cooling system INFINITI FX35 2008 Owner's Manual

CO-1
ENGINE
C
DE
F
G H
I
J
K L
M
SECTION CO
A
CO
N
O P
CONTENTS
ENGINE COOLING SYSTEM
VQ35DE
SERVICE INFORMATION .. ..........................
3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
Precaution for Liquid Gasket .....................................3
PREPARATION ...................................................5
Special Service Tool ........................................... ......5
Commercial Service Tool ..........................................5
OVERHEATING CAUSE ANALYSIS ..................7
Troubleshooting Chart ......................................... ......7
COOLING SYSTEM ....................................... .....9
Cooling Circuit ..................................................... ......9
System Chart ............................................................9
ENGINE COOLANT ...........................................10
Inspection ............................................................ ....10
Changing Engine Coolant .......................................10
RADIATOR .........................................................13
Component .......................................................... ....13
Removal and Installation .........................................13
Checking Radiator Cap ...........................................14
Checking Radiator ...................................................15
RADIATOR (ALUMINUM TYPE) ........................16
Component .......................................................... ....16
Disassembly and Assembly ....................................16
COOLING FAN ...................................................20
Component .......................................................... ....20
Removal and Installation .........................................20
Disassembly and Assembly ....................................20
WATER PUMP ...................................................22
Component .......................................................... ....22
Removal and Installation .........................................22
WATER INLET AND THERMOSTAT ASSEM-
BLY ....................................................................
27
Component .......................................................... ....27
Removal and Installation .........................................27
WATER OUTLET AND WATER PIPING ..........29
Component ..............................................................29
Removal and Installation .........................................29
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
31
Standard and Limit ..................................................31
VK45DE
SERVICE INFORMATION .. .........................
32
PRECAUTIONS .................................................32
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
32
PREPARATION .................................................33
Special Service Tool ................................................33
Commercial Service Tool ........................................33
OVERHEATING CAUSE ANALYSIS ................34
Troubleshooting Chart .............................................34
COOLING SYSTEM ..........................................36
Cooling Circuit .........................................................36
System Chart ...........................................................36
ENGINE COOLANT ..........................................37
Inspection ................................................................37
Changing Engine Coolant ........................................37
RADIATOR ....................................... .................40
Component .......................................................... ....40
Removal and Installation .........................................40
Checking Radiator Cap ...........................................42
Checking Radiator ...................................................43
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

OVERHEATING CAUSE ANALYSISCO-7
< SERVICE INFORMATION > [VQ35DE]
C
D
E
F
G H
I
J
K L
M A
CO
NP
O
OVERHEATING CAUSE ANALYSIS
Troubleshooting ChartINFOID:0000000001325842
Symptom Check items
Cooling sys-
tem parts
malfunction Poor heat transfer
Water pump malfunction Worn or loose drive belt
—
Thermostat stuck closed —
Damaged fins
Dust contamination or pa-
per clogging
Physical damage
Clogged radiator cooling
tube Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow Cooling fan does not oper-
ate
Fan assembly —
High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud — — —
Improper engine coolant
mixture ratio ———
Poor engine coolant quality — Engine coolant density —
Insufficient engine coolant Engine coolant leaks Cooling hose
Loose clamp
Cracked hose
Water pump Poor sealing
Radiator cap Loose
Poor sealing
Radiator O-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tank Exhaust gas leaks into cool-
ing systemCylinder head deterioration
Cylinder head gasket deteri-
oration
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

COOLING SYSTEMCO-9
< SERVICE INFORMATION > [VQ35DE]
C
D
E
F
G H
I
J
K L
M A
CO
NP
O
COOLING SYSTEM
Cooling CircuitINFOID:0000000001325843
System ChartINFOID:0000000001325844
PBIC2073E
PBIC0847E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

CO-10
< SERVICE INFORMATION >[VQ35DE]
ENGINE COOLANT
ENGINE COOLANT
InspectionINFOID:0000000001325845
LEVEL CHECK
 Check if the reservoir tank engine coolant level is within the “MIN”
to “MAX” when the engine is cool.
 Adjust the engine coolant level as necessary.
LEAK CHECK
 To check for leaks, apply pressure to the cooling system with the
radiator cap tester (commercial service tool) (A) and radiator cap
tester adapter (commercial service tool) (B).
WARNING:
Do not remove radiator cap when engine is hot. Serious burns
could occur from high-pressure engine coolant escaping from
radiator.
CAUTION:
Higher test pressure than speci fied may cause radiator damage.
NOTE:
In a case that engine coolant decreases, replenish radiator with engine coolant.
 If anything is found, repair or replace damaged parts.
Changing Engine CoolantINFOID:0000000001325846
WARNING:
 To avoid being scalded, do not change en gine coolant when the engine is hot.
 Wrap a thick cloth around radiator cap and carefully remove radiator cap. First, turn radiator cap a
quarter of a turn to release built-up pressu re. Then turn radiator cap all the way.
DRAINING ENGINE COOLANT
1. Remove front engine undercover with power tool.
2. Open radiator drain plug at the bottom of radiator, and then
remove radiator cap.
When draining all of engine cool ant in the system, open water drai n plugs on cylinder block. Refer
to EM-123, "
Disassembly and Assembly".
SMA412B
Testing pressure
: 157 kPa (1.6 kg/cm
2, 23 psi)
PBIC5121J
SBIA0444E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ENGINE COOLANTCO-11
< SERVICE INFORMATION > [VQ35DE]
C
D
E
F
G H
I
J
K L
M A
CO
NP
O
3. Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.
4. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling sys tem. Refer to "FLUSHING COOLING SYSTEM".
REFILLING ENGINE COOLANT
1. Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If water drain plugs on cylinder block are removed, close and tighten them. Refer to EM-123, "
Dis-
assembly and Assembly".
2. Make sure that each hose clamp has been firmly tightened.
3. Remove air relief plug on heater hose.
4. Fill radiator, and reservoir tank if removed, to specified level. Pour engine coolant through engine coolant filler neck
slowly of less than 2 (2-1/8 US qt, 1-3/4 lmp qt) a minute
to allow air in system to escape.
 Use Genuine NISSAN Long Li fe Antifreeze/Coolant or
equivalent mixed with water (dis tilled or demineralized).
Refer to MA-9, "
Fluids and Lubricants".
 When engine coolant overflows air relief hole on heater hose, install air relief plug with new O-ring.
5. Install radiator cap.
6. Warm up until opening thermostat. Standard for warm ing-up time is approximately 10 minutes at 3,000
rpm.
 Make sure thermostat opening condition by touching r adiator hose (lower) to see a flow of warm water.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
7. Stop the engine and cool down to less than approximately 50 °C (122 °F).
Radiator drain plug:
: 1.18 N·m (0.12 kg-m, 10 in-lb)
SBIA0445E
Engine coolant capacity
(With reservoir tank at “MAX” level): Approximately 8.6 (9-1/8 US qt, 7-5/8 lmp qt)
SMA182B
Reservoir tank engine coolant capacity
(At “MAX” level): 0.8 (7/8 US qt, 3/4 lmp qt)
Air relief plug: : 1.19 N·m (0.12 kg-m, 11 in-lb)
SMA412B
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

CO-12
< SERVICE INFORMATION >[VQ35DE]
ENGINE COOLANT
 Cool down using fan to reduce the time.
 If necessary, refill radiator up to filler neck with engine coolant.
8. Refill reservoir tank to “MAX” level line with engine coolant.
9. Repeat steps 4 through 7 two or more times with radiator cap installed until engine coolant level no longer drops.
10. Check cooling system for leaks with engine running.
11. Warm up the engine, and check for sound of engine coolant flow while running engine from idle up to 3,000 rpm with heater temperature controller set at several position between “COOL” and “WARM”.
 Sound may be noticeable at heater unit.
12. Repeat step 11 three times.
13. If sound is heard, bleed air from cooling system by repeating step 4 through 7 until engine coolant level no
longer drops.
FLUSHING COOLING SYSTEM
1. Install reservoir tank if removed, and radiator drain plug.
If water drain plugs on cylinder block are removed, close and tighten them. Refer to EM-123, "
Dis-
assembly and Assembly".
2. Remove air relief plug on heater hose.
3. Fill radiator with water until water spills from the ai r relief hole, then close air relief plug. Fill radiator and
reservoir tank with water and reinstall radiator cap.
4. Run the engine and warm it up to normal operating temperature.
5. Rev the engine two or three times under no-load.
6. Stop the engine and wait until it cools down.
7. Drain water from the system. Refer to "DRAINING ENGINE COOLANT".
8. Repeat steps 1 through 7 until clear water begins to drain from radiator. Radiator drain plug:
: 1.18 N·m (0.12 kg-m, 10 in-lb)
SBIA0445E
Air relief plug: : 1.19 N·m (0.12 kg-m, 11 in-lb)
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

CO-34
< SERVICE INFORMATION >[VK45DE]
OVERHEATING CAUSE ANALYSIS
OVERHEATING CAUSE ANALYSIS
Troubleshooting ChartINFOID:0000000001325866
Symptom Check items
Cooling sys-
tem parts
malfunction Poor heat transfer
Water pump malfunction Worn or loose drive belt
—
Thermostat and water con-
trol valve stuck closed
—
Damaged fins Dust contamination or pa-
per clogging
Physical damage
Clogged radiator cooling
tube Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow Cooling fan does not oper-
ate
Fan assembly —
High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud — — —
Improper engine coolant
mixture ratio ———
Poor engine coolant quality — Engine coolant density —
Insufficient engine coolant Engine coolant leaksCooling hose
Loose clamp
Cracked hose
Water pump Poor sealing
Radiator cap Loose
Poor sealing
Radiator O-ring for da
mage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tank Exhaust gas leaks into cool-
ing system Cylinder head deterioration
Cylinder head gasket deteri-
oration
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

CO-36
< SERVICE INFORMATION >[VK45DE]
COOLING SYSTEM
COOLING SYSTEM
Cooling CircuitINFOID:0000000001325867
System ChartINFOID:0000000001325868
PBIC4865E
PBIC4866E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ENGINE COOLANTCO-37
< SERVICE INFORMATION > [VK45DE]
C
D
E
F
G H
I
J
K L
M A
CO
NP
O
ENGINE COOLANT
InspectionINFOID:0000000001325869
LEVEL CHECK
 Check if the reservoir tank engine coolant level is within the “MIN”
to “MAX” when engine is cool.
 Adjust the engine coolant level as necessary.
LEAK CHECK
 To check for leaks, apply pressure to the cooling system with radi-
ator cap tester (commercial serv ice tool) and radiator cap tester
adapter (commercial service tool) (A).
WARNING:
Do not remove radiator cap when engine is hot. Serious burns
could occur from high-pressure engine coolant escaping from
thermostat housing.
CAUTION:
Higher testing pressure than specified may cause radiator
damage.
NOTE:
In a case engine coolant decreases, r eplenish radiator with engine coolant.
 If anything is found, repair or replace damaged parts.
Changing Engine CoolantINFOID:0000000001325870
WARNING:
 To avoid being scalded, do not change engine coolant when engine is hot.
 Wrap a thick cloth around radiator cap and carefully remove radiator cap. First, turn radiator cap a
quarter of a turn to release built-up pressu re. Then turn radiator cap all the way.
DRAINING ENGINE COOLANT
1. Remove front engine undercover with power tool.
2. Open radiator drain plug at the bottom of radiator, and then
remove radiator cap.
When draining all of engine coolant in the system , open water drain plugs on cylinder block. Refer
to EM-242, "
Disassembly and Assembly".
3. Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.
SMA412B
Testing pressure : 157 kPa (1.6 kg/cm2, 23 psi)
JPBIA0828ZZ
SBIA0444E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

CO-38
< SERVICE INFORMATION >[VK45DE]
ENGINE COOLANT
4. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to "FLUSHING COOLING SYSTEM".
REFILLING ENGINE COOLANT
1. Install reservoir tank, and radiator drain plug.
CAUTION:
Be sure to clean radiator drain plug and install with new O-ring.
If water drain plugs on cylinder block are removed, close and tighten them. Refer to EM-242, "
Dis-
assembly and Assembly".
2. Make sure that each hose clamp has been firmly tightened.
3. Remove air relief plug on heater hose.
4. Fill thermostat housing and reservoir tank to specified level. Refill engine coolant up to fill er neck of thermostat housing.
 Pour engine coolant through engine coolant filler neck slowly of less than 2 (2-1/8 US qt, 1-3/4
Imp qt) a minute to allo w air in system to escape.
 Use Genuine NISSAN Long Life Anti freeze/Coolant or equivalent mixed with water (distilled or
demineralized). Refer to MA-9, "
Fluids and Lubricants".
 When engine coolant overflows air relief hole on heater hose, install air relief plug.
5. Install radiator cap.
6. Warm up until opening thermostat. Standard for warming- up time is approximately 10 minutes at 3,000
rpm.
 Make sure thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
7. Stop engine and cool down to less than approximately 50 °C (122 °F).
 Cool down using a fan to reduce the time.
 If necessary, refill engine coolant up to filler neck of thermostat housing. Radiator drain plug:
: 1.19 N·m (0.12 kg-m, 11 in-lb)
PBIC1530E
Engine coolant capacity
(With reservoir tank at “MAX” level):Approx. 10.0 (10-5/8 US qt, 8-3/4 Imp qt)
Reservoir tank engine coolant capacity
(At “MAX” level):0.8 (7/8 US qt, 3/4 lmp qt)
SMA412B
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C