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OVERHEATING CAUSE ANALYSIS CO-35
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Except cool-
ing system
parts mal-
function — Overload on engine
Abusive driving
High engine rpm under no
load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system mal-
function
—
Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flow Blocked bumper —
—
Blocked radiator grille
Installed car brassiere
Mud contamination or
paper clogging
Blocked radiator —
Blocked condenser Blocked air flow
Installed large fog lamp
Symptom Check items
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CO-36
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COOLING SYSTEM
Revision: 2006 July 2007 FX35/FX45
COOLING SYSTEMPFP:21020
Cooling CircuitNBS003KG
PBIC4865E
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COOLING SYSTEM CO-37
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System ChartNBS003KH
PBIC4866E
Page 1228 of 4366
![INFINITI FX35 2007 Service Manual CO-38
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ENGINE COOLANT
Revision: 2006 July 2007 FX35/FX45
ENGINE COOLANTPFP:KQ100
InspectionNBS003KI
LEVEL CHECK
Check if the reservoir tank engine coolant level is within the
“MIN” to INFINITI FX35 2007 Service Manual CO-38
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ENGINE COOLANT
Revision: 2006 July 2007 FX35/FX45
ENGINE COOLANTPFP:KQ100
InspectionNBS003KI
LEVEL CHECK
Check if the reservoir tank engine coolant level is within the
“MIN” to](/manual-img/42/57018/w960_57018-1227.png)
CO-38
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ENGINE COOLANT
Revision: 2006 July 2007 FX35/FX45
ENGINE COOLANTPFP:KQ100
InspectionNBS003KI
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
radiator cap tester (commercial service tool) and radiator cap
tester adapter (SST).
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, replenish radiator with engine coolant.
If anything is found, repair or replace damaged parts.
Changing Engine CoolantNBS003KJ
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 pressure. 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-249, "
DISASSEMBLY" .
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 system. Refer to CO-40, "
FLUSHING COOLING SYSTEM" .
SMA412B
Testing pressure : 157 kPa (1.6 kg/cm2 , 23 psi)
PBIC1528E
SBIA0444E
Page 1229 of 4366
![INFINITI FX35 2007 Service Manual ENGINE COOLANT CO-39
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REFILLING ENGINE COOLANT
1. Install reservoir tank, and radiator drain plug.
CAUTION:
Be sure INFINITI FX35 2007 Service Manual ENGINE COOLANT CO-39
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REFILLING ENGINE COOLANT
1. Install reservoir tank, and radiator drain plug.
CAUTION:
Be sure](/manual-img/42/57018/w960_57018-1228.png)
ENGINE COOLANT CO-39
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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-253,
"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 filler 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 allow air in system to escape.
Use Genuine Nissan Long Life Antifreeze/Coolant or equivalent mixed with water (distilled or
demineralized). Refer to MA-12, "
RECOMMENDED 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.
8. Refill reservoir tank to “MAX” level line with engine coolant. 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
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![INFINITI FX35 2007 Service Manual CO-40
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ENGINE COOLANT
Revision: 2006 July 2007 FX35/FX45
9. Repeat steps 4 through 7 two or more times with radiator cap installed until engine coolant level no longer
drops.
10. Check cooli INFINITI FX35 2007 Service Manual CO-40
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ENGINE COOLANT
Revision: 2006 July 2007 FX35/FX45
9. Repeat steps 4 through 7 two or more times with radiator cap installed until engine coolant level no longer
drops.
10. Check cooli](/manual-img/42/57018/w960_57018-1229.png)
CO-40
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ENGINE COOLANT
Revision: 2006 July 2007 FX35/FX45
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 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 steps 4 through 7 until engine coolant level no longer drops.
FLUSHING COOLING SYSTEM
1. Install reservoir tank, 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-253,
"ASSEMBLY" .
2. Remove air relief plug on heater hose.
3. Fill thermostat housing with water until water spills from the air relief hole, then close air relief plug. Fill thermostat housing 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 system. Refer to CO-38, "
DRAINING ENGINE COOLANT" .
8. Repeat steps 1 through 7 until clear water begins to drain from radiator. Radiator drain plug:
: 1.19 N·m (0.12 kg-m, 11 in-lb)
PBIC1530E
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![INFINITI FX35 2007 Service Manual RADIATOR CO-41
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RADIATORPFP:21400
ComponentsNBS005RW
Removal and InstallationNBS003KK
REMOVAL
WARNING:
Do not remove INFINITI FX35 2007 Service Manual RADIATOR CO-41
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RADIATORPFP:21400
ComponentsNBS005RW
Removal and InstallationNBS003KK
REMOVAL
WARNING:
Do not remove](/manual-img/42/57018/w960_57018-1230.png)
RADIATOR CO-41
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RADIATORPFP:21400
ComponentsNBS005RW
Removal and InstallationNBS003KK
REMOVAL
WARNING:
Do not remove radiator cap when engine is hot. Serious burns could occur from high-pressure engine
coolant escaping from radiator. Wrap a thick cloth around radiator cap. Slowly turn it a quarter of a
turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.
1. Remove engine cover with power tool. Refer to EM-173, "
ENGINE ROOM COVER" .
2. Remove engine front undercover with power tool.
3. Drain engine coolant from radiator. Refer to CO-38, "
Changing Engine Coolant" .
CAUTION:
Perform this step when engine is cold.
4. Remove air duct (inlet), air cleaner case and mass air flow sensor assembly. Refer to EM-177, "
AIR
CLEANER AND AIR DUCT" .
5. Remove radiator hoses (upper and lower). CAUTION:
Do not spill engine coolant on drive belts.
1. Radiator 2. Upper mount bracket 3. Mounting rubber
4. Radiator hose (lower) 5. Radiator drain plug 6. O-ring
7. A/T fluid cooler hose 8. Radiator hose (upper) 9. Reservoir tank hose
10. Reservoir tank cap 11. Reservoir tank 12. Radiator shroud (lower)
13. Radiator shroud
PBIC1531E
Page 1232 of 4366
CO-42
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RADIATOR
Revision: 2006 July 2007 FX35/FX45
6. Disconnect A/T fluid cooler hoses.
Install blind plug to avoid leakage of A/T fluid.
7. Remove radiator shroud (lower).
While pressing left and right pawls in direction indicated by
arrows, pull radiator shroud (lower) rearwards to remove.
8. Lift up and remove radiator shroud.
9. Remove washer tank mounting bolts.
10. Rotate two radiator upper mount brackets 90 degrees in the direction as shown in the figure, and remove them.
PBIC1532E
PBIC1535E
PBIC1534E
PBIC1533E