2011 Hyundai Sonata Hybrid cooling

Maintenance
24 7
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.
The engine coolant level is influ-
enced by hybrid system tempera-
ture. Before filling the engine
coolant, turn the hybrid vehicle off,
fill the engine coolant carefully.
(Continued)
COOLANT
Inverter coolant
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 everyday.
If it is near or at MIN, add enough coolant
between MIN and MAX and check the
cooling system for air bleed at an author-
ized HYUNDAI dealer.
Engine coolant
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 per every day, at the begin-
ning of the winter season, and before
traveling to a colder climate.
Checking the coolant level
OYFH071070N
CAUTION
Do not confuse the cap of engine
coolant and inverter coolant. If not,
the coolant circulation problem of
engine or Hybrid system may occur
because the cap pressure is different.
CAUTION
When adding coolant, be careful
not to overfill.

725
Maintenance
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
distilled (deionized) water to provide pro-
tection 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.
Recommended engine and inverter
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.
OYFH071005N
(Continued)
Turn the engine off and wait until
it 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.

753
Maintenance
Multi fuse
If the multi fuse is blown, it must be
removed as follows:
1. Turn off the engine.
2. Disconnect the negative battery cable.
3. Remove the fuse panel on the right
side in the engine compartment.
4. Remove the nuts shown in the picture
above.
5. Replace the fuse with a new one of the
same rating.
6. Reinstall in the reverse order of
removal.
✽ ✽
NOTICE
If the multi fuse is blown, consult an
authorized HYUNDAI dealer.
Oil pump cooling fuse/
Cooling fan fuse
If the oil pump cooling fuse or cooling fan
fuse is blown, it must be removed as fol-
lows:
1. Turn off the engine.
2. Disconnect the negative battery cable.
3. Remove the fuse panel on the right
side in the engine compartment.
4. Replace the fuse with a new one of the
same rating.
5. Reinstall in the reverse order of
removal.
Sub-relay fuse
If the sub-relay fuse is blown, it must be
removed as follows:
1. Turn off the engine.
2. Disconnect the negative battery cable.
3. Replace the fuse with a new one of the
same rating.
4. Reinstall in the reverse order of
removal.
OYFH071088NOYFH071089NOYFH071072N

I3
Index
California perchlorate notice ........................................7-76
Camera (Rear view) ......................................................4-60
Capacities (Lubricants) ..................................................8-4
Capacity/weight ..............................................................8-3
Care
Exterior care ............................................................7-67
Interior care ............................................................7-71
Tire care ..................................................................7-36
Cargo weight ................................................................5-50
Center console storage ..................................................4-90
Central door lock switch ..............................................4-21
Certification label ..........................................................5-48
Certification label ............................................................8-6
Chains
Tire chains ..............................................................5-42
Changing tires (with spare tire) ....................................6-13
Checking tire inflation pressure ....................................7-37
Child restraint system....................................................3-26
Lower anchor system ..............................................3-32
Seat belt ..................................................................3-28
Tether anchor system ..............................................3-30
Child-protector rear door lock ......................................4-22
Climate control air filter ......................................4-78, 7-28
Clock (Digital) ..............................................................4-95
Clothes hanger ..............................................................4-96Combined instrument, see instrument cluster ..............4-43
Compact spare tire (with spare tire)..............................6-18
Compact spare tire replacement ....................................7-41
Components of the tire mobility kit ..............................6-22
Consumer information ....................................................8-8
Coolant ..........................................................................7-22
Cooling fluid, see engine coolant ................................7-22
Crankcase emission control system ..............................7-73
Cruise control system ....................................................5-31
Cup holder ....................................................................4-93
Curtain air bag ..............................................................3-51
Dashboard illumination, see instrument panel
illumination ................................................................4-44
Dashboard, see instrument cluster ................................4-43
Defogging (Windshield)................................................4-87
Defogging logic (Windshield) ......................................4-87
Defroster (Rear window) ..............................................4-70
Defrosting (Windshield)................................................4-87
Digital clock ..................................................................4-95
Dimensions ......................................................................8-2
Display illumination, see instrument panel
illumination ................................................................4-44
Displays, see instrument cluster....................................4-43
Door locks ....................................................................4-19
Central door lock switch ........................................4-21
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