2003 Hyundai Sonata radiator

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
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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

DO-IT-YOURSELF MAINTENANCE 6- 11
!
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G070A03Y-AATCHANGING THE AIR CLEANER FILTER
The replacement of air cleaner filter is per-
formed in the following manner.
1. Unsnap the clips around the cover.
2. When this is done, the cover can be lifted off,
the old filter removed and the new filter put in
its place.
Genuine Hyundai replacement parts are rec-
ommended.
G080A02A-AATWINDSHIELD WIPER BLADES
The wiper blades should be carefully inspected
from time to time and cleaned to remove accu-
mulations of road film or other debris. To clean
the wiper blades and arms, use a clean sponge
or cloth with a mild soap or detergent and water.
If the wipers continue to streak or smear the
glass, replace them with genuine Hyundai re-
placement parts or their equivalent.
NOTE:o Do not operate the wipers on dry glass.
This can result in more rapid wear of the
wiper blades and may scratch the glass.
o Keep the blade rubber out of contact
with petroleum products such as engine
oil, gasoline, etc.
G090A01A-AATFILLING THE WASHER RESERVOIR
The washer fluid reservoir supplies fluid to the
windshield washer system.
A good quality washer fluid should be used to fill
the washer reservoir. The fluid level should be
checked more frequently during bad weather or
whenever the washer system is in more fre-
quent use.
The capacity of the washer reservoir is 3.2 U.S.
quarts (3.0 Liters).
CAUTION:Operating your vehicle without using a
proper air cleaner filter in place can result in
excessive engine wear.
CAUTION:o Radiator anti-freeze (engine coolant)
should not be used in the washer system
because it will damage the car’s finish.
o The washer lever should not be pulled
and the washer should not be operated
if the washer reservoir is empty. This can
damage the washer fluid pump.
G070A01YTHEF119
G230A03YT

DO-IT-YOURSELF MAINTENANCE 6- 13
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G110C01Y-AATTransaxle Fluid CapacityThe fluid capacity of the automatic transaxle is
8.2 U.S. quarts.
WARNING:The transaxle fluid level should be checked
when the engine is at normal operating
temperature. This means that the engine,
radiator, exhaust system etc., are very hot
so you should exercise great care not to
burn yourself during this procedure.
G110D02L-AATTo Check the Transaxle Fluid Level
Park the car on level ground with the parking
brake engaged. When the transaxle fluid level
is checked, the transaxle fluid should be at
normal operating temperature and the engine
idling.While the engine is idling, apply the brakes and
move the gear selector lever from "P" to each
of its other positions — "R", "N", "D" — and then
return to "N" or "P". With the engine still idling:
1. Open the hood, being careful to keep hands,
long hair and clothing clear of any moving
parts.
2. Remove the transaxle dipstick, wipe it clean,
reinsert the dipstick as far as it will go, then
remove it again. Now check the fluid level on
the dipstick. It should be in the "HOT" range
on the dipstick.
3. If the transaxle fluid level is low, use a funnel
to add transaxle fluid through the dipstick
tube until the level reaches the "HOT" range.
Do not overfill.
C090A01YG110D02Y-1
DOHC V6

DO-IT-YOURSELF MAINTENANCE 6- 15
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G130A01A-AATCHECKING THE CLUTCH FLUID
To Check the Clutch FluidG130B02A-AATTo Replace the Fluid
Recommended brake fluid conforming to DOT
3 or DOT 4 specification should be used. The
reservoir cap must be fully tightened to avoid
contamination from foreign matter or moisture.
NOTE:Do not allow any other liquids to contami-
nate the brake fluid. Seal damage will result.
WARNING:Handle brake fluid carefully. It can damage
your vision if it gets into your eyes. Use only
DOT 3 or DOT 4 specification fluid from a
sealed container. Do not allow the fluid can
or reservoir to remain open any longer than
required. This will prevent entry of dirt and
moisture which can damage the brake sys-
tem and cause improper operation.
To add brake fluid, first wipe away any dirt then
unscrew the fluid reservoir cap. Slowly pour the
recommended fluid into the reservoir. Do not
overfill. Carefully replace the cap on the reser-
voir and tighten.
!
The clutch fluid level in the master cylinder
should be checked when performing other un-
der hood services. The system should be
checked for leakage at the same time. Check
to make certain that the clutch fluid level is
always between the "MAX" and "MIN" level
markings on the fluid reservoir. Fill as required.
Fluid loss indicates a leak in the clutch system
which should be inspected and repaired imme-
diately. Consult your Hyundai dealer.
WARNING:Use caution when handling brake fluid. It
can damage your vision if you get it in your
eyes. It will also damage your vehicle's
paint if spilled on it and not removed imme-
diately.
G140A01A-AATAIR CONDITIONING CARE
Keeping the Condenser Clean
The air conditioning condenser (and engine
radiator) should be checked periodically for
accumulation of dirt, dead insects, leaves, etc.
These can interfere with maximum cooling ef-
ficiency. When removing such accumulations,
brush or hose them away carefully to avoid
bending the cooling fans.
G130A01Y
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DO-IT-YOURSELF MAINTENANCE 6- 29
G200C03Y-GATJUNCTION BOX DESCRIPTION
Under hood junction box
Note:
Not all junction box description in this manual may be applicable to
your vehicle. It is accurate at the time of printing. When you inspect the
junction box on your vehicle, refer to the junction box label
DESCRIPTION
COND FAN
PWR WIND
ABS 2
IGN SW-1
ABS 1
IGN SW-2
RAD FAN MTR
FUEL PUMP
HD LP LO
ABS
INJECTOR
A/C COMPR
ATM RLY
ECU RLY
IG COIL
O2 SNSR
ECU
HORN
HEAD LP HI
HEAD LP WASH
DRL
FR FOG
HEAD LP LO RH
DIODE-1
SPARE
SPARE
SPARE
SPARE
DIODE-2
BLOWER
PWR FUSE-2
PWR AMP
SUNROOF
TAIL LP
PWR FUSE-1
ECU
RR HTDFUSE RATING
20A
40A
20A
30A
40A
30A
30A
20A
15A
10A
10A
10A
20A
30A
20A
15A
15A
10A
15A
20A
15A
15A
15A
-
30A
20A
15A
10A
-
30A
30A
20A
15A
20A
30A
10A
30APROTECTED COMPONENTS
Condenser fan
Power window
ABS
Ignition switch
ABS
Ignition switch
Radiator fan motor
Fuel pump
Headlights (LO)
ABS
Injector
Air-con compressor
ATM Relay
Engine control unit relay
Ignition coil
Oxygen sensor
Engine control unit
Horn
Headlights (HI)
-
DRL
Front fog lights
Headlight (Low)
Diode 1
Spare fuse
Spare fuse
Spare fuse
Spare fuse
Diode 2
Blower
Power fuse 2
Power amp
Sunroof
Tail lights
Power fuse 1
ECU
Rear window defroster
HEF-165C

9- 4 VEHICLE SPECIFICATIONS
J080A09Y-AATLUBRICATION CHART
API SH, Hot Climate: SAE 20W-40, 20W-50 (ABOVE 32°F OR 0°C)
SG or Normal Climate:SAE 10W-30 10W-40, 10W-50 (ABOVE -10°F OR -23°C)
SG/CD Cold Climate:SAE 5W-30 5W-40 (BELOW 100°F OR 38°C)
Hyundai Genuine Parts MTF 75W/90 (API GL-4)
HYUNDAI GENUINE ATF, DIAMOND ATF SP-III or SK ATF SP-III
Ethylene glycol base for aluminum radiator
PSF-3 type fluid
DOT 3 or DOT 4 Equivalent Engine
TransaxleManual
Auto
Coolant
Power steering
Brakes and clutch fluid
Quantity (us.qts) (lmp.qts, liter)
2.2 (1.8, 2.1)
8.2 (6.9, 7.8)
0.95 (0.9)
As requiredItem
Oil & Coolant Standard2.4L 2.7L (V6)
Drain & refill;
Without oil filter :
4.2 (3.5, 4.0)
With oil filter :
4.5 (3.76, 4.3)Drain & refill;
Without oil filter :
4.45 (3.69, 4.2)
With oil filter :
4.77 (3.96, 4.5)
7.7 (6.4, 7.3)9.0 (7.6, 8.6)