Infiniti Q45. Manual — part 278
OVERHEATING CAUSE ANALYSIS
CO-5
C
D
E
F
G
H
I
J
K
L
M
A
CO
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
CO-6
COOLING SYSTEM
COOLING SYSTEM
PFP:21020
Cooling Circuit
NBS001PL
SBIA0340E
COOLING SYSTEM
CO-7
C
D
E
F
G
H
I
J
K
L
M
A
CO
System Chart
NBS001PM
PBIC0160E
CO-8
ENGINE COOLANT
ENGINE COOLANT
PFP:KQ100
Inspection
NBS001PN
CHECKING ENGINE COOLANT LEVEL
●
Check if the reservoir tank engine coolant level is within “MIN” to
“MAX” when engine is cool.
●
Adjust engine coolant as necessary.
CHECKING COOLING SYSTEM FOR LEAKS
To check for leakage, apply pressure to the cooling system with
the radiator cap tester (commercial service tool) and the 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 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 Coolant
NBS001PO
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 grommet from engine undercover.
2.
Open radiator drain plug at the bottom of radiator, and remove radiator cap.
When draining all of engine coolant in the system, open water drain plugs on engine cylinder block.
Refer to
.
3.
Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to
CO-10, "FLUSHING COOLING SYSTEM"
4.
Remove reservoir tank as necessary, drain engine coolant and clean reservoir tank before installing.
SMA412B
Testing pressure
: 157 kPa (1.6 kg/cm
2
, 23 psi)
PBIC0953E
PBIC2775E
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