2018 Hyundai Sonata air condition

7
Maintenance
7-15
I : Inspect : Inspect and if necessary, adjust, correct, clean or replace.
R : Replace or change.
*
1: The drive belt should be replaced when cracks occur or tension is reduced excessively.
*2: If TOP TIER Detergent Gasoline is not available, one bottle of additive is recommended. Additives are available from your authorized HYUNDAI dealer along with information on how to use them. Do not mix other additives.
Normal Maintenance Schedule (Theta 2.4 GDI)
Months1224364860728496108120132144156168180
Miles×1,0007.51522.53037.54552.56067.57582.59097.5105112.5
Km×1,0001224364860728496108120132144156168180
Drive belts *1At first, inspect at 60,000 miles or 72 months.
Thereafter, inspect every 15,000 miles or 24 months
Engine oil and engine oil filterRRRRRRRRRRRRRRR
Fuel additives *2Add fuel additives every 7,500 miles or 12 months
Air cleaner filterIIRIIRIIRIIRIIR
Spark plugsReplace every 97,500 miles
Rotate tiresRotate tires every 7,500 miles
Climate control air filterRRRRRRRRRRRRRRR
Vacuum hoseIIIIIIIIIIIIIII
Engine coolantAt first, replace at 120,000 miles or 120 months.
Thereafter, replace every 30,000 miles or 24 months
Battery conditionIIIIIIIIIIIIIII
MAINTENANCE
INTERVALS
MAINTENANCE
ITEM

Maintenance
7-16
I : Inspect : Inspect and if necessary, adjust, correct, clean or replace.
R : Replace or change.
*
3: Fuel filter & Fuel tank air filter are considered to be maintenance free\
but periodic inspection is recommended for this mainte-nance schedule depends on fuel quality. If there are some important safety matters like fuel flow restriction, surging, loss of
power, hard starting problem, etc. replace the fuel filter immediately regardless of maintenance schedule a\
nd consult an
authorized HYUNDAI dealer for details.
Normal Maintenance Schedule (Theta 2.4 GDI) (CONT)
Months1224364860728496108120132144156168180
Miles×1,0007.51522.53037.54552.56067.57582.59097.5105112.5
Km×1,0001224364860728496108120132144156168180
Brake lines, hoses and connectionsIIIIIIIIIIIIIII
Disc brakes and padsIIIIIIIIIIIIIII
Driveshaft and bootsIIIIIIIIIIIIIII
Suspension mounting boltsIIIIIIIIIIIIIII
Air conditioner refrigerantIIIIIIIIIIIIIII
Air conditioner compressorIIIIIIIIIIIIIII
Exhaust pipe and mufflerIIIIIIIIIIIIIII
Automatic transaxle fluid (if equipped)No check, No service required
Steering gear rack, linkage and bootsIIIIIIIIIIIIIII
Vapor hose, fuel filler cap and fuel tankIIIIIII
Fuel tank air filter *3IIIIIII
Fuel filter *3IIIIIII
Fuel lines, hoses and connectionsIII
MAINTENANCE INTERVALS
MAINTENANCE
ITEM

Maintenance
7-18
Maintenance Under Severe Usage Conditions (Theta 2.4 GDI)
The following items must be serviced more frequently on cars normally used under severe driving conditions. Refer
to the chart below for the appropriate maintenance intervals.
R : Replace I : Inspect and, after inspection, clean, adjust, repair or replace if neces\
sary
MAINTENANCE ITEMMAINTENANCEOPERATIONMAINTENANCE INTERVALSDRIVING
CONDITION
Engine oil and filterREvery 3,750 miles or 6 monthsA, B, C, D, E, F, G, H, I, J, K
Air cleaner filterRMore frequentlyC, E
Spark plugsRMore frequentlyA, B, H, I, K
Automatic transmission fluid
(if equipped)REvery 60,000 milesA, C, E, F, G, I
Front brake disc/pads, calipersIMore frequentlyC, D, G, H
Rear brake shoes or disc/padsIMore frequentlyC, D, G, F

7
Maintenance
7-19
Severe Driving Conditions
A - Repeatedly driving short distances of less than 5 miles (8 km) in normal temperature or less than 10 miles (16 km)
in freezing temperature
B - Extensive engine idling or low speed driving for long dis- tances
C - Driving on rough, dusty, muddy, unpaved, graveled or salt- spread roads
D - Driving in areas using salt or other corrosive materials or in very cold weather E - Driving in sandy areas
F - Driving in heavy traffic area over 90°F (32°C)
G- Driving on uphill, downhill, or mountain road
H - Towing a Trailer, or using a camper, or roof rack
I - Driving as a patrol car, taxi, other commercial use or vehicle
towing
J - Driving over 106 mph (170 km/h)
K - Frequently driving in stop-and-go conditions
MAINTENANCE ITEMMAINTENANCE OPERATIONMAINTENANCE INTERVALSDRIVING
CONDITION
Parking brakeIMore frequentlyC, D, G, H
Steering gear box, linkage & boots/
lower arm ball joint, upper arm ball
joint
IMore frequentlyC, D, E, F, G, H, I
Suspension mounting boltsIMore frequentlyC, D, E, F, G, H, I
Drive shafts and bootsIEvery 3,750 miles or 6 monthsC, D, E, F, G, H, I
Climate control air filter
(for evaporator and blower unit)RMore frequentlyC, E

7-20
Maintenance
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Engine Oil and Filter
The engine oil and filter should be
changed at the intervals specified in
the maintenance schedule. If the car
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 peri-
odically for proper tension and
adjusted as necessary.
Fuel Filter
A clogged filter can limit the speed at
which the vehicle may be driven,
damage the emission system and
cause multiple issues such as hard
starting. If an excessive amount of
foreign matter accumulates in the
fuel tank, the filter may require
replacement more frequently. After
installing a new filter, run the engine
for several minutes, and check for
leaks at the connections. Fuel filters
should be installed by an authorized
HYUNDAI dealer.
Fuel Lines, Fuel Hoses and
Connections
Check the fuel lines, fuel hoses and
connections for leakage and dam-
age. Have an authorized HYUNDAI
dealer replace any damaged or leak-
ing parts immediately.
Vapor Hose and Fuel Filler
Cap
The vapor hose and fuel filler cap
should be inspected at those inter-
vals specified in the maintenance
schedule. Make sure a new vapor
hose or fuel filler cap is correctly
replaced.
Air Cleaner Filter
A genuine HYUNDAI air cleaner filter
is recommended when the filter is
replaced.
Spark Plugs
Make sure to install new spark plugs
of the correct heat range.

7-22
Maintenance
Brake Hoses and Lines
Visually check for proper installation,
chafing, cracks, deterioration and
any leakage. Replace any deteriorat-
ed or damaged parts immediately.
Brake Fluid
Check brake fluid level in the brake
fluid reservoir. The level should be
between the MIN and the MAX
marks on the side of the reservoir.
Use only hydraulic brake fluid con-
forming to DOT 3 or DOT 4 specifi-
cation.
Parking Brake
Inspect the parking brake system
including the parking brake pedal
and cables.
Brake Discs, Pads, Calipers
and Rotors
Check the pads for excessive wear,
discs for run out and wear, and
calipers for fluid leakage.
Exhaust Pipe and Muffler
Visually inspect the exhaust pipes,
muffler and hangers for cracks, dete-
rioration, or damage. Start the
engine and listen carefully for any
exhaust gas leakage. Tighten con-
nections or replace parts as neces-
sary.
Suspension Mounting Bolts
Check the suspension connections
for looseness or damage. Retighten
to the specified torque.
Steering Gear Box, Linkage &
Boots/Lower Arm Ball Joint
With the vehicle stopped and the
engine off, check for excessive free-
play in the steering wheel. Check the
linkage for bends or damage. Check
the dust boots and ball joints for
deterioration, cracks, or damage.
Replace any damaged parts.
Drive Shafts and Boots
Check the drive shafts, boots and
clamps for cracks, deterioration, or
damage. Replace any damaged
parts and, if necessary, repack the
grease.
Air Conditioning Refrigerant
Check the air conditioning lines and
connections for leakage and damage.

7-29
7
Maintenance
B
BR
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Checking the Brake Fluid Level
Check the fluid level in the reservoir
periodically. The fluid level should be
between MAX and MIN marks on the
side of the reservoir.
Before removing the reservoir cap
and adding brake fluid, clean the
area around the reservoir cap thor-
oughly to prevent brake fluid contam-
ination. If the level is low, add the specified
brake fluid to the MAX level. The level
will fall with accumulated mileage.
This is a normal condition associated
with the wear of the brake linings. If
the fluid level is excessively low, have
the brake system checked by an
authorized HYUNDAI dealer.
Do not allow brake fluid to con-
tact the vehicle’s body paint, as
paint damage will result.
Brake fluid, which has been exposed to open air for an
extended time should NEVER be
used as its quality cannot be
guaranteed. It should be dis-
posed of properly.
Do not use the wrong kind of brake fluid. A few drops of miner-
al based oil, such as engine oil, in
your brake system can damage
brake system parts.
Information
Use only the specified brake fluid
(refer to "Recommended Lubricants
and Capacities" in chapter 8).
i
NOTICE
If the brake system requires fre-
quent additions of fluid this
could indicate a leak in the
brake system. Have the vehicle
inspected by an authorized
HYUNDAI dealer.
WARNING
Do not allow brake fluid to come
in contact with your eyes. If
brake fluid comes in contact
with your eyes, flush your eyes
with clean water for at least 15
minutes and get immediate
medical attention.
WARNING
OLF074008N

7-32
Maintenance
4. Replace the air cleaner filter. 5. Pull up the lever (1) to the LOCK position.
6. Install the cover and make sure the inner hooks (2) to be inserted
to holes (3).
7. Check if the cover is firmly installed.
Information
If the vehicle is operated in extremely
dusty or sandy areas, replace the ele-
ment more often than the usual rec-
ommended intervals (refer to
"Maintenance Under Severe Usage
Conditions" in this chapter).
Do not drive with the air cleanerfilter removed. This will result in
excessive engine wear.
When removing the air cleaner filter, be careful that dust or dirt
does not enter the air intake, or
damage may result.
Use HYUNDAI genuine parts, use of non-genuine parts could
damage the air flow sensor.
NOTICE
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