Hyundai Sonata

723
Maintenance
The high-pressure cooling system has a
reservoir filled with year-round antifreeze
coolant. The reservoir is filled at the fac-
tory.
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
Check the condition and connections of
all cooling system hoses and heater
hoses. Replace any swollen or deterio-
rated hoses.
The coolant level should be filled
between F and L marks on the side of the
coolant reservoir when the engine is
cool.
If the coolant level is low, add enough
specified coolant to provide protection
against freezing and corrosion. Bring the
level to F, but do not overfill. If frequent
additions are required, see an authorized
HYUNDAI dealer for a cooling system
inspection.

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(Continued)
• Turn the engine off and wait untilit cools down. Use extreme care
when removing the radiator 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.
• Even if the engine is not operat- ing, do not remove the radiator
cap or the drain plug while the
engine and radiator are hot. Hot
coolant and steam may still blow
out under pressure, causing seri-
ous injury.
ENGINE COOLANT
WARNING
- Removing
radiator cap
• Never attempt to remove the radi-
ator cap while the engine is oper-
ating or hot. Doing so might lead
to cooling system and engine
damage and could result in seri-
ous personal injury from escap-
ing hot coolant or steam.
(Continued)

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Maintenance24
7Recommended engine coolant• When adding coolant, use only deion-
ized water or soft water for your vehicle
and never mix hard water in the
coolant filled at the factory. An improp-
er coolant mixture can result in serious
malfunction or engine damage.
• The engine in your vehicle has aluminum engine parts and must be protected by
an ethylene-glycol-based coolant to pre-
vent corrosion and freezing.
• DO NOT USE alcohol or methanol coolant or mix them with the specified
coolant.
• Do not use a solution that contains more than 60% antifreeze or less than
35% antifreeze, which would reduce
the effectiveness of the solution.
For mixture percentage, refer to the fol-
lowing table.
Changing the coolantHave coolant changed by an authorized
HYUNDAI dealer according to the
Maintenance Schedule at the beginning
of this section.
WARNING -
Radiator cap
Do not remove the radiator cap
when the engine and radiator are
hot. Scalding hot coolant and
steam may blow out under pres-
sure causing serious injury.
WARNING -
Coolant
• Do not use radiator coolant or antifreeze in the washer fluid
reservoir.
• Radiator coolant can severely obscure visibility when sprayed
on the windshield and may cause
loss of vehicle control or damage
to paint and body trim.
5°F (-15°C) 35 65
-13°F (-25°C) 40 60
-31°F (-35°C) 50 50
-49°F (-45°C) 60 40Ambient
Temperature Mixture Percentage (volume)
Antifreeze Water
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CAUTION
Put a thick cloth or fabric around
the radiator cap before refilling the coolant in order to prevent thecoolant from overflowing intoengine parts such as generator.

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725
Maintenance
BRAKE/CLUTCH FLUIDChecking the brake/clutch fluid
level Check the fluid level in the reservoir peri-
odically. The fluid level should be
between MAX and MIN marks on the
side of the reservoir.
Before removing the reservoir cap and
adding brake/clutch fluid, clean the area
around the reservoir cap thoroughly to
prevent brake/clutch fluid contamination.
If the level is low, add fluid to the MAX
level. The level will fall with accumulated
mileage. This is a normal condition asso-
ciated with the wear of the brake linings.
If the fluid level is excessively low, have
the brake system or clutch (if equipped)
checked by an authorized HYUNDAI
dealer.
Use only the specified brake fluid. (Referto “Recommended lubricants or capaci-ties” in section 8.)
Never mix different types of fluid.
WARNING -
Brake/clutch
fluid
When changing and adding brake
fluid, handle it carefully. Do not let it
come in contact with your eyes. If
brake fluid should come in contact
with your eyes, immediately flush
them with a large quantity of fresh
tap water. Have your eyes examined
by a doctor as soon as possible.
WARNING -
Loss of brake/
clutch fluid
In the event the brake system
requires frequent additions of fluid,
the vehicle should be inspected by
an authorized HYUNDAI dealer.
CAUTION
Do not allow brake fluid to contactthe vehicle's body paint, as paintdamage will result. Brake fluid, which has been exposed to open airfor an extended time should never be used as its quality cannot beguaranteed. It should be disposed of properly. Don't put in the wrongkind of fluid. A few drops of miner- al-based oil, such as engine oil, inyour brake system can damage brake system parts.

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Maintenance26
7WASHER FLUIDChecking the washer fluid level The reservoir is translucent so that you
can check the level with a quick visual
inspection.
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 cli-
mates to prevent freezing.
WARNING -
Coolant
• Do not use radiator coolant or
antifreeze in the washer fluid
reservoir.
• Radiator coolant can severely obscure visibility when sprayed
on the windshield and may cause
loss of vehicle control or damage
to paint and body trim.
• Windshield washer fluid agents contain some amounts of alcohol
and can be flammable under cer-
tain circumstances. Do not allow
sparks or flame to contact the
washer fluid or the washer fluid
reservoir. Damage to the vehicle
or occupants could occur.
• Windshield washer fluid is poi- sonous to humans and animals.
Do not drink and avoid contacting
windshield washer fluid. Serious
injury or death could occur.
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727
Maintenance
PARKING BRAKEChecking the parking brakeType ACheck whether the stroke is within spec-
ification when the parking brake pedal is
depressed with 44 lb (20 kg, 196 N) of
force. Also, the parking brake alone should
securely hold the vehicle on a fairly steep
grade. If the stroke is more or less than
specified, have the parking brake adjusted
by an authorized HYUNDAI dealer.
Stroke : 4~5 notch
Type BCheck the stroke of the parking brake by
counting the number of “clicks’’ heard
while fully applying it from the released
position. Also, the parking brake alone
should securely hold the vehicle on a fair-
ly steep grade. If the stroke is more or
less than specified, have the parking
brake adjusted by an authorized
HYUNDAI dealer.
Stroke : 5 “clicks’’ at a force of 44 lbs (20 kg, 196 N).

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Maintenance28
7AIR CLEANER Filter replacement It must be replaced when necessary, and
should not be cleaned and reused.
You can clean the filter when inspecting
the air cleaner element.
Clean the filter by using compressed air. 1. Loosen the air cleaner cover attaching
clips and open the cover. 2. Wipe the inside of the air cleaner.
3. Replace the air cleaner filter.
4. Lock the cover with the cover attaching
clips.

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729
Maintenance
Replace the filter according to the
Maintenance Schedule.If the vehicle is operated in extremelydusty or sandy areas, replace the ele-ment more often than the usual recom-mended intervals. (Refer to“Maintenance under severe usage condi-tions” in this section.)
Filter inspectionThe 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 per-
forming the following procedure, and be
careful to avoid damaging other compo-
nents.
Filter replacement1. Open the glove box and remove the support strap (1).
CAUTION
• Do not drive with the air cleaner removed; this will result in exces-sive engine wear.
• When removing the air cleaner fil- ter, be careful that dust or dirtdoes not enter the air intake, ordamage may result.
• Use a HYUNDAI genuine part. Use of non-genuine parts could dam-age the air flow sensor.
CLIMATE CONTROL AIR FILTER

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Maintenance30
72. With the glove box open, remove the
stoppers by turning them counter-
clockwise on both sides. 3. Remove the climate control air filter
cover while pressing the lock on the
right of the cover. 4. Replace the climate control air filter.
5. Reassemble in the reverse order of
disassembly.
✽NOTICEWhen replacing the climate control air
filter install it properly. Otherwise, the
system may produce noise and the effec-
tiveness of the filter may be reduced.

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731
Maintenance
WIPER BLADES Blade inspection✽NOTICECommercial hot waxes applied by auto-
matic car washes have been known to
make the windshield difficult to clean.
Contamination of either the windshield or
the wiper blades with foreign matter can
reduce the effectiveness of the wind-
shield wipers. Common sources of con-
tamination are insects, tree sap, and hot
wax treatments used by some commer-
cial car washes. If the blades are not wip-
ing properly, clean both the window and
the blades with a good cleaner or mild
detergent, and rinse thoroughly with
clean water.
Blade replacementWhen the wipers no longer clean ade-
quately, the blades may be worn or
cracked, and require replacement.

1JBA5122
CAUTION
To prevent damage to the wiper
blades, do not use gasoline, kerosene, paint thinner, or othersolvents on or near them.
CAUTION
To prevent damage to the wiperarms or other components, do notattempt to move the wipers manual-ly.
CAUTION
The use of a non-specified wiper blade could result in wiper malfunc-tion and failure.

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Maintenance32
7Front windshield wiper blade1. Raise the wiper arm. 2. Lift up the wiper blade clip. Then pull
down the blade assembly and remove
it. 3. Install the new blade assembly in the
reverse order of removal.
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CAUTION
Do not allow the wiper arm to fallagainst the windshield, since it maychip or crack the windshield.

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