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B ENGINE
A
ENGINE COOLING SYSTEM
SECTION CO CO
C
D
E
CONTENTS
PRECAUTIONS ......................................................... 2
. REMOVAL .......................................................... 17
. F
Precautions for Liquid Gasket ................................. 2 . INSPECTION AFTER REMOVAL ...................... 17 .
REMOVAL OF LIQUID GASKET SEALING ......... 2 . INSTALLATION .................................................. 17 .
LIQUID GASKET APPLICATION PROCEDURE 2 ..... INSPECTION AFTER INSTALLATION ............... 18 . G
PREPARATION .......................................................... 3
. Removal and Installation (Motor driven type) ........ 18 .
Special Service Tools .............................................. 3
. REMOVAL .......................................................... 18
.
Commercial Service Tools ....................................... 4 . INSTALLATION .................................................. 18 .
H
OVERHEATING CAUSE ANALYSIS ......................... 5 . WATER PUMP ......................................................... 19.
Troubleshooting Chart ............................................. 5
. Removal and Installation ....................................... 19 .
COOLING SYSTEM ................................................... 7 . REMOVAL .......................................................... 19
.
Cooling Circuit ......................................................... 7
. INSPECTION AFTER REMOVAL ...................... 21 . I
System Chart .......................................................... 8
. INSTALLATION .................................................. 21 .
ENGINE COOLANT ................................................... 9 . INSPECTION AFTER INSTALLATION ............... 22 .
System Check ......................................................... 9
. WATER INLET AND THERMOSTAT ASSEMBLY ... 24 J
CHECKING COOLING SYSTEM HOSES ........... 9 . Removal and Installation ....................................... 24 .
CHECKING RESERVOIR LEVEL ........................ 9 . REMOVAL .......................................................... 24
.
CHECKING COOLING SYSTEM FOR LEAKS ..... 9 INSPECTION AFTER REMOVAL ...................... 24 .
K
CHECKING RESERVOIR CAP .......................... 10 . INSTALLATION .................................................. 25 .
CHECKING RADIATOR ..................................... 10 . INSPECTION AFTER INSTALLATION ............... 25 .
Changing Engine Coolant ..................................... 10 . WATER OUTLET AND WATER PIPING .................. 26 .
DRAINING ENGINE COOLANT ........................ 10 . Removal and Installation ....................................... 26 . L
REFILLING ENGINE COOLANT ........................11 . REMOVAL .......................................................... 26
.
FLUSHING COOLING SYSTEM ........................ 13 . INSTALLATION .................................................. 26 .
RADIATOR ............................................................... 14
. INSPECTION AFTER INSTALLATION ............... 26 . M
Removal and Installation ....................................... 14 . SERVICE DATA AND SPECIFICATIONS (SDS) ..... 28 .
REMOVAL .......................................................... 14
. Standard and Limit ................................................. 28
.
INSTALLATION .................................................. 16. ENGINE COOLANT CAPACITY (APPROXI-
INSPECTION AFTER INSTALLATION .............. 16 . MATE) ................................................................. 28
.
ENGINE COOLING FAN ......................................... 17 . RADIATOR ......................................................... 28
.
Removal and Installation (Crankshaft driven type) 17 ... THERMOSTAT ................................................... 28 .
Revision: September 2006 CO-1 2007 Pathfinder
PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Liquid Gasket EBS00QCQ
REMOVAL OF LIQUID GASKET SEALING
G After removing nuts and bolts, separate the mating surface, using Tool and remove old liquid gasket seal-
ing.
Tool number : KV10111100 (J-37228)
CAUTION:
Be careful not to damage the mating surfaces.
G Tap Tool to insert it, and then slide it by tapping on the side as
shown.
G In areas where Tool is difficult to use, use plastic hammer to
lightly tap the parts, to remove it.
CAUTION:
If for some unavoidable reason suitable tool such as screw-
driver is used, be careful not to damage the mating sur- WBIA0566E
faces.
LIQUID GASKET APPLICATION PROCEDURE
1. Remove old liquid gasket adhering to the liquid gasket applica-
tion surface and the mating surface, Using scraper.
G Remove liquid gasket completely from the groove of the liquid
gasket application surface, bolts, and bolt holes.
2. Thoroughly clean the mating surfaces and remove adhering
moisture, grease and foreign materials.
PBIC0003E
3. Attach liquid gasket tube to Tool.
Tool number : WS39930000 ( -- )
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-47, "Recommended Chemical Products and Sealants" .
4. Apply liquid gasket without breaks to the specified location with
the specified dimensions.
G If there is a groove for the liquid gasket application, apply liq-
uid gasket to the groove.
WBIA0567E
G As for the bolt holes, normally apply liquid gasket inside the
holes. Occasionally, it should be applied outside the holes.
Make sure to read the text of service manual.
G Within five minutes of liquid gasket application, install the mat-
ing component.
G If liquid gasket protrudes, wipe it off immediately.
G Do not retighten nuts or bolts after the installation.
G After 30 minutes or more have passed from the installation, fill
engine oil and engine coolant.
CAUTION: SEM159F
If there are specific instructions in this manual, observe them.
Revision: September 2006 CO-2 2007 Pathfinder
PREPARATION
PREPARATION PFP:00002
A
Special Service Tools EBS00QCR
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
KV10111100 Removing chain tensioner cover and water E
(J-37228) pump cover
Seal cutter
F
NT046
G
WS39930000 Pressing the tube of liquid gasket
( -- )
Tube presser
H
S-NT052 I
KV991J0070 Filling cooling system
(J-45695)
Coolant refill tool J
K
LMA053
KV991J0010 Checking concentration of ethylene glycol in
(J-23688) engine coolant L
Engine coolant refractometer
M
WBIA0539E
Revision: September 2006 CO-3 2007 Pathfinder
PREPARATION
Commercial Service Tools EBS00QCS
Tool name Description
Power tool Loosening nuts and bolts
PBIC0190E
Radiator cap tester Checking radiator and radiator cap
PBIC1982E
Revision: September 2006 CO-4 2007 Pathfinder
OVERHEATING CAUSE ANALYSIS
OVERHEATING CAUSE ANALYSIS PFP:00012
A
Troubleshooting Chart EBS00QCT
Symptom Check items
Water pump malfunction Worn or loose drive belt CO
Thermostat stuck closed --
Poor heat transfer Dust contamination or --
Damaged fins C
paper clogging
Clogged radiator cooling Excess foreign material
tube (rust, dirt, sand, etc.)
D
Cooling fan does not oper-
ate
Reduced air flow High resistance to fan rota- Fan assembly --
tion E
Damaged fan blades
Damaged radiator shroud -- -- --
F
Improper engine coolant
-- -- --
mixture ratio
Cooling sys- Poor engine coolant quality -- Engine coolant viscosity --
tem parts G
malfunction Loose clamp
Cooling hose
Cracked hose
Heater pump Physical damage H
Water pump Poor sealing
Loose
Radiator cap I
Engine coolant leaks Poor sealing
Insufficient engine coolant O-ring for damage, deterio-
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
M
Revision: September 2006 CO-5 2007 Pathfinder
OVERHEATING CAUSE ANALYSIS
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
Blocked air flow
Installed large fog lamp
Revision: September 2006 CO-6 2007 Pathfinder
COOLING SYSTEM
COOLING SYSTEM PFP:21020
A
Cooling Circuit EBS00QCU
CO
C
D
E
F
G
H
I
WBIA0641E
1. Cylinder block (RH) 2. Oil cooler 3. Cylinder head (RH) J
4. Water pump 5. Radiator 6. Water inlet
7. Thermostat 8. Cylinder head (LH) 9. Heater pump
10. Cylinder block (LH) K
L
M
Revision: September 2006 CO-7 2007 Pathfinder
COOLING SYSTEM
System Chart EBS00QCV
WBIA0565E
Revision: September 2006 CO-8 2007 Pathfinder
ENGINE COOLANT
ENGINE COOLANT PFP:KQ100
A
System Check EBS00QCW
WARNING:
G Never remove the radiator/reservoir cap when the engine is hot. Serious burns could occur from CO
high pressure fluid escaping from the radiator.
G Wrap a thick cloth around the cap. Slowly push down and turn it a quarter turn to allow built-up
pressure to escape. Carefully remove the cap by pushing down and turning it all the way. C
CHECKING COOLING SYSTEM HOSES
Check hoses for the following:
G Improper attachment D
G Leaks
G Cracks
E
G Damage
G Loose connections
G Chafing F
G Deterioration
CHECKING RESERVOIR LEVEL
G Check if the reservoir tank coolant level is within MIN to MAX G
when the engine is cool.
G Adjust coolant level if it is too much or too little.
H
I
J
SMA412B
CHECKING COOLING SYSTEM FOR LEAKS
To check for leakage, apply pressure to the cooling system using K
Tool.
Tool number : EG17650301 (J-33984-A)
L
Testing pressure : 137 kPa (1.4 kg/cm2 , 20 psi)
WARNING:
Never remove the radiator/reservoir cap when the engine is hot. M
Serious burns could occur from high pressure coolant escap-
ing from the radiator.
CAUTION: WBIA0568E
Higher pressure than specified may cause radiator damage.
Revision: September 2006 CO-9 2007 Pathfinder
ENGINE COOLANT
CHECKING RESERVOIR CAP
1. Check reservoir cap relief pressure using Tool.
Tool number : EG17650301 (J-33984-A)
Standard: 78 ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo