2003 Hyundai Sonata radiator cap

1- 38 FEATURES OF YOUR HYUNDAI
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B290A01A-AATENGINE COOLANT TEMPERATURE
GAUGE
WARNING:
Never remove the radiator cap when the
engine is hot. The engine coolant is under
pressure and could erupt and cause severe
burns. Wait until the engine is cool before
adding coolant to the reservoir.
The needle on the engine coolant temperature
gauge should stay in the normal range. If it
moves across the dial to "H" (Hot), pull over and
stop as soon as possible and turn off the engine.
Then open the hood and check the coolant
reservoir level and the water pump drive belt. If
you suspect cooling system trouble, have your
cooling system checked by a Hyundai dealer as
soon as possible.
B300A01A-AATSPEEDOMETER
Your Hyundai's speedometer is calibrated in
miles per hour (on the outer scale) and kilome-
ters per hour (on the inner scale).HEF-009HEF-008B
B280A01A-AATFUEL GAUGE
The needle on the gauge indicates the approxi-
mate fuel level in the fuel tank. The fuel capacity
is given in Section 9.
HEF-010 B270A01A-AAT
BRAKE PAD WEAR WARNING SOUND
The front disc brake pads have wear indicators
that should make a high-pitched squealing or
scraping noise when new pads are needed. The
sound may come and go or be heard all the time
when the vehicle is moving. It may also be heard
when the brake pedal is pushed down firmly.
Excessive rotor damage will result if the worn
pads are not replaced. See your Hyundai dealer
immediately.

1- 58 FEATURES OF YOUR HYUNDAI
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B560A02Y-AATREMOTE FUEL-FILLER LID RELEASE
The fuel-filler lid may be opened from inside the
vehicle by pushing up on the fuel-filler lid opener
located on the driver side door.
NOTE:If the fuel-filler lid will not open because ice
has formed around it, tap lightly or push on
the lid to break the ice and release the lid. Do
not pry on the lid. If necessary, spray around
the lid with an approved de-icer fluid (do
not use radiator anti-freeze) or move the
vehicle to a warm place and allow the ice to
melt.
B550A02Y-AATHIGH-MOUNTED REAR STOP LIGHT
In addition to the lower-mounted rear stoplights
on either side of the car, the high mounted rear
stoplight in the center of the rear window also
lights when the brakes are applied.WARNING:o Gasoline vapors are dangerous. Before
refueling, always stop the engine and
never allow sparks or open flames near
the filler area. If you need to replace the
filler cap, use a genuine Hyundai re-
placement part.
o If you open the fuel filler cap during high
ambient temperatures, a slight "pres-
sure sound" may be heard. This is nor-
mal and not a cause for concern.
Whenever you open the fuel filler cap,
turn it slowly.
o Make sure the fuel filler cap is replaced
and securely seated after fueling. Failure
to replace or fully seat the fuel filler cap
will result in fuel vapors escaping into
the atmosphere and the check engine
(MIL) indicator illuminating.
B550A03Y
HEF-132AB560A02Y
Fuel Cap Holder

3- 4 WHAT TO DO IN AN EMERGENCY
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!WARNING:While the engine is running, keep hair,
hands and clothing away from moving parts
such as the fan and drive belts to prevent
injury.
D040A01Y-AATSPARE TIRE
The following instructions for the temporary
spare tire should be observed:
1. Check inflation pressure as soon as practi-
cal after installing the spare tire, and adjust
to the specified pressure. The tire pressure
should be periodically checked and main-
tained at the specified pressure while the tire
is stored.
Tire Size
Inflation Pressure
T125/80R15
60 psi (420 kPa) 5. If the water pump drive belt is broken or
engine coolant is leaking out, stop the engine
immediately and call the nearest Hyundai
dealer for assistance.
WARNING:Do not remove the radiator cap when the
engine is hot. This can allow coolant to be
blown out of the opening and cause seri-
ous burns.
6. If you cannot find the cause of the overheat-
ing, wait until the engine temperature has
returned to normal. Then, if coolant has been
lost, carefully remove the radiator cap and
add coolant to bring the fluid level in the
reservoir up to the halfway mark.
7. Proceed with caution, keeping alert for fur-
ther signs of overheating. If overheating
happens again, call a Hyundai dealer for
assistance.
CAUTION:Serious loss of coolant indicates there is a
leak in the cooling system and this should
be checked as soon as possible by a Hyundai
dealer.
!
4. As the temporary spare tire is specifically
designed for your car, it should not be used
on any other vehicle.
5. The temporary spare tire should not be used
on any other wheels, nor should standard
tires, snow tires, wheel covers or trim rings
be used with the temporary spare wheel. If
such use is attempted, damage to these
items or other car components may occur.
6. The temporary spare tire pressure should
be checked once a month while the tire is
stored.
Spare Tire Pressure
2. The spare tire should only be used tempo-
rarily and should be returned to the luggage
compartment as soon as the original tire can
be repaired or replaced.
3. Continuous use at speeds of over 50 mph
(80 km/h) is not recommended.
CAUTION:o Do not use snow chains with your tem-
porary spare tire.
o Do not use more than one temporary
spare tire at a time.
!

6- 2 DO-IT-YOURSELF MAINTENANCE
1. Engine oil filler cap
2. Brake Booster
3. Brake fluid reservoir
4. Clutch fluid reservoir (If installed)
5. Under hood junction box 6. Windshield washer fluid reservoir
7. Power steering fluid reservoir
8. Engine oil level dipstick
9. Engine cover
G010A02Y-GATENGINE COMPARTMENT (2.4 DOHC)
10.Automatic transaxle fluid level dipstick
(If installed)
11.Radiator cap
12.Air cleaner
13.Coolant reservoir cap
14.Battery
HEF-064
12345
6 7 8 9 10 11 12 13 14

DO-IT-YOURSELF MAINTENANCE 6- 3
1. Air cleaner
2. Brake fluid reservoir
3. Brake booster
4. Windshield washer fluid reservoir
5. Power steering fluid reservoir6. Engine oil level dipstick
7. Engine cover
8. Engine oil filler cap
9. Automatic transaxle fluid level dipstick
(If installed)
G010B03Y-AATENGINE COMPARTMENT (2.7 V6 Delta)
10.Radiator cap
11.Battery
12.Coolant reservoir cap
13.Under hood junction box
G010B04Y
1
23
4 5 6 7 8 9 10 11 12
13

DO-IT-YOURSELF MAINTENANCE 6- 7
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4. When the oil has stopped draining, replace
the drain plug using a new washer and
retighten by turning it clockwise.
Tightening torque is: 3.5 ~ 4.5 kgf.m
5. Remove the oil filter by turning it counter-
clockwise with a oil filter wrench of the proper
size. A certain amount of oil will come out
when you remove the filter. So be sure to
have your drain pan in place underneath it.
6. Install a new oil filter in accordance with the
instructions on the carton or on the filter itself.
Do not over-tighten.
Tightening torque is: 1.2 ~ 1.6 kgf.m
Be sure that the mounting surface on the
engine is clean and that the old gasket is
removed completely. Lubricate the new
gasket on the filter with clean engine oil
before installation.
7. Refill the crankcase with the recommended
engine oil. Refer to the specification in chap-
ter 9 for engine oil capacity.
8. Start the engine and check to be sure no oil
is leaking from the drain plug or oil filter.
9. Shut off the engine and recheck the oil level.G050A01A-AATCHECKING AND CHANGING THE EN-
GINE COOLANT
WARNING:
Do not remove the radiator cap when the
engine is hot. When the engine is hot, the
engine coolant is under pressure and may
erupt through the opening if the cap is
removed. You could be seriously burned if
you do not observe this precaution. Do not
remove the radiator cap until the radiator is
cool to the touch.
NOTE:Always dispose of used engine oil in an
environmentally acceptable manner. It is
suggested that it be placed in a sealed
container and taken to a service station for
reclamation. Do not pour the oil on the
ground or put it into the household trash.
WARNING:Used motor oil may cause irritation or can-
cer of the skin if left in contact with the skin
for prolonged periods of time. Wash your
hands thoroughly with soap and warm
water as soon as possible after handling
used oil.

6- 8 DO-IT-YOURSELF MAINTENANCE
G050D02A-AATTo Change the Engine CoolantThe engine coolant should be changed at those
intervals specified in the vehicle maintenance
schedule in Section 5.
CAUTION:Engine coolant can damage the finish of
your car. If you spill engine coolant on the
car, wash it off thoroughly with clean water.
1. Park the car on level ground, set the park-
ing brake and remove the radiator cap when
cool.
2. Be sure your drain receptacle is in place.
Open the drain cock on the radiator. Allow all
the engine coolant to drain from the cooling
system, then securely close the drain cock.
3. Check Section 9 for the capacity of the
cooling system in your car. Then, following
the manufacturer's directions on the engine
coolant container, add the appropriate quan-
tity of coolant to the radiator.
G050C01A-AAT
To Check the Coolant LevelThe coolant level can be seen on the side of the
plastic coolant reservoir. The level of the cool-
ant should be between the "L" and "F" lines on
the reservoir when the engine is cool. If the level
is below the "L" mark, add engine coolant to
bring it up between "L" and "F". If the level is low,
inspect for coolant leaks and recheck the fluid
level frequently. If the level drops again, visit
your Hyundai dealer for an inspection and
diagnosis of the reason.Ambient
temperature
°C ( °F)
-15 (5)
-25 (-13)
-35 (-31)
-45 (-49)
65%
60%
50%
40% 35%
40%
50%
60%Water Antifreeze
solution Engine Coolant concentration
G050B01A-AATRecommended Engine Coolant
Use a high quality ethylene-glycol coolant in a
50/50 mix with water. The engine coolant should
be compatible with aluminum engine parts.
Additional corrosion inhibitors or additives should
not be used. The cooling system must be
maintained with the correct concentration and
type of engine coolant to prevent freezing and
corrosion. Never allow the concentration of
antifreeze to exceed the 60% level or go below
the 35% level, or damage to the cooling system
may result. For proper concentration when
adding or replacing the engine coolant, refer to
the following table.
G050B01Y

DO-IT-YOURSELF MAINTENANCE 6- 9
!
4. Turn the radiator cap counterclockwise with-
out pressing down on it, until it stops. This
relieves any pressure remaining in the cool-
ing system. And remove the radiator cap by
pushing down and turning counterclock-
wise.
Now fill the radiator with clean demineralized
or distilled water. Continue to add clean
demineralized or distilled water in small quan-
tities until the fluid level stays up in the
radiator neck.
5. Start the engine, top off the radiator with
water and then add coolant to the reservoir
until the level is between "L" and "F".
6. Replace the radiator and reservoir caps and
check to be sure the drain cocks are fully
closed and not leaking.G060A02Y-AATSPARK PLUGS
Your engine was originally equipped with plati-
num-tipped spark plugs.
Platinum-tipped spark plugs will last longer than
conventional type spark plugs and can be
identified by blue lines on the ceramic shell.
NOTE:Do not clean or regap platinum-tipped spark
plugs.
WARNING:The cooling fan is controlled by engine
coolant temperature and may sometimes
operate even when the engine is not run-
ning. Use extreme caution when working
near the blades of the coolant fan so that
you are not injured by a rotating fan blade.
As the engine coolant temperature de-
creases, the fan will automatically shut off.
This is a normal condition.
HSM392G060B04Y-AAT
Replacing the Spark PlugsThe spark plugs should be changed at the
intervals specified in the vehicle maintenance
schedule in Section 5 or whenever engine
performance indicates they should be changed.
Symptoms that suggest poor spark plug perfor-
mance include engine misfiring under load, loss
of fuel economy, poor acceleration, etc. When
spark plugs are replaced, always use spark
plugs recommended by Hyundai. The use of
other spark plugs can result in loss of perfor-
mance, radio interference or engine damage.
NOTE:When replacing the spark plugs, always use
the genuine parts recommended.
Recommended Spark Plugs:
Type
RN10PYP4 (CHAMPION)
PGR5C-11 (NGK)
RC10PYB4 (CHAMPION)
PFR5N-11 (NGK)Remark
For 2.4L only
For 2.7L only
DOHC V6
0.1~1.1 mm 0.1~1.1 mm