2023 HYUNDAI SONATA climate control

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

Maintenance
8-30
Checking the Washer Fluid Level
ODN8089006
Check the fluid level in the washer fluid
reservoir and add fluid if necessary. Plain
water may be used if washer fluid is not
available. However, use washer solvent
with antifreeze characteristics in cold
climates to prevent freezing.
WARNING
To prevent serious injury or death, take
the following safety precautions when
using washer fluid: • Do not use engine coolant or
antifreeze in the washer fluid
reservoir.
Engine coolant can severely obscure
visibility when sprayed on the
windshield and may cause loss
of vehicle control resulting in an
accident or damage to paint and body trim.
• Do not allow sparks or flames to
contact the washer fluid or the
washer fluid reservoir. Washer fluid
may contain alcohol and can be flammable.
• Do not drink washer fluid and avoid
contact with skin. Washer fluid is
harmful to humans and animals.
• Keep washer fluid away from
children and animals.
waSHEr fLUiD

08
8-33
CLimatE ControL air fiLtEr
Filter Inspection
The climate control air filter should be
replaced according to the Maintenance
Schedule. If the vehicle is operated
in severely air-polluted cities or on
dusty rough roads for a long period, it
should be inspected more frequently
and replaced earlier. When you replace
the climate control air filter, replace it
performing the following procedure,
and be careful to avoid damaging other
components.
Filter Replacement
ODN8089010
1. Remove the support rod (1).
ODN8089011
2. Push in both sides of the glove box as shown. This will ensure that the glove
box stopper pins will get released
from its holding location allowing the
glove box to hang.
ODN8089012
3. Remove the climate control air filter case while pressing the lock on the
right side of the cover.
OIK077021
4. Replace the climate control air filter.
5. Reassemble in the reverse order of disassembly.
NOTICE
Install a new climate control air filter
in the correct direction with the arrow
symbol (↓) facing downwards, otherwise,
it may be noisy and the effectiveness of
the filter may be reduced.

08
8-37
Battery Recharging
WARNING
Always follow these instructions when
recharging your vehicle’s battery to
avoid the risk of SERIOUS INJURY or
DEATH from explosions or acid burns: • Before performing maintenance or
recharging the battery, turn off all
accessories and place the ignition
switch to the LOCK/OFF position.
• Keep all flames, sparks, or smoking
materials away from the battery.
• Always work outdoors or in an area
with plenty of ventilation.
• Wear eye protection when checking
the battery during charging.
• The battery must be removed from
the vehicle and placed in a well
ventilated area.
• Watch the battery during charging,
and stop or reduce the charging
rate if the battery cells begin boiling
violently.
• Vehicle is equipped with the
Absorbent Glass Mat (AGM) battery.
Do not charge the AGM battery with
a general charger. It may damage
or explode the AGM battery. Only
charge the AGM battery with a
charger that has AGM battery
setting.
• The negative battery cable must
be removed first to disconnect
the battery and installed last
to reconnect with the battery.
Disconnect the battery charger in the
following order:
1. Turn off the battery charger main
switch.
2. Unhook the negative clamp from the negative battery terminal.
3. Unhook the positive clamp from the positive battery terminal.
• Always use a genuine HYUNDAI
approved battery when you replace
the battery. By jump starting
After a jump start, idle the engine
with the headlights ON for 20-30
minutes before shutting the engine
off. The vehicle may not restart if you
shut it off before the battery had a
chance to adequately recharge. See
“Jump Starting” in chapter 7 for more
information on jump starting procedures.
Information
An inappropriately disposed battery can be harmful to
the environment and human health. Dispose of the battery
according to your local law(s) or
regulations.
Reset Features
The following items may need to be reset
after the battery has been discharged or
the battery has been disconnected. See
chapter 3 or 4 for: •
Power Windows
• Trip Computer
• Climate Control System
• Clock
• Audio System
• Sunroof

08
8-41
Tire Replacement
Tread wear indicatorTread wear indicator
OLMB073027
If the tire is worn evenly, a tread wear
indicator will appear as a solid band
across the tread. This shows there is
less than 1.6 mm (2/32 inch) of tread left
on the tire. Replace the tire when this happens.
Do not wait for the tread surface to
become level with the tread wear
indicators before replacing the tire.
WARNING
To reduce the risk of DEATH or SERIOUS
INJURY: • Replace tires that are worn, show
uneven wear, or are damaged.
Worn tires can cause loss of braking
effectiveness, steering control, and
traction.
• Always replace tires with the same
size as each tire that was originally
supplied with this vehicle. Using
tires and wheels other than the
recommended sizes could cause
unusual handling characteristics,
poor vehicle control, or negatively
affect your vehicle’s Anti-Lock Brake
System (ABS) resulting in a serious
accident. •
Tires degrade over time, even when
they are not being used. Regardless
of the remaining tread, HYUNDAI
recommends that tires be replaced
after six (6) years of normal service.
• When replacing tires, it is
recommended to replace the two
front or two rear tires as a pair.
Replacing just one tire can seriously
affect your vehicle’s handling. If
only replacing one pair of tires, it is
recommended to install the pair of
new tires on the rear axle.
• Heat caused by hot climates or
frequent high loading conditions can
accelerate the aging process. Failure
to follow this warning may cause
sudden tire failure, which could lead
to a loss of vehicle control resulting
in an accident.
Compact spare tire replacement
A compact spare tire has a shorter
tread life than a regular size tire.
Replace it when you can see the tread
wear indicator bars on the tire. The
replacement compact spare tire should
be the same size and design tire as the
one provided with your new vehicle
and should be mounted on the same
compact spare tire wheel. The compact
spare tire is not designed to be mounted
on a regular size wheel, and the compact
spare tire wheel is not designed for
mounting a regular size tire.
WARNING
The original tire should be repaired or
replaced as soon as possible to avoid
failure of the spare and loss of vehicle
control resulting in an accident. The
compact spare tire is for emergency
use only. Do not operate your vehicle
over 80 km/h (50 mph) when using the
compact spare tire.

Maintenance
8-44
5. Maximum permissible inflation
pressure
This number is the greatest amount
of air pressure that should be put in
the tire. Do not exceed the maximum
permissible inflation pressure. Refer to
the Tire and Loading Information label
for recommended inflation pressure.
6. Maximum load rating
This number indicates the maximum
load in kilograms and pounds that can be
carried by the tire. When replacing the
tires on the vehicle, always use a tire that
has the same load rating as the factory
installed tire.
7. Uniform tire quality grading
Quality grades can be found where
applicable on the tire sidewall between
tread shoulder and maximum section width.
For example:TREAD WEAR 200
TRACTION AA
TEMPERATURE A
Tread wear
The tread wear grade is a comparative
rating based on the wear rate of the tire
when tested under controlled conditions
on a specified government test course.
For example, a tire graded 150 would
wear one-and-a-half times (1½) as well
on the government course as a tire
graded 100.
The relative performance of tires depends upon the actual conditions
of their use, however, and may depart
significantly from the norm due to
variations in driving habits, service
practices and differences in road
characteristics and climate.
These grades are molded on the
sidewalls of passenger vehicle tires. The
tires available as standard or optional
equipment on your vehicle may vary with
respect to grade.
Traction AA, A, B & C
The traction grades, from highest to
lowest, are AA, A, B and C. Those grades
represent the tire’s ability to stop on wet
pavement as measured under controlled
conditions on specified government
test surfaces of asphalt and concrete.
A tire marked C may have poor traction
performance.

Index
I-2
A
Accessing Your Vehicle ......................................................................................... 5-4
Immobilizer System ........................................................................................ 5-14
Remote Key ....................................................................................................... 5-4
Smart Key .......................................................................................................... 5-7
Air Bag - Advanced Supplemental Restraint System ..........................................3-37
Additional Safety Precautions .......................................................................... 3-57
Air Bag Warning Labels ................................................................................... 3-57
How Does the Air Bag System Operate? .........................................................3-42
Occupant Classification System (OCS) ...........................................................3-47
SRS Care .......................................................................................................... 3-56
What to Expect After an Air Bag Inflates ........................................................3-46
Where Are the Air Bags? .................................................................................. 3-39
Why Didn’t My Air Bag Go Off in a Collision? ..............................................3-52
Air Cleaner........................................................................................................... 8-31
Filter Replacement ........................................................................................... 8-31
Air Conditioning System ..................................................................................... 2-13
Appearance Care .................................................................................................. 8-64
Exterior Care .................................................................................................... 8-64
Interior Care ..................................................................................................... 8-68
Automatic Climate Control System ................................................................... 5-114
Automatic Heating and Air Conditioning ......................................................5-115
Manual Temperature Control Mode ............................................................... 5-116
System Maintenance ...................................................................................... 5-123
System Operation ........................................................................................... 5-122
Automatic Transmission ...................................................................................... 6-13
Automatic Transmission Operation .................................................................. 6-13
Good Driving Practices ................................................................................... 6-18
LCD Display Message ..................................................................................... 6-17
Paddle Shifter (Manual Shift Mode) ............................................................... 6-19
Parking ............................................................................................................. 6-16

I
I-3
B
Basic Troubleshooting Guide .............................................................................. 7-20
Battery ................................................................................................................. 8-36
Battery Recharging ........................................................................................... 8-37
For Best Battery Service .................................................................................. 8-36
Reset Features .................................................................................................. 8-37
Before Driving ....................................................................................................... 6-5
Before Entering the Vehicle ............................................................................... 6-5
Before Starting ................................................................................................... 6-5
Blind View Monitor (BVM) ............................................................................. 6-104
Blind-Spot Collision Warning (BCW) /
Blind-Spot Collision-Avoidance Assist (BCA) ...................................................6-77
Detecting Sensors (Front View Camera and Rear Corner Radar) ....................6-82
Limitations of the System ................................................................................ 6-85
System Description .......................................................................................... 6-77
System Setting and Activation ......................................................................... 6-78
Warning and System Control ........................................................................... 6-80
Brake Fluid .......................................................................................................... 8-29
Checking the Brake Fluid Level ....................................................................... 8-29
Brake System ....................................................................................................... 6-30
Anti-Lock Brake System (ABS) ...................................................................... 6-37
Auto Hold ......................................................................................................... 6-34
Disc Brakes Wear Indicator .............................................................................. 6-30
Electronic Parking Brake (EPB) ...................................................................... 6-31
Electronic Stability Control (ESC) ................................................................... 6-39
Good Braking Practices .................................................................................... 6-42
Hill-Start Assist Control (HAC) ....................................................................... 6-42
Power Brakes .................................................................................................... 6-30
Vehicle Stability Management (VSM) .............................................................6-41
Bulb Wattage ........................................................................................................ 2-11
C Child Restraint System (CRS) ............................................................................. 3-29
Children Always in the Rear ............................................................................ 3-29
Installing a Child Restraint System (CRS) .......................................................3-31
Selecting a Child Restraint System (CRS) .......................................................3-30
Climate Control Additional Features ................................................................. 5-130
Automatic Ventilation .................................................................................... 5-130
Sunroof Inside Air Recirculation ................................................................... 5-130