Infiniti Q45. Manual — part 277
CO-1
ENGINE COOLING SYSTEM
B ENGINE
CONTENTS
C
D
E
F
G
H
I
J
K
L
M
SECTION
CO
A
CO
ENGINE COOLING SYSTEM
PRECAUTIONS . . . . . . . . . . . . . . .. 2
PREPARATION . . . . . . . . . . . . . . ... 3
Special Service Tools . . . . . . . . . . . ... 3
Commercial Service Tools . . . . . . . . . . 3
OVERHEATING CAUSE ANALYSIS . . . . . . .. 4
Troubleshooting Chart . . . . . . . . . . . .. 4
COOLING SYSTEM . . . . . . . . . . . . . 6
Cooling Circuit . . . . . . . . . . . . . . .. 6
System Chart . . . . . . . . . . . . . . ... 7
ENGINE COOLANT . . . . . . . . . . . . . 8
Inspection . . . . . . . . . . . . . . . . . 8
CHECKING ENGINE COOLANT LEVEL . . . .. 8
CHECKING COOLING SYSTEM FOR LEAKS . . 8
Changing Engine Coolant . . . . . . . . . . 8
RADIATOR . . . . . . . . . . . . . . . . .11
Removal and Installation . . . . . . . . . . .11
RADIATOR (ALUMINUM TYPE) . . . . . . . .. 14
Disassembly and Assembly . . . . . . . . ... 14
COOLING FAN . . . . . . . . . . . . . . .. 18
Removal and Installation . . . . . . . . . . 18
REMOVAL . . . . . . . . . . . . . . ... 18
INSTALLATION . . . . . . . . . . . . ... 18
Disassembly and Assembly . . . . . . . . . 19
WATER PUMP . . . . . . . . . . . . . . .. 20
Removal and Installation . . . . . . . . . . 20
THERMOSTAT AND WATER CONTROL VALVE . 22
Removal and Installation . . . . . . . . . . 22
SERVICE DATA AND SPECIFICATIONS (SDS) . .. 25
CO-2
PRECAUTIONS
PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
NBS001PH
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
●
To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
●
Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
●
Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
PREPARATION
CO-3
C
D
E
F
G
H
I
J
K
L
M
A
CO
PREPARATION
PFP:00002
Special Service Tools
NBS001PI
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service Tools
NBS001PJ
Tool number
(Kent-Moore No.)
Tool name
Description
EG17650301
(J33984-A)
Radiator cap tester adapter
Adapting radiator cap tester to radiator cap
and thermostat housing neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)
KV99103510
( – )
Radiator plate pliers A
Installing radiator upper and lower tanks
KV99103520
( – )
Radiator plate pliers B
Removing radiator upper and lower tanks
S-NT564
S-NT224
S-NT225
Tool name
Description
Power tool
Loosening bolts and nuts
Radiator cap tester
Checking radiator and radiator cap
PBIC0190E
PBIC1982E
CO-4
OVERHEATING CAUSE ANALYSIS
OVERHEATING CAUSE ANALYSIS
PFP:00012
Troubleshooting Chart
NBS001PK
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
paper 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
cooling system
Cylinder head deterioration
Cylinder head gasket dete-
rioration
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