2023 HYUNDAI SONATA cooling

While Driving
6-44
To Active Launch Control
ODN8N050002L
5. Press the accelerator to the maximum and start to drive by taking your foot
off from the brake pedal within 4
seconds. The Launch Control will
operate and a message ‘Launch
Control Active” will appear.
6. To deactivate (end) Launch Control, release the accelerator pedal.
CAUTION
• If you press the brake pedal and
accelerator pedal simultaneously
and take your foot off from the
accelerator pedal, the Launch
Control system will be released.
• If you do not depart within 4 seconds
while pressing the brake pedal
and accelerator pedal, the Launch
Control function will be canceled.
• Launch Control is available again
after cooling down by driving the
vehicle for at least 2 minutes.
Launch Control Limitation
If you use the Launch Control system
when the oil temperature of the
transmission is over a certain standard, a
warning message will be displayed and
the function will not work. In this case,
you should drive your vehicle fully (over
60 km/h) to lower the oil temperature
of the transmission to use the Launch
Control system.

While Driving
6-154
Winter Precautions
Use high quality ethylene glycol
coolant
Your vehicle is delivered with high
quality ethylene glycol coolant in the
cooling system. It is the only type of
coolant that should be used because it
helps prevent corrosion in the cooling
system, lubricates the water pump and
prevents freezing. Be sure to replace or
replenish your coolant in accordance
with the maintenance schedule in
chapter 8. Before winter, have your
coolant tested to assure that its freezing
point is sufficient for the temperatures
anticipated during the winter.
Change to "winter weight" oil if necessary
In some climates it is recommended that
a lower viscosity "winter weight" oil be
used during cold weather. See chapter 8
for recommendations. If you aren't sure
what weight oil you should use, consult
an authorized HYUNDAI dealer.
Check battery and cables
Winter puts additional burdens on the
battery system. Visually inspect the
battery and cables as described in
chapter 8. The level of charge in your
battery can be checked by an authorized
HYUNDAI dealer or a service station.Check spark plugs and ignition
system
Inspect your spark plugs as described in
chapter 8 and replace them if necessary. Also check all ignition wiring and
components to be sure they are not
cracked, worn or damaged in any way.
Use approved window washer anti-
freeze in system
To keep the water in the window washer
system from freezing, add an approved
window washer anti-freeze solution in
accordance with instructions on the
container. Window washer anti-freeze is
available from an authorized HYUNDAI
dealer and most auto parts outlets. Do
not use engine coolant or other types
of antifreeze as these may damage the
paint finish.
Do not let your parking brake freeze
Under some conditions your parking
brake can freeze in the engaged position.
This is most likely to happen when
there is an accumulation of snow or
ice around or near the rear brakes or
if the brakes are wet. If there is a risk
the parking brake may freeze, apply
it only temporarily while you put the
gear selector lever in P and block the
rear wheels so the car cannot roll. Then
release the parking brake.

06
6-155
Do not let ice and snow accumulate
underneath
Under some conditions, snow and ice
can build up under the fenders and
interfere with the steering. When driving
in severe winter conditions where this
may happen, you should periodically
check underneath the car to be sure the
movement of the front wheels and the
steering components is not obstructed.
Don't place foreign objects
or materials in the engine
compartment
Placement of foreign object or materials
which prevent cooling of the engine, in
the engine compartment, may cause a
failure or combustion. The manufacturer
is not responsible for the damage caused
by such placement.
To keep locks from freezing
To keep the locks from freezing, squirt
an approved de-icer fluid or glycerine
into the key opening. If a lock is covered
with ice, squirt it with an approved de-
icing fluid to remove the ice. If the lock
is frozen internally, you may be able to
thaw it out by using a heated key. Handle
the heated key with care to avoid injury.

Emergency Situations
7-6
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. Place the shift button in 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 HYUNDAI dealer
for assistance.
If the engIne overheats

07
7-7
WARNING
Your vehicle is equipped
with a pressurized coolant
reserve tank. NEVER remove
the engine coolant reservoir
tank/radiator 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 engine coolant
reservoir tank/radiator cap. Wrap
a towel or thick rag around it, and
turn it counterclockwise slowly to
release some of the pressure from the
system. Step back while the pressure is
released.
When you are sure all the pressure has
been released, continue turning the cap
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 HYUNDAI dealer for
assistance.
NOTICE
• Serious loss of coolant indicates a
leak in the cooling system and we
recommend the system be checked
by an authorized HYUNDAI dealer.
• 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.
• If there is overheating, park your
vehicle in a safe place and do not
turn off the engine until the cooling
fan stops. The engine might get stuck
due to sudden increase of water
temperature.
• Turn off the engine if the cooling fan
does not rotate.

08
8-9
Maintenance Schedule (Smartstream G1.6 T-GDI) (CONT)R : Replace A : Add S : Service I : Inspect L : Lubricate r : RotateDESCRIPTIONKILOMETERS X 1000
8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160
MONTHS 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120Brake Inspection (front disc/
pads & calipers
and rear disc/pads & calipers/shoes,
includes tire rotation)
Brake Service (includes parking
brake
inspection and tire rotation) I S I S I S I S I S
Brake Lines, Hoses and Connections I I I I I I I I I I
Battery Condition I I I I I I I I I I Suspension Mounting Bolts I I I I I I I I I I Air Conditioning Refrigerant I I I I I I I I I ICooling System Hoses and Connections I I I I I I I I I I
Exhaust Pipe and Muffler I I I I I I I I I I
Air intake hose I I I I I I I I I I Climate Control Air Filter R R R R R R R R R R

08
8-13
Maintenance Schedule (Smartstream G2.5 GDI) (CONT)R : Replace A : Add S : Service I : Inspect L : Lubricate r : RotateDESCRIPTIONKILOMETERS X 1000
8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160
MONTHS 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120Brake Inspection (front disc/
pads & calipers
and rear disc/pads & calipers/shoes,
includes tire rotation)
Brake Service (includes parking
brake
inspection and tire rotation) I S I S I S I S I S
Brake Lines, Hoses and Connections I I I I I I I I I I
Battery Condition I I I I I I I I I I Suspension Mounting Bolts I I I I I I I I I I Air Conditioning Refrigerant I I I I I I I I I ICooling System Hoses and Connections I I I I I I I I I I
Exhaust Pipe and Muffler I I I I I I I I I I Air intake hose I I I I I I I I I I
Climate Control Air Filter R R R R R R R R R R

08
8-17
Maintenance Schedule (Smartstream G2.5 T-GDI) (CONT)R : Replace A : Add S : Service I : Inspect L : Lubricate r : RotateDESCRIPTIONKILOMETERS X 1000
8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160
MONTHS 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120Brake Inspection (front disc/
pads & calipers
and rear disc/pads & calipers/shoes,
includes tire rotation)
Brake Service (includes parking
brake
inspection and tire rotation) I S I S I S I S I S
Brake Lines, Hoses and Connections I I I I I I I I I I
Battery Condition I I I I I I I I I I Suspension Mounting Bolts I I I I I I I I I I Air Conditioning Refrigerant I I I I I I I I I ICooling System Hoses and Connections I I I I I I I I I I
Exhaust Pipe and Muffler I I I I I I I I I I Air intake hose I I I I I I I I I I
Climate Control Air Filter R R R R R R R R R R