Infiniti QX4 (R50). Manual — part 499
Overheating Cause Analysis
NBLC0029
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
paper clogging
Mechanical damage
Clogged radiator cooling
tube
Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow
Cooling fan does not oper-
ate
—
—
High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud
—
—
—
Improper coolant mixture
ratio
—
—
—
Poor coolant quality
—
—
—
Insufficient coolant
Coolant leaks
Cooling hose
Loose clamp
Cracked hose
Water pump
Poor sealing
Radiator cap
Loose
Poor sealing
Radiator
O-ring for damage, dete-
rioration or improper fit-
ting
Cracked radiator tank
Cracked radiator core
Reservoir tank
Cracked reservoir tank
Overflowing reservoir tank
Exhaust gas leaks into
cooling system
Cylinder head deteriora-
tion
Cylinder head gasket
deterioration
ENGINE COOLING SYSTEM
Overheating Cause Analysis
LC-24
Symptom
Check items
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 malfunc-
tion
—
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
—
Installed large fog lamp
Service Data and Specifications (SDS)
THERMOSTAT
NBLC0030
Valve opening temperature
76.5°C (170°F)
Valve lift
More than 8.6 mm/90°C (0.339 in/194°F)
WATER CONTROL VALVE
NBLC0035
Valve opening temperature
95°C (203°F)
Valve lift
More than 8.0 mm/108°C (0.315 in/226°F)
RADIATOR
NBLC0031
Unit: kPa (kg/cm
2
, psi)
Cap relief pressure
Standard
78 - 98 (0.8 - 1.0, 11 - 14)
Limit
59 - 98 (0.6 - 1.0, 9 - 14)
Leakage test pressure
157 (1.6, 23)
GI
MA
EM
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
Overheating Cause Analysis (Cont’d)
LC-25
NOTES
MAINTENANCE
CONTENTS
PRECAUTIONS . . . . . . . . . . . . . . . ...2
Supplemental Restraint System (SRS)
. . . ...2
PREPARATION . . . . . . . . . . . . . . . ...3
Special Service Tool . . . . . . . . . . . . . 3
Commercial Service Tool. . . . . . . . . . . .3
GENERAL MAINTENANCE . . . . . . . . . . . 4
PERIODIC MAINTENANCE . . . . . . . . . . . 6
Schedule 1. . . . . . . . . . . . . . . . ...7
EMISSION CONTROL SYSTEM MAINTENANCE
. . .7
. . . . . . 8
Schedule 2. . . . . . . . . . . . . . . . ...9
EMISSION CONTROL SYSTEM MAINTENANCE
. . .9
. . . . . ..10
RECOMMENDED FLUIDS AND LUBRICANTS. . ... 11
Fluids and Lubricants . . . . . . . . . . . . 11
SAE Viscosity Number . . . . . . . . . . . ..12
. . . . . . . . . . ..12
. . . . . . . . . . . . . . . ...12
Anti-freeze Coolant Mixture Ratio . . . . . . . .12
ENGINE MAINTENANCE . . . . . . . . . . . ..13
Checking Drive Belts . . . . . . . . . . . . .13
Changing Engine Coolant. . . . . . . . . . ..14
. . . . . . . ..14
Checking Fuel Lines . . . . . . . . . . . . ..16
Changing Fuel Filter . . . . . . . . . . . . ..16
. . . . . . . . . . . ..16
. . . . . . . . . ...17
Changing Air Cleaner Filter . . . . . . . . . ...17
. . . . . . . . . . ...17
Changing Engine Oil. . . . . . . . . . . . ..18
Changing Oil Filter. . . . . . . . . . . . . .18
Changing Spark Plugs. . . . . . . . . . . ...19
Checking EVAP Vapor Lines . . . . . . . . . .20
CHASSIS AND BODY MAINTENANCE . . . . . ...21
Checking Exhaust System. . . . . . . . . . .21
Checking A/T Fluid . . . . . . . . . . . . . 21
Changing A/T Fluid . . . . . . . . . . . . . 21
Checking All-mode 4WD Transfer Fluid . . . . . 22
Changing All-mode 4WD Transfer Fluid. . . . . 22
Checking Propeller Shaft. . . . . . . . . . ...23
Greasing Propeller Shaft . . . . . . . . . . ...23
Checking Differential Gear Oil. . . . . . . . ...23
Changing Differential Gear Oil . . . . . . . . ..24
LIMITED-SLIP DIFFERENTIAL GEAR
. . . . . . 24
Balancing Wheels . . . . . . . . . . . . . ..24
Tire Rotation . . . . . . . . . . . . . . . ..24
Checking Brake Fluid Level and Leaks. . . . . .25
Checking Brake Lines and Cables . . . . . . . 25
Checking Disc Brake . . . . . . . . . . . . .25
. . . . . . . . . . . . . . . . ...25
. . . . . . . . . . . . . . . . .25
. . . . . . . . . . . . . . . . . . 25
Checking Drum Brake . . . . . . . . . . . ...26
. . . . . . . . . . . . ..26
. . . . . . . . . . . . . . . . . .26
. . . . . . . . . . . . . . . . . 26
TEMPORARY METHOD FOR CHECKING LINING
WEAR
. . . . . . . . . . . . . . . . . .26
Checking Steering Gear, Linkage and Transfer
Gear . . . . . . . . . . . . . . . . . . ...26
. . . . . . . . . . . . . 26
. . . . . . . . . . . ...26
. . . . . . . . ..26
Checking Power Steering Fluid and Lines . . . . 27
. . . . . . . . . . 27
. . . . . . . . . . . . ...27
Lubricating Locks, Hinges and Hood Latches. . ...27
Checking Seat Belts, Buckles, Retractors,
Anchors and Adjusters. . . . . . . . . . . ...28
SERVICE DATA AND SPECIFICATIONS (SDS) . . .29
Engine Maintenance . . . . . . . . . . . . ..29
. . . . . . . . . ..29
. . . . . . . . . . . 29
. . . . . . . . . . . . 29
Chassis and Body Maintenance. . . . . . . . 29
. . . . . . . . . . . . ...29
GI
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
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