. INSPECTION AFTER REMOVAL .......................43 .
RADIATOR ............................................................... 34
. INSTALLATION ...................................................43 .
Removal and Installation ....................................... 34 . THERMOSTAT AND THERMOSTAT HOUSING ......45 .
REMOVAL .......................................................... 34
. Removal and Installation ........................................45 .
INSTALLATION ................................................... 34
. REMOVAL ...........................................................45.
CHECKING RADIATOR CAP ............................. 35 . INSPECTION AFTER REMOVAL .......................45 .
CHECKING RADIATOR ..................................... 35 . INSTALLATION ...................................................46 .
Disassembly and Assembly ................................... 35 . SERVICE DATA AND SPECIFICATIONS (SDS) .....47 .
PREPARATION .................................................. 36 . Capacity .................................................................47
.
DISASSEMBLY .................................................. 36 . Thermostat .............................................................47
.
ASSEMBLY ........................................................ 37
. Radiator .................................................................47
.

CO-2
PRECAUTIONS
[QR25DE]
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EBS007RB

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. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual. C
WARNING:
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. D
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. E
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 harness connec-
tors. F
Precautions for Liquid Gasket EBS00G4L

REMOVAL OF LIQUID GASKET
G
q After removing the mounting bolts and nuts, separate the mating
surface using a seal cutter and remove the sealant.
CAUTION:
Be careful not to damage the mating surfaces. H
q In areas where the cutter is difficult to use, use a plastic hammer
to lightly tap the areas where the sealant is applied.
CAUTION: I
If for some unavoidable reason a tool such as a flat-bladed
screwdriver is used, be careful not to damage the mating sur-
faces. J
PBIC0002E

LIQUID GASKET APPLICATION PROCEDURE
1. Using a scraper, remove the old sealant adhering to the mating K
surface.
q Remove the sealant completely from the groove, mounting
bolts, and bolt holes. L
2. Clean the mating surface thoroughly to remove adhering mois-
ture, grease and foreign materials.
3. Install the sealant tube into the tube presser. M
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-42, "Recommended Chemical Products and Sealants" .
PBIC0003E

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

EMA0622D

CO-3
PRECAUTIONS
[QR25DE]
q As for the bolt holes, normally apply the sealant inside the holes.
If specified, it should be applied outside the holes. Make sure to
read the instructions in this manual.
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 correct oil and coolant. Refer to GI-42, "Rec-
ommended Chemical Products and Sealants" . SEM159F
CAUTION:
If there are specific instructions in the service manual, observe them.

CO-4
PREPARATION
[QR25DE]
PREPARATION PFP:00002
A
Special Service Tools EBS007RD

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

S-NT052
E
EG17650301 Adapting radiator cap tester to radiator filler
(J33984-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
KV99103510 Installing radiator upper and lower tanks
( -- )
Radiator plate pliers A H

I
S-NT224

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

K
S-NT225

Commercial Service Tools EBS007RE L

Tool name Description
Power tool Loosening bolts and nuts
M

PBIC0190E

CO-5
PREPARATION
[QR25DE]
PREPARATION FOR CHANGING ENGINE COOLANT
Prepare an empty one gallon bottle, such as used for windshield
washer fluid. Obtain a 1,371mm (54 in) length of hose with the same
inner diameter as the coolant reservoir hose. Modify the one gallon
bottle by making a hole at the bottom slightly smaller than the hose
outer diameter to seal against leaks when the bottle is full of fluid.
q Insert the hose in the bottom of the bottle.
q Seal the hose to the bottle so it will not leak.

AMA139

CO-6
OVERHEATING CAUSE ANALYSIS
[QR25DE]
OVERHEATING CAUSE ANALYSIS PFP:00012
A
Troubleshooting Chart EBS00F18

Symptom Check items
Water pump malfunction Worn or loose drive belt CO
Thermostat stuck closed
Dust contamination or rock
C
Poor heat transfer Damaged fins 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- -- --
tion
Damaged fan blades
F
Damaged radiator shroud -- -- --
Improper coolant mixture
Cooling sys- -- -- --
ratio G
tem parts
malfunction Poor coolant quality -- Periodic maintenance --
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

CO-7
OVERHEATING CAUSE ANALYSIS
[QR25DE]
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
--
Installed large fog lamp

CO-8
COOLING SYSTEM
[QR25DE]
COOLING SYSTEM PFP:21020
A
Cooling Circuit EBS007RG

WBIA0065E

PBIC0280E

CO-9
ENGINE COOLANT
[QR25DE]
ENGINE COOLANT PFP:KQ100

System Check EBS00F1E

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 with a
tester.
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 of 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).

CO-10
ENGINE COOLANT
[QR25DE]
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
q To check radiator cap, apply pressure to cap with a tester. CO
Radiator cap relief
pressure
Standard C
: 78 - 98 kPa (0.8 - 1.0 kg/cm2 ,
11 - 14 psi)
Limit : 59 kPa (0.6 kg/cm2 , 14 psi) D

SLC755A
E

q Pull the negative pressure valve to open it.
q Check that it closes completely when released.
F

SMA967B

Refilling Engine Coolant EBS00F1C I
Changing the engine coolant is part of the required maintenance of the engine. Refer to MA-14, "Changing
Engine Coolant" .
J

CO-11
RADIATOR
[QR25DE]
RADIATOR PFP:21400

Removal and Installation EBS00F19

WBIA0146E

1. Radiator 2. Bracket 3. Mounting rubber
4. A/T oil cooler hose (if equipped) 5. Radiator hose (lower) 6. Radiator fan assembly
7. Reservoir tank 8. Radiator hose (upper) 9. Radiator filler cap

WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter turn to
allow built-up pressure to escape. Carefully remove the cap by turning it all the way.
REMOVAL
1. Drain coolant. Refer to MA-14, "Changing Engine Coolant" .
2. Remove air duct with air cleaner assembly.
3. Disconnect radiator upper hose, lower hoses and mounting bracket.
4. Disconnect the A/T oil cooler hoses, if equipped. Plug the hoses to prevent A/T oil loss.
5. Remove radiator and radiator fan assembly.
CAUTION:
q Do not damage or scratch the radiator core when removing.
INSTALLATION
q Installation is in the reverse order of removal.

CO-12
RADIATOR
[QR25DE]
Disassembly and Assembly EBS007RK

SLC882AB

PREPARATION G
1. Attach the spacer to the tip of the radiator plate pliers A.
Spacer specification: 1.5 mm (0.059 in) thick x 18 mm (0.71 in)
wide x 8.5 mm (0.335 in) long. H
2. Make sure that when radiator plate pliers A are closed dimen-
sion H is approx. 7.6 mm (0.299 in).
3. Adjust dimension H with the spacer, if necessary. I

J
SLC655C

DISASSEMBLY K
1. Remove tank with Tool.

SLC903

q Grip the crimped edge and bend it upwards so that Tool slips
off.
Do not bend excessively.

SLC893

CO-13
RADIATOR
[QR25DE]
q In areas where Tool cannot be used, use a screwdriver to
bend the edge up.
Be careful not to damage tank.

SLC930

2. Make sure the edge stands straight up.
3. Remove oil cooler from tank (A/T model only).

SLC931

ASSEMBLY
1. Install oil cooler into the tank (A/T model only).
Pay attention to direction of conical washer.

SLC894

2. Clean contact portion of tank.

SLC932

CO-14
RADIATOR
[QR25DE]
3. Install sealing rubber gasket.
Push it into the tank groove with your fingers. A
Be careful not to twist sealing rubber gasket.

SLC917A

D
4. Caulk tank in specified sequence with Tool.

G
SLC904

K
SLC896

q Use pliers in the locations where Tool cannot be used.
L

SLC897

CO-15
RADIATOR
[QR25DE]
5. Make sure that the rim is completely crimped down.
Standard height "H" : 8.0 - 8.4 mm (0.315 - 0.331 in)
6. Confirm that there is no leakage.
Refer to CO-16, "INSPECTION" .

SLC554A

INSPECTION
1. Apply pressure with Tool.
Specified pres- : 157 kPa (1.57 bar, 1.6 kg/cm2 ,
sure value 23 psi)
WARNING:
To prevent the risk of the hose coming undone while under
pressure, securely fasten it down with a hose clamp.
Attach a hose to the oil cooler as well (A/T model only).

SLC933

2. Check for leakage.

SLC934

CO-16
RADIATOR
[QR25DE]
Disassembly and Assembly of Radiator Fan EBS007RL

PBIC0238E I

1. Fan motors 2. Fan shroud 3. Fan blade

J
DISASSEMBLY
1. Remove fan blade.
2. Remove fan motors from fan shroud.
K
ASSEMBLY
Assembly is in the reverse order of disassembly.
L

CO-17
WATER PUMP
[QR25DE]
WATER PUMP PFP:21020

Removal and Installation EBS007RN

KBIA0154E

1. Water pump 2. Gasket 3. Water pump housing
4. Water pipe

WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
coolant escaping from the radiator.
REMOVAL
1. Drain coolant. Refer to MA-14, "Changing Engine Coolant" .
CAUTION:
Perform when the engine is cold.
2. Remove the following parts:
q Under cover, using power tools.

q Alternator, water pump and air compressor drive belt.

3. Remove the water pump.
NOTE:
If necessary, the alternator and exhaust manifold catalytic convertor assembly must be removed to
remove the water pipe.
CAUTION:
q Handle the water pump vane so that it does not contact any other parts.

q Water pump cannot be disassembled and should be replaced as an assembly.

INSPECTION AFTER REMOVAL
q Visually check that there is no significant dirt or rusting on the
water pump body and vane.
q Check that there is no looseness in the vane shaft, and that it
turns smoothly when rotated by hand.
q If the water pump does not perform properly, replace the water
pump assembly.

KBIA0155E

CO-18
WATER PUMP
[QR25DE]
INSTALLATION
q Installation is in the reverse order of removal. A

INSPECTION AFTER INSTALLATION
q After installing the water pump, check for leaks using the radiator cap tester. CO

CO-19
THERMOSTAT AND THERMOSTAT HOUSING
[QR25DE]
THERMOSTAT AND THERMOSTAT HOUSING PFP:21200

Removal and Installation EBS007RO

WBIA0010E

1. Thermostat 2. Engine coolant inlet 3. Engine coolant control valve
4. Engine coolant outlet 5. Heater hose 6. Engine coolant temperature sensor
7. Heater pipe 8. Throttle body inlet hose 9. Throttle body outlet hose

WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
coolant escaping from the radiator.
REMOVAL
CAUTION:
Perform when the engine is cold.
1. Drain engine coolant. Refer to MA-14, "Changing Engine Coolant" .
2. Remove radiator lower hose from the engine coolant inlet side.
3. Remove engine coolant inlet and thermostat.

CO-20
THERMOSTAT AND THERMOSTAT HOUSING
[QR25DE]
INSPECTION AFTER REMOVAL
q Place a thread so that it is caught in the valves of the thermostat. A
Immerse fully in a container filled with water. Heat while stirring.
q The valve opening temperature is the temperature at which the
valve opens and the falls from the thread. CO
q Continue heating. Check the full-open lift amount.
NOTE:
The full-open lift amount standard temperature for the thermo- C
stat is the reference value.
q After checking the full-open lift amount, lower the water temper-
ature and check the valve closing temperature. SLC252B
D
Thermostat Standard Values
Valve opening temperature 82

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