cooling INFINITI FX35 2004 Owner's Guide

REFRIGERANT LINES
ATC-159
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Revision: 2004 November 2004 FX35/FX45
CHECKING PROCEDURE
To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette
smoke in the vicinity of the vehicle. Perform the leak test in calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.
1. Turn engine OFF.
2. Connect a suitable A/C manifold gauge set to the A/C service ports.
3. Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm
2 , 50 psi) above 16°C (61°F). If less
than specification, recover/evacuate and recharge the system with the specified amount of refrigerant.
NOTE:
At temperatures below 16°C (61°F), leaks may not be detected since the system may not reach 345 kPa
(3.52 kg/cm
2 , 50 psi).
4. Perform the leak test from the high-pressure side (compressor discharge a to evaporator inlet h) to the
low-pressure side [evaporator drain hose i to shaft seal o (VK45DE) or n (VQ35DE)]. Refer to ATC-139,
"Components" . Perform a leak check for the following areas carefully. Clean the component to be
checked and move the leak detected probe completely around the connection/component.
Compressor
Check the fitting of high- and low-pressure hoses, relief valve and shaft seal.
Liquid tank
Check the refrigerant connection.
Service valves
Check all around the service valves. Ensure service valve caps are secured on the service valves (to pre-
vent leaks).
NOTE:
After removing A/C manifold gauge set from service valves, wipe any residue from valves to prevent any
false readings by leak detector.
Cooling unit (Evaporator)
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in the
cooling unit. Wait a minimum of 10 minutes accumulation time (refer to the manufacturer′s recommended
procedure for actual wait time) before inserting the leak detector probe into the drain hose.
Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water
or dirt that may be in the drain hose.
5. If a leak detector detects a leak, verify at least once by blowing compressed air into area of suspected
leak, then repeat check as outlined above.
6. Do not stop when one leak is found. Continue to check for additional leaks at all system components.
If no leaks are found, perform steps 7-10.
7. Start engine.
8. Set the heater A/C control as follows;
a. A/C switch: ON
b. Face mode
c. Intake position: Recirculation
d. Max cold temperature
e. Fan speed: High
9. Run engine at 1,500 rpm for at least 2 minutes.
10. Turn engine off and perform leak check again following steps 4 through 6 above.

RADIATOR CORE SUPPORT
BL-19
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Revision: 2004 November 2004 FX35/FX45
RADIATOR CORE SUPPORTPFP:62500
Removal and InstallationAIS004LL
REMOVAL
1. Remove the front fender protector. Refer to EI-25, "Removal and Installation" .
2. Remove the front bumper. Refer to EI-14, "
Removal and Installation" .
3. Remove the ICC. Refer to ACS-67, "
REMOVAL AND INSTALLATION" .
4. Remove the headlamp. Refer to LT- 3 6 , "
Removal and Installation" .
5. Remove the washer tank. Refer to WW-33, "
Removal and Installation of Washer Tank" .
6. Remove the resonator.
7. Remove the power steering oil cooler. Refer to PS-41, "
HYDRAULIC LINE" .
8. Remove the ambient sensor. Refer to AT C - 11 7 , "
Removal and Installation" .
9. Remove the crash zone sensor. Refer to SRS-45, "
Removal and Installation" .
10. Remove the horn connector, blower fan connector and harness clip.
11. Remove the hood lock and disconnect hood lock control cable. Refer to BL-16, "
Removal and Installation
of Hood Lock Control" .
12. Remove the reservoir tank.
13. Remove mounting blots and remove radiator core support. Remove mounting bolts with power tool.
14. After remove radiator core support, remove the horn, cooling fan.
1. Radiator core support assembly 2. Bolt 3. Bolt
4. Horn (High) 5. Air guide (RH) 6. Cooling fan
7. Air guide (LH) 8. Horn (Low)
PIIA6018E

CO-1
ENGINE COOLING SYSTEM
B ENGINE
CONTENTS
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SECTION CO
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Revision: 2004 November 2004 FX35/FX45
ENGINE COOLING SYSTEM
VQ35DE
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Liquid Gasket .................................. 3
REMOVAL OF LIQUID GASKET SEALING .......... 3
LIQUID GASKET APPLICATION PROCEDURE ..... 3
PREPARATION ........................................................... 5
Special Service Tools ............................................... 5
Commercial Service Tools ........................................ 6
OVERHEATING CAUSE ANALYSIS .......................... 7
Troubleshooting Chart .............................................. 7
COOLING SYSTEM .................................................... 9
Cooling Circuit .......................................................... 9
System Drawing ..................................................... 10
ENGINE COOLANT ...................................................11
Inspection ................................................................ 11
LEVEL CHECK .................................................... 11
CHECKING COOLING SYSTEM FOR LEAKS .... 11
Changing Engine Coolant ....................................... 11
DRAINING ENGINE COOLANT .......................... 11
REFILLING ENGINE COOLANT ........................ 12
FLUSHING COOLING SYSTEM ......................... 13
RADIATOR ................................................................ 14
Removal and Installation ........................................ 14
REMOVAL ........................................................... 14
INSTALLATION ................................................... 15
INSPECTION AFTER INSTALLATION ............... 15
Checking Radiator Cap .......................................... 15
Checking Radiator .................................................. 16
RADIATOR (ALUMINUM TYPE) .............................. 17
Disassembly and Assembly ................................... 17
PREPARATION ................................................... 17
DISASSEMBLY ................................................... 17
ASSEMBLY ......................................................... 18
INSPECTION ...................................................... 20
COOLING FAN ......................................................... 21
Removal and Installation ........................................ 21
REMOVAL ........................................................... 21INSTALLATION ................................................... 21
Disassembly and Assembly .................................... 21
DISASSEMBLY ................................................... 21
ASSEMBLY ......................................................... 21
WATER PUMP .......................................................... 22
Removal and Installation ........................................ 22
REMOVAL ........................................................... 22
INSPECTION AFTER REMOVAL ....................... 24
INSTALLATION ................................................... 24
INSPECTION AFTER INSTALLATION ................ 25
WATER INLET AND THERMOSTAT ASSEMBLY .... 26
Removal and Installation ........................................ 26
REMOVAL ........................................................... 26
INSPECTION AFTER REMOVAL ....................... 27
INSTALLATION ................................................... 27
INSPECTION AFTER INSTALLATION ................ 27
WATER OUTLET AND WATER PIPING ................... 28
Removal and Installation ........................................ 28
REMOVAL ........................................................... 28
INSTALLATION ................................................... 28
INSPECTION AFTER INSTALLATION ................ 28
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 29
Standard and Limit .................................................. 29
ENGINE COOLANT CAPACITY (APPROXI-
MATE) .................................................................. 29
THERMOSTAT .................................................... 29
RADIATOR .......................................................... 29
VK45DE
PRECAUTIONS ........................................................ 30
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ................................................................. 30
PREPARATION ......................................................... 31
Special Service Tools ............................................. 31
Commercial Service Tools ...................................... 31
OVERHEATING CAUSE ANALYSIS ........................ 32
Troubleshooting Chart ............................................ 32

CO-2Revision: 2004 November 2004 FX35/FX45 COOLING SYSTEM .................................................. 34
Cooling Circuit ........................................................ 34
System Drawing ..................................................... 35
ENGINE COOLANT .................................................. 36
Inspection ............................................................... 36
LEVEL CHECK .................................................... 36
LEAK CHECK ...................................................... 36
Changing Engine Coolant ....................................... 36
DRAINING ENGINE COOLANT .......................... 36
REFILLING ENGINE COOLANT ......................... 37
FLUSHING COOLING SYSTEM ......................... 38
RADIATOR ................................................................ 39
Removal and Installation ........................................ 39
REMOVAL ........................................................... 39
INSTALLATION .................................................... 41
INSPECTION AFTER INSTALLATION ................ 41
Checking Radiator Cap .......................................... 41
Checking Radiator .................................................. 41
RADIATOR (ALUMINUM TYPE) ............................... 43
Disassembly and Assembly .................................... 43
PREPARATION ................................................... 43
DISASSEMBLY ................................................... 43
ASSEMBLY ......................................................... 44
INSPECTION ....................................................... 46
COOLING FAN .......................................................... 47
Removal and Installation (Crankshaft Driven Type) ... 47
REMOVAL ........................................................... 47
INSPECTION AFTER REMOVAL ........................ 47INSTALLATION .................................................... 47
Removal and Installation (Motor Driven Type) ........ 48
REMOVAL ............................................................ 48
INSTALLATION .................................................... 48
Disassembly and Assembly (Motor Driven Type) ... 48
DISASSEMBLY .................................................... 48
INSPECTION AFTER DISASSEMBLY ................ 48
ASSEMBLY .......................................................... 48
WATER PUMP ........................................................... 49
Removal and Installation ......................................... 49
REMOVAL ............................................................ 49
INSPECTION AFTER REMOVAL ........................ 49
INSTALLATION .................................................... 50
INSPECTION AFTER INSTALLATION ................ 50
THERMOSTAT AND WATER CONTROL VALVE ..... 51
Removal and Installation ......................................... 51
REMOVAL ............................................................ 51
INSPECTION AFTER REMOVAL ........................ 52
INSTALLATION .................................................... 52
INSPECTION AFTER INSTALLATION ................ 53
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 54
Standard and Limit .................................................. 54
ENGINE COOLANT CAPACITY (APPROXI-
MATE) .................................................................. 54
RADIATOR ........................................................... 54
THERMOSTAT ..................................................... 54
WATER CONTROL VALVE .................................. 54

OVERHEATING CAUSE ANALYSIS
CO-7
[VQ35DE]
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Revision: 2004 November 2004 FX35/FX45
OVERHEATING CAUSE ANALYSISPFP:00012
Troubleshooting ChartABS004UZ
Symptom Check items
Cooling sys-
tem parts
malfunctionPoor heat transferWater pump malfunction Worn or loose drive belt
— Thermostat stuck closed —
Damaged finsDust contamination or
paper clogging
Physical damage
Clogged radiator cooling
tubeExcess foreign material
(rust, dirt, sand, etc.)
Reduced air flowCooling 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 coolantEngine coolant leaksCooling hoseLoose clamp
Cracked hose
Water pump Poor sealing
Radiator capLoose
Poor sealing
RadiatorO-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tankExhaust gas leaks into
cooling systemCylinder head deterioration
Cylinder head gasket dete-
rioration

COOLING SYSTEM
CO-9
[VQ35DE]
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Revision: 2004 November 2004 FX35/FX45
COOLING SYSTEMPFP:21020
Cooling CircuitABS004T7
PBIC2073E

CO-10
[VQ35DE]
COOLING SYSTEM
Revision: 2004 November 2004 FX35/FX45
System DrawingABS004VY
PBIC0847E

ENGINE COOLANT
CO-11
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Revision: 2004 November 2004 FX35/FX45
ENGINE COOLANTPFP:KQ100
InspectionABS004T8
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.
CHECKING COOLING SYSTEM FOR LEAKS

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 radiator.
CAUTION:
Higher test pressure than specified 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 CoolantABS004T9
WARNING:

To avoid being scalded, never change engine coolant when engine is hot.

Wrap a thick cloth around cap and carefully remove cap. First, turn cap a quarter of a turn to
release built-up pressure. Then turn 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 remove
radiator cap.
CAUTION:
Be careful not to allow engine coolant to contact drive belts.
When drain all of engine coolant in the system, open water drain plugs on cylinder block. Refer to
EM-121, "
DISASSEMBLY" .
3. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
SMA412B
Testing pressure
: 157 kPa (1.6 kg/cm
2 , 23 psi)
SLC756A
SBIA0444E

CO-12
[VQ35DE]
ENGINE COOLANT
Revision: 2004 November 2004 FX35/FX45
If contaminated, flush the engine cooling system. Refer to CO-13, "FLUSHING COOLING SYSTEM" .
4. Remove reservoir tank, drain engine coolant and clean reservoir tank before installing.
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 are removed, close and tighten them. Refer to EM-126, "
ASSEMBLY" .
2. Remove air relief plug on heater hose.
3. Fill radiator and reservoir tank to specified level.

Use Genuine Nissan Long Life Antifreeze/ Coolant or
equivalent mixed with water (distilled or demineralized).
Refer to MA-12, "
RECOMMENDED FLUIDS AND LUBRI-
CANTS".

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.

When engine coolant overflows air relief hole on heater hose,
install air relief plug with new O-ring.
4. Warm up engine to normal operating temperature with radiator cap installed.
5. Run engine at 3,000 rpm for 10 seconds and return to idle speed.

Repeat two or three times.
CAUTION:
Watch engine coolant temperature gauge so as not to overheat engine.
6. 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 radiator up to filler neck with engine coolant.
7. Refill reservoir tank to “MAX” level line with engine coolant.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, 10 ft-lb)
SMA412B

ENGINE COOLANT
CO-13
[VQ35DE]
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Revision: 2004 November 2004 FX35/FX45
8. Repeat steps 3 through 6 two or more times with radiator cap installed until engine coolant level no longer
drops.
9. Check cooling system for leaks with engine running.
10. 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.
11. Repeat step 10 three times.
12. If sound is heard, bleed air from cooling system by repeating step 3 through 6 until engine coolant level no
longer drops.

Clean excess engine coolant from engine.
FLUSHING COOLING SYSTEM
1. Fill radiator with water until water spills from the air relief hole, then close air relief plug. Fill radiator and
reservoir tank with water and reinstall radiator cap.
2. Run engine and warm it up to normal operating temperature.
3. Rev engine two or three times under no-load.
4. Stop engine and wait until it cools down.
5. Drain water from the system. Refer to CO-11, "
DRAINING ENGINE COOLANT" .
6. Repeat steps 1 through 5 until clear water begins to drain from radiator.