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B ENGINE
A
ENGINE COOLING SYSTEM
SECTION CO CO
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 2. ENGINE COOLING FAN .......................................... 13 . F
Precautions for Supplemental Restraint System Removal and Installation (Crankshaft Driven Type) 13 ...
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- REMOVAL .......................................................... 13
.
SIONER" ................................................................. 2
. INSPECTION AFTER REMOVAL ...................... 13 . G
PREPARATION .......................................................... 3
. INSTALLATION .................................................. 13 .
Special Service Tools .............................................. 3. INSPECTION AFTER INSTALLATION ............... 13 .
Commercial Service Tools ....................................... 3 . Removal and Installation (Motor Driven Type) ...... 14 .
H
OVERHEATING CAUSE ANALYSIS ......................... 4 . REMOVAL .......................................................... 14
.
Troubleshooting Chart ............................................. 4 . INSTALLATION .................................................. 14 .
COOLING SYSTEM ................................................... 6 . WATER PUMP ......................................................... 15.
Cooling Circuit ......................................................... 6
. Removal and Installation ....................................... 15 . I
System Drawing ...................................................... 7
. REMOVAL .......................................................... 15
.
ENGINE COOLANT ................................................... 8 . INSPECTION AFTER REMOVAL ...................... 15 .
Inspection ................................................................ 8
. INSTALLATION .................................................. 15 . J
LEVEL CHECK .................................................... 8 . INSPECTION AFTER INSTALLATION ............... 16 .
CHECKING COOLING SYSTEM FOR LEAKS ..... 8 THERMOSTAT AND WATER PIPING ..................... 17 .
CHECKING RESERVOIR CAP ............................ 8 . Removal and Installation ....................................... 17 .
K
CHECKING RADIATOR CAP ............................... 8 . REMOVAL .......................................................... 17
.
Changing Engine Coolant ....................................... 8 . INSPECTION AFTER REMOVAL ...................... 18 .
DRAINING ENGINE COOLANT .......................... 8 . INSTALLATION .................................................. 18 .
REFILLING ENGINE COOLANT ......................... 9 . INSPECTION AFTER INSTALLATION ............... 18 . L
FLUSHING COOLING SYSTEM .......................... 9 . SERVICE DATA AND SPECIFICATIONS (SDS) ..... 19 .
RADIATOR ............................................................... 10
. Standard and Limit ................................................. 19
.
Removal and Installation ....................................... 10 . ENGINE COOLANT CAPACITY (APPROXI- M
REMOVAL .......................................................... 10
. MATE) ................................................................. 19
.
INSTALLATION .................................................. 12 . THERMOSTAT ................................................... 19 .
INSPECTION AFTER INSTALLATION .............. 12 . RADIATOR ......................................................... 19
.
Checking Radiator ................................................. 12.
Revision: August 2007 CO-1 2004 QX56
PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EBS00I4Q
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
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
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:
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.
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.
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.
Revision: August 2007 CO-2 2004 QX56
PREPARATION
PREPARATION PFP:00002
A
Special Service Tools EBS00I4R
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number Description
CO
(Kent-Moore No.)
Tool name
EG17650301 Adapting radiator cap tester to radiator cap
(J-33984-A) and radiator filler neck C
Radiator cap tester adapter a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in) D
S-NT564
KV991J0010 Checking concentration of ethylene glycol in E
(J-23688) engine coolant
Engine coolant refractometer
F
WBIA0539E
G
Commercial Service Tools EBS00I4S
Tool name Description
H
Power tool Loosening bolts and nuts
I
PBIC0190E
J
Radiator cap tester Checking radiator and radiator cap
K
L
PBIC1982E
Coolant system tester adapter Adapting radiator cap tester to reservoir filler
neck M
WBIA0408E
Coolant system tester adapter Adapting radiator cap tester to reservoir cap
WBIA0409E
Revision: August 2007 CO-3 2004 QX56
OVERHEATING CAUSE ANALYSIS
OVERHEATING CAUSE ANALYSIS PFP:00012
Troubleshooting Chart EBS00I4T
Symptom Check items
Water pump malfunction Worn or loose drive belt
Thermostat stuck closed --
Dust contamination or
Damaged fins paper clogging
Poor heat transfer Physical damage --
Clogged radiator cooling Excess foreign material
tube (rust, dirt, sand, etc.)
Excess foreign material
Water cut valve malfunction (rust, dirt, sand, etc.), phys-
ical damage
Cooling fan does not oper-
ate
Reduced air flow High resistance to fan rota- Fan assembly --
tion
Damaged fan blades
Damaged radiator shroud -- -- --
Cooling sys-
tem parts Improper engine coolant
-- -- --
malfunction mixture ratio
Poor engine coolant quality -- Engine coolant density --
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: August 2007 CO-4 2004 QX56
OVERHEATING CAUSE ANALYSIS
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
Powertrain 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 car brassiere
Blocked radiator grille Mud contamination or F
Blocked or restricted air paper clogging --
flow
Blocked radiator --
Blocked condenser G
Blocked air flow
Installed large fog lamp
H
I
J
K
L
M
Revision: August 2007 CO-5 2004 QX56
COOLING SYSTEM
COOLING SYSTEM PFP:21020
Cooling Circuit EBS00I4U
WBIA0439E
Revision: August 2007 CO-6 2004 QX56
COOLING SYSTEM
System Drawing EBS00I4V
A
CO
C
D
E
F
G
H
I
WBIA0463E
J
K
L
M
Revision: August 2007 CO-7 2004 QX56
ENGINE COOLANT
ENGINE COOLANT PFP:KQ100
Inspection EBS00I4W
LEVEL CHECK
G Check if the engine coolant reservoir tank level is within MIN to
MAX level when engine is cool.
G Adjust engine coolant level as necessary.
SMA412B
CHECKING COOLING SYSTEM FOR LEAKS
WARNING:
Never remove the radiator or reservoir cap when the engine is hot. Serious burns could occur from
high-pressure engine coolant escaping from the radiator or reservoir.
G To check for leakage, apply pressure to the cooling system at
the reservoir filler neck using suitable tool and Tool.
Tool number : EG17650301 (J-33984-A)
Leakage test pressure : 137 kPa (1.4 kg/cm, 20 psi)
CAUTION:
Higher pressure than specified may cause radiator damage.
NOTE:
In case that engine coolant decreases, replenish cooling system
with engine coolant. WBIA0612E
G If any concerns are found, repair or replace damaged parts.
CHECKING RESERVOIR CAP
G Check reservoir cap relief pressure using suitable tool and Tool.
Tool number : EG17650301 (J-33984-A)
Standard : 95 - 125 kPa (0.97 - 1.28 kg/cm2 , 14 - 18
psi)
NOTE:
Apply engine coolant to the cap seal.
G Replace the reservoir cap if there is any damage in the nega-
tive-pressure valve, or if the open-valve pressure is outside of
the limit. WBIA0611E
CHECKING RADIATOR CAP
Inspect the radiator cap.
NOTE:
Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.
G Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket.
G Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or the
metal retainer.
Changing Engine Coolant EBS00I4X
Refer to MA-12, "Changing Engine Coolant" .
DRAINING ENGINE COOLANT
Refer to MA-12, "DRAINING ENGINE COOLANT" .
Revision: August 2007 CO-8 2004 QX56
ENGINE COOLANT
REFILLING ENGINE COOLANT
Refer to MA-13, "REFILLING ENGINE COOLANT" . A
FLUSHING COOLING SYSTEM
Refer to MA-14, "FLUSHING COOLING SYSTEM" . CO
C
D
E
F
G
H
I
J
K
L
M
Revision: August 2007 CO-9 2004 QX56
RADIATOR
RADIATOR PFP:21400
Removal and Installation EBS00I4Y
WBIA0519E
1. Radiator 2. Bolt 3. Mounting rubber
4. A/T fluid cooler hose 5. Radiator hose (lower) 6. Flaps
7. Radiator shroud (upper) 8. Radiator shroud (lower) 9. Drain plug
10. Radiator hose (upper) 11. Reservoir tank hose 12. By-pass hose
13. Reservoir tank 14. Reservoir tank cap
WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could occur from high-pressure
engine coolant escaping from the radiator.
REMOVAL
CAUTION:
Perform when the engine is cold.
1. Remove engine room cover. Refer to EM-11, "ENGINE ROOM COVER" .
2. Drain engine coolant from the radiator. Refer to MA-12, "DRAINING ENGINE COOLANT" .
3. Remove air cleaner and air duct assembly. Refer to EM-14, "REMOVAL" .
4. Disconnect A/T fluid cooler hoses.
G Install blind plug to avoid leakage of A/T fluid.
5. Disconnect radiator upper and lower hoses from radiator.
Revision: August 2007 CO-10 2004 QX56
RADIATOR
6. Remove the lower radiator shroud.
G Release the tabs, pull lower radiator shroud rearwards and A
down to remove.
CO
C
WBIA0407E
D
7. Remove the radiator shroud upper bolts and remove the radiator
shroud upper.
E
F
G
PBIC1535E
8. Remove the A/C condenser bolts and brackets. H
NOTE:
Lift A/C condenser up and forward to remove from radiator.
I
J
K
WBIA0395E
9. Remove A/T oil cooler bolts and oil cooler from radiator and
L
position aside.
M
WBIA0396E
Revision: August 2007 CO-11 2004 QX56
RADIATOR
10. Lift up and remove the radiator.
CAUTION:
Do not damage or scratch air conditioner condenser and
radiator core when removing.
PBIC1536E
INSTALLATION
Installation is in the reverse order of removal.
INSPECTION AFTER INSTALLATION
G Check for leaks of engine coolant. Refer to CO-8, "CHECKING COOLING SYSTEM FOR LEAKS" .
G Start and warm up the engine. Visually make sure that there are no leaks of the engine coolant.
Checking Radiator EBS00NKC
Check radiator for mud or clogging. If necessary, clean radiator as follows.
CAUTION:
G Be careful not to bend or damage the radiator fins.
G When radiator is cleaned without removal, remove all surrounding parts such as cooling fan, radi-
ator shroud and horns. Then tape the harness and electrical 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.
3. Stop washing when dirt and debris no longer flow out from the radiator.
4. Blow air into the back side of radiator core vertically downward.
G Use compressed air lower than 490 kPa (5 kg/cm2 , 71 psi) and keep distance more than 30 cm (11.8
in).
5. Blow air again into all the radiator core surfaces until no water sprays out.
Revision: August 2007 CO-12 2004 QX56
ENGINE COOLING FAN
ENGINE COOLING FAN PFP:21140
A
Removal and Installation (Crankshaft Driven Type) EBS00I51
CO
C
D
WBIA0632E
1. Cooling fan 2. Fan coupling 3. Fan bracket E
4. Cooling fan pulley
REMOVAL
F
1. Remove air duct. Refer to EM-14, "REMOVAL" .
2. Remove the engine front undercover using power tool.
3. Remove the lower radiator shroud. Refer to CO-10, "RADIATOR" . G
4. Remove cooling fan.
INSPECTION AFTER REMOVAL
Fan Coupling H
Inspect fan coupling for oil leakage and bimetal conditions.
I
J
K
SLC072
Fan Bracket L
G Visually check that there is no significant looseness in the fan
bracket shaft, and that it turns smoothly by hand.
G If there are any unusual concerns, replace the cooling fan pulley. M
WBIA0418E
INSTALLATION
Installation is in the reverse order of removal.
G Install cooling fan with its front mark "F" facing front of engine. Refer to CO-13, "Removal and Installation
(Crankshaft Driven Type)" .
INSPECTION AFTER INSTALLATION
G Check for leaks of the engine coolant. Refer to CO-8, "CHECKING COOLING SYSTEM FOR LEAKS" .
G Start and warm up the engine. Visually make sure that there are no leaks of the engine coolant.
Revision: August 2007 CO-13 2004 QX56
ENGINE COOLING FAN
Removal and Installation (Motor Driven Type) EBS00I52
REMOVAL
1. Remove front bumper. Refer to EI-13, "FRONT BUMPER" .
2. Disconnect harness connector from fan motor.
3. Remove fan grille and motor bolt and remove the fan grille and
motor assembly.
WBIA0518E
INSTALLATION
Installation is in the reverse order of removal.
G Cooling fan is controlled by ECM. For details, refer to EC-410, "Cooling Fan Operation" .
Revision: August 2007 CO-14 2004 QX56
WATER PUMP
WATER PUMP PFP:21020
A
Removal and Installation EBS00I53
CO
C
D
E
F
KBIA2543E
G
1. Gasket 2. Water pump 3. Water pump pulley
CAUTION: H
G When removing water pump, be careful not to get engine coolant on drive belt.
G Water pump cannot be disassembled and should be replaced as a unit.
I
REMOVAL
1. Drain engine coolant so that no engine coolant comes out from water pump fitting hole. Refer to MA-12,
"DRAINING ENGINE COOLANT" .
J
CAUTION:
Perform when the engine is cold.
2. Remove the engine front undercover using power tool.
K
3. Remove the air duct and resonator assembly. Refer to EM-14, "Removal and Installation" .
4. Remove the drive belt. Refer to EM-12, "Removal and Installation" .
5. Remove the water pump pulley. L
6. Remove the water pump.
G Engine coolant will leak from the cylinder block, so have a receptacle ready below.
CAUTION: M
Handle water pump vane so that it does not contact any other parts.
INSPECTION AFTER REMOVAL
G Visually check that there is no significant dirt or rusting on the
water pump body and vane.
G Make sure there is no looseness in the vane shaft, and that it
turns smoothly when rotated by hand.
G If there are any unusual concerns, replace the water pump
assembly.
KBIA2552E
INSTALLATION
Installation is in the reverse order of removal.
Revision: August 2007 CO-15 2004 QX56
WATER PUMP
G For bleeding the air from the cooling system, refer to MA-13, "REFILLING ENGINE COOLANT" .
INSPECTION AFTER INSTALLATION
G Check for leaks of engine coolant. Refer to CO-8, "CHECKING COOLING SYSTEM FOR LEAKS" .
G Start and warm up engine. Visually make sure that there are no leaks of engine coolant.
Revision: August 2007 CO-16 2004 QX56
THERMOSTAT AND WATER PIPING
THERMOSTAT AND WATER PIPING PFP:21200
A
Removal and Installation EBS00I54
CO
C
D
E
F
G
H
I
J
KBIA2501E
K
1. Heater pipe 2. Gasket 3. Water outlet
4. Gasket 5. O-ring 6. O-ring
7. Thermostat housing 8. Rubber ring 9. Thermostat L
10. Water inlet 11. Water suction hose 12. Water suction pipe
13. Gasket 14. Heater pipe
M
REMOVAL
Removal of Thermostat
1. Drain engine coolant from the radiator. Refer to MA-12, "DRAINING ENGINE COOLANT" .
CAUTION:
Perform when engine is cold.
2. Remove air duct and resonator assembly. Refer to EM-14, "REMOVAL" .
3. Remove engine room cover using power tools.
4. Disconnect water suction hose from water inlet.
5. Remove water inlet and thermostat.
Removal of Thermostat Housing, Water Outlet and Heater Pipe
1. Remove intake manifold. Refer to EM-15, "REMOVAL" .
2. Remove thermostat housing, water outlet and heater pipe.
Removal of Water Cut Valve
1. Drain engine coolant from the radiator. Refer to MA-12, "DRAINING ENGINE COOLANT" .
Revision: August 2007 CO-17 2004 QX56
THERMOSTAT AND WATER PIPING
CAUTION:
Perform when the engine is cold.
2. Remove air duct and resonator assembly. Refer to EM-14, "REMOVAL" .
3. Remove engine room cover using power tools.
4. Disconnect heater hose (heater core side).
5. Remove heater hose bracket.
6. Disconnect the water cut valve connector.
7. Remove the water cut valve
INSPECTION AFTER REMOVAL
G Place a thread so that it is caught in the valve of the thermostat.
Immerse fully in a container filled with water. Heat while stirring.
G The valve opening temperature is the temperature at which the
valve opens and falls from the thread.
G Continue heating. Check the full-open lift amount.
G After checking the full-open lift amount, lower the water temper-
ature and check the valve closing temperature.
SLC252B
Standard values:
Thermostat
Valve opening temperature 80 - 84◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo