2023 HYUNDAI SONATA air filter

Convenience Features
5-112
Air conditioning system operation tips
• If the vehicle has been parked in
direct sunlight during hot weather,
open the windows for a short time
to let the hot air inside the vehicle escape.
• After sufficient cooling has been
achieved, switch back from the
recirculated air to the fresh outside air position.
• To help reduce moisture inside of
the windows on rainy or humid
days, decrease the humidity inside
the vehicle by operating the air
conditioning system with the windows
and sunroof closed.
• Use the air conditioning system
every month only for a few minutes
to ensure maximum system
performance.
• If you operate air conditioner
excessively, the difference between
the temperature of the outside air and
that of the windshield could cause
the outer surface of the windshield
to fog up, causing loss of visibility. In
this case, set the mode selection knob
or button to the
position and fan
speed control to the lower speed.
System Maintenance
Cabin air filter
OIK047401L
[A] : Outside air, [B] : Recirculated air
[C] : Cabin air filter, [D] : Blower
[E] : Evaporator core, [F] : Heater core
The cabin air filter is installed behind
the glove box. It filters the dust or other
pollutants that enter the vehicle through
the heating and air conditioning system.
Have the cabin air filter replaced by an
authorized HYUNDAI dealer according to
the maintenance schedule. If the vehicle
is being driven in severe conditions such
as dusty or rough roads, more frequent
cabin air filter inspections and changes
are required.
If the air flow rate suddenly decreases,
the system should be checked at an
authorized HYUNDAI dealer.
Checking the amount of air
conditioner refrigerant and
compressor lubricant
When the amount of refrigerant is low,
the performance of the air conditioning
is reduced. Overfilling also reduces the
performance of the air conditioning
system.
Therefore, if abnormal operation is
found, have the system inspected by an
authorized HYUNDAI dealer.

05
5-123
Air conditioning system operation tips
• If the vehicle has been parked in
direct sunlight during hot weather,
open the windows for a short time
to let the hot air inside the vehicle escape.
• After sufficient cooling has been
achieved, switch back from the
recirculated air to the fresh outside air position.
• To help reduce moisture inside of
the windows on rainy or humid
days, decrease the humidity inside
the vehicle by operating the air
conditioning system with the windows
and sunroof closed.
• Use the air conditioning system
every month only for a few minutes
to ensure maximum system
performance.
• If you operate air conditioner
excessively, the difference between
the temperature of the outside air and
that of the windshield could cause
the outer surface of the windshield
to fog up, causing loss of visibility. In
this case, set the mode selection knob
or button to the
position and fan
speed control to the lower speed.
System Maintenance
Cabin air filter
OIK047401L
[A] : Outside air, [B] : Recirculated air
[C] : Cabin air filter, [D] : Blower
[E] : Evaporator core, [F] : Heater core
The cabin air filter is installed behind
the glove box. It filters the dust or other
pollutants that enter the vehicle through
the heating and air conditioning system.
Have the cabin air filter replaced by an
authorized HYUNDAI dealer according to
the maintenance schedule. If the vehicle
is being driven in severe conditions such
as dusty or rough roads, more frequent
cabin air filter inspections and changes
are required.
If the air flow rate suddenly decreases,
the system should be checked at an
authorized HYUNDAI dealer.

Engine Compartment .................................................................................... 8-3
Maintenance Services ................................................................................... 8-5
Owner’s Responsibility ............................................................................................ 8-5
Owner Maintenance Precautions ............................................................................ 8-5
Owner Maintenance ...................................................................................... 8-6
Owner Maintenance Schedule ................................................................................ 8-6
Scheduled Maintenance Services ................................................................ 8-8
Maintenance Schedule (Smartstream G1.6 T-GDI) ................................................8-8
Maintenance Schedule (Smartstream G2.5 GDI) ..................................................8-12
Maintenance Schedule (Smartstream G2.5 T-GDI) ...............................................8-16
Explanation of Scheduled Maintenance Items ..........................................8-20
Engine Oil ..................................................................................................... 8-23
Checking the Engine Oil Level ............................................................................... 8-23
Checking the Engine Oil and Filter ....................................................................... 8-25
Engine Coolant ............................................................................................. 8-26
Checking the Engine Coolant Level ...................................................................... 8-26
Changing Engine Coolant ...................................................................................... 8-28
Brake Fluid .................................................................................................... 8-29
Checking the Brake Fluid Level ............................................................................. 8-29
Washer Fluid ................................................................................................. 8-30
Checking the Washer Fluid Level .......................................................................... 8-30
Air Cleaner ..................................................................................................... 8-31
Filter Replacement .................................................................................................. 8-31
Climate Control Air Filter ............................................................................. 8-33
Filter Inspection...................................................................................................... 8-33
Filter Replacement ................................................................................................. 8-33
Wiper Blades ................................................................................................ 8-34
Blade Inspection .................................................................................................... 8-34
Blade Replacement ................................................................................................ 8-34
Battery .......................................................................................................... 8-36
For Best Battery Service ........................................................................................ 8-36
Battery Recharging ................................................................................................ 8-37
Reset Features ........................................................................................................ 8-37
8. Maintenance
8

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

Maintenance
8-10
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 120Fuel Tank, Fuel Filler Cap,
Canister, Vapor Hose I I I I I
Fuel Tank Air Filter I I I I I
Fuel Filter I I I I I
Fuel Lines, Hoses and Connections I I I I I
Air Cleaner Filter I R I R I R I R I R Brake fluid I I R I I R I I R ISpark plugs Replace every 72,000 km
Engine Coolant First, replace 192,000 km or 120 months.
After that, replace every 48,000 km or 24 months

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

Maintenance
8-14
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 120Fuel Tank, Fuel Filler Cap,
Canister, Vapor Hose I I I I I
Fuel Tank Air Filter I I I I I Fuel Filter I I I I I
Fuel Lines, Hoses and Connections I I I I I
Air Cleaner Filter I R I R I R I R I R Brake fluid I I R I I R I I R ISpark plugs Replace every 160,000 km or 84 months
Engine Coolant First, replace 192,000 km or 120 months.
After that, replace every 48,000 km or 24 months

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