2021 GENESIS G80 cooling

08
8 -7
If your temperature gauge indicates
overheating, you experience a loss of
power, or hear loud pinging or knocking,
the engine may be overheating. If this
happens, you should:
1. Pull off the road and stop as soon as it
is safe to do so.
2. Shift the gear to P (Park) and set the
parking brake. If the air conditioning is
ON, turn it OFF.
3. If engine coolant is running out under
the vehicle or steam is coming out
from the hood, stop the engine. Do
not open the hood until the coolant
has stopped running or the steaming
has stopped. If there is no visible
loss of engine coolant and no steam,
leave the engine running and check
to be sure the engine cooling fan is
operating. If the fan is not running,
turn the engine off.
WARNING
While the engine is running, keep hands, clothing and tools
away from the moving parts
such as the cooling fan and
drive belt to prevent serious
injury.
4. Check for coolant leaking from the
radiator, hoses or under the vehicle. (If
the air conditioning had been in use, it
is normal for cold water to be draining
from it when you stop.)
5. If engine coolant is leaking out, stop
the engine immediately and call the
nearest authorized retailer of Genesis
Branded products for assistance.
WARNING
Never remove the radiator cap, coolant cap or the drain plug
while the engine and radiator
are hot.Hot coolant and steam may blow out
under pressure, causing serious injury.
Turn the engine off and wait until the
engine cools down. Use extreme care
when removing the radiant cap or
coolant cap. Wrap a thick towel around
it, and turn it counterclockwise slowly
to the first stop. Step back while the
pressure is released from the cooling
system. When you are sure all the
pressure has been released, press down
on the cap, using a thick towel, and
continue turning counterclockwise to
remove it.
6. If you cannot find the cause of the
overheating, wait until the engine
temperature has returned to normal.
Then, if coolant has been lost,
carefully add coolant to the reservoir
to bring the fluid level in the reservoir
up to the halfway mark.
7. Proceed with caution, keeping alert
for further signs of overheating. If
overheating happens again, call an
authorized retailer of Genesis Branded
products for assistance.
CAUTION
• Serious loss of coolant indicates a
leak in the cooling system and should
be checked as soon as possible by
an authorized retailer of Genesis
Branded products.
• When the engine overheats from
low engine coolant, suddenly
adding engine coolant may cause
cracks in the engine. To prevent
damage, add engine coolant slowly
in small quantities. It may require
several refilling cycles to properly
fill the engine cooling system. If
necessary, an authorized retailer of
Genesis Branded products should be
consulted to perform this task.
IF THE ENGINE OVERHEATS

Maintenance
9-14
Engine Oil and Filter
The engine oil and filter should be
changed at the intervals specified in the
maintenance schedule. If the vehicle
is being driven in severe conditions,
more frequent oil and filter changes are
required.
Drive Belts
Inspect all drive belts for evidence
of cuts, cracks, excessive wear or oil
saturation and replace if necessary.
Drive belts should be checked
periodically for proper tension and
adjusted as necessary.
Information
When you are inspecting the belt, turn the
engine off.
Fuel Lines, Fuel Hoses and
Connections
Check the fuel lines, fuel hoses and
connections for leakage and damage.
Have an authorized retailer of Genesis
Branded products replace any damaged
or leaking parts immediately.
Fuel Filter
The fuel filter is considered to be
maintenance free but periodic inspection
is recommended for this maintenance
depends on fuel quality. If there are
some important matters like fuel flow
restriction, surging, loss of power, hard
starting problem etc., replace the fuel
filter immediately. We recommend that
you consult an authorized retailer of
Genesis Branded products for details.
Vapor Hose and Fuel Filler Cap
The vapor hose and fuel filler cap should
be inspected at those intervals specified
in the maintenance schedule. Make sure
a new vapor hose or fuel filler cap is
correctly replaced.
Air Cleaner Filter
We recommend that the air cleaner filter
be replaced by an authorized retailer of
Genesis Branded products.
Spark Plugs
Make sure to install new spark plugs of
the correct heat range.
Cooling System
Check cooling system components, such
as radiator, coolant reservoir, hoses and
connections for leakage and damage.
Replace any damaged parts.
EXPLANATION OF SCHEDULED MAINTENANCE ITEMS

Maintenance
9-18
ENGINE COOLANT/LIQUID-COOLED INTERCOOLER COOLANT
The high-pressure cooling system has a
reservoir filled with year-round antifreeze
coolant. The reservoir is filled at the
factory.
Check the antifreeze protection and
coolant level at least once a year, at
the beginning of the winter season and
before traveling to a colder climate.
Checking the Coolant Level
„„Engine coolant„Ǵ2.5L T-GDI
ORG3090010
„Ǵ3.5L T-GDI
ORG3090054
„„Liquid-cooled intercooler coolant„Ǵ2.5L T-GDI
ORG3090011
„Ǵ3.5L T-GDI
ORG3090055
Check the condition and connections
of all cooling system hoses and
heater hoses. Replace any swollen or
deteriorated hoses.
The coolant level should be filled
between the MAX and the MIN marks on
the side of the coolant reservoir when
the engine is cool.
If the coolant level is low, add enough
distilled (deionized) water to bring the
level to the MAX mark, but do not overfill.
If frequent additions are required, see an
authorized retailer of Genesis Branded
products for a cooling system inspection.

09
9-19
WARNING
Never remove the engine coolant radiator cap, coolant
cap or the drain plug while
the engine and radiator are
hot. Hot coolant and steam
may blow out under pressure,
causing serious injury.
Turn the vehicle off and wait until
the engine cools down. Use extreme
care when removing the radiator cap,
coolant cap. Wrap a thick towel around
it, and turn it counterclockwise slowly
to the first stop. Step back while the
pressure is released from the cooling
system. When you are sure all the
pressure has been released, press down
on the cap, using a thick towel, and
continue turning counterclockwise to
remove it.
Information
The coolant level is influenced by the
engine temperature. Before checking or
refilling the coolant, turn the engine off.
WARNING
The electric motor for the cooling fan may continue to
operate or start up when the
engine is not running and can
cause serious injury. Keep
hands, clothing and tools away
from the rotating fan blades of
the cooling fan.
Always turn off the vehicle unless the
vehicle has to be inspected with the
engine on. Be cautious as the cooling
fan may operate if the negative (-)
battery terminal is not disconnected.
WARNING
Make sure the coolant cap is properly
closed after refilling coolant. Otherwise
the engine could be overheated while
driving.
„„Engine compartment front view
OOSH089010L
1. Check if the coolant cap label is
straight in front.
OJX1099046
2. Make sure that the tiny protrusions
inside the coolant cap is securely
interlocked.

Maintenance
9-50
Engine compartment fuse panel
TypeFuse Name Fuse Rating Circuit Protected
MAIN A LT
225A
Alternator
MDPS1 125A
MDPS Unit
MULTI COOLING FAN
100A
Cooling Fan Motor
GLOW 100A
Not Used
IEB1 60A
IEB Unit
IEB2 60A
IEB Unit
OIL PUMP 50A
Electronic Oil Pump
IEB3 50A
IEB Unit
REAR HEATED 40A
Rear Heated Relay
E-CVVT1 40A
E-CVVT Relay
4WD 30A
4WD ECU
WIPER 30A
Wiper Motor
SB HEAD LAMP LH
30A
Head Lamp LH
START 30A
Start Relay
HEAD LAMP RH 30A
Head Lamp RH
MICRO A/C
15A
A/C Relay
HORN 15A
PCB Block(Horn Relay)
HTD IND 10A
Front A/C controller
E-CVVT2 20A
ECM
E-CVVT3 20A
ECM
MODULE1 10A
Not Used
FUEL PUMP 20A
Fuel Pump Relay
ECU1 15A
ECM
TCU1 20A
TCM

09
9-51
Engine compartment fuse panel
Fuse NameFuse Rating Circuit Protected
IG1 30A
IG1 Relay
ECU3 30A
Engine Control Realy
IG2 30A
IG2 Relay
ACC 30A
ACC Relay
ECU2 10A
ECM
EWP 20A
Electronic Water Pump
MODULE2 10A
Smart Cruise Control Radar, Front Radar LH/RH, 4WD ECU
SENSOR5 10A
Electronic Oil Pump
MDPS2 10A
MDPS Unit
IEB4 10A
IEB Unit
ACTIVE HOOD 10A
Active Hood Control Unit
TCU2 15A
P/N Relay, TCM
SENSOR3 10A[G4KR] Oxygen Sensor (Up/DOWN)
[G6DS] Oxygen Sensor #1~#2
SENSOR2 10A[G4KR] E/R Junction Block(A/C Relay), Oil Control Valve
(Exhaust), Oil Pump Solenoid Valve, Purge Control
Solenoid Valve
RCV Control Solenoid Valve, Canister Close Valve
[G6DS] E/R Junction Block(A/C Relay), RCV Control
Solenoid Valve #1~#2, Purge Control Solenoid Valve, Oil
Pump Solenoid Valve,
Oxygen Sensor #3~#4, Oil Control Valve #1~#4, Canister
Close Valve
SENSOR1 10AG4KR] Injector #1~#4, E/R Junction Block(Fuel Pump
Relay)
[G6DS] Injector #1~#6(MPI), E/R Junction Block(Fuel
Pump Relay)
IGN COIL 15A[G4KR] Ignition Coil #1~#4
[G6DS] Ignition Coil #1~#6
SENSOR4 15A
Cooling Fan Motor
ECU4 20A
ECM
WASHER 15A
Washer Relay