2018 Hyundai Ioniq Hybrid cooling

7-21
7
Maintenance
EXPLANATION OF SCHEDULED MAINTENANCE ITEMS
Engine oil and filter
The engine oil and filter should be
changed at the intervals specified in
the maintenance schedule. If the
vehicle is being driven in severe con-
ditions, more frequent oil and filter
changes are required.
HSG (Hybrid starter & genera-
tor) belt
The HSG belt should be changed at
the intervals specified in the mainte-
nance schedule.
Fuel lines, fuel hoses and con-
nections
Check the fuel lines, fuel hoses and
connections for leakage and dam-
age. We recommend an authorized
HYUNDAI dealer replace any dam-
aged or leaking parts immediately.
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.
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.
Cooling system
Check cooling system components,
such as radiator, coolant reservoir,
hoses and connections for leakage
and damage. Replace any damaged
parts.
Engine coolant/inverter
coolant
The coolant should be changed at
the intervals specified in the mainte-
nance schedule.

7-25
7
Maintenance
ENGINE COOLANT/INVERTER COOLANT
The high-pressure cooling system
has a reservoir filled with year-round
antifreeze coolant. The reservoir is
filled at the factory.
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 cli-
mate.Checking the coolant level
Check the condition and connections
of all cooling system hoses and
heater hoses. Replace any swollen
or deteriorated hoses.The coolant level should be filled
between the MAX and the MIN
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 bring
the level to the MAX mark, but do not
overfill. If frequent additions are
required, we recommend that you
see an authorized HYUNDAI dealer
for a cooling system inspection.
OAE076005
OAE076004
■Engine coolant
■Inverter coolant

7-26
Maintenance
Information
The engine coolant and/or inverter
coolant level is influenced by the
hybrid system temperature. Before
checking or refilling the engine
coolant and/or inverter coolant, turn
the hybrid vehicle off.
i
Never remove the
engine coolant cap
and/or inverter coolant
cap or the drain plug
while the engine and
radiator are hot. Hot coolant and
steam may blow out under pres-
sure, causing serious injury.
Turn the hybrid system off and
wait until the engine cools down.
Use extreme care when remov-
ing the engine coolant cap
and/or inverter coolant 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.
WARNING
OAE076006
OAE076007
■Engine coolant cap
■Inverter coolant cap

7-27
7
MaintenanceThe electric motor for the cooling fan
is controlled by engine coolant tem-
perature, refrigerant pressure and
vehicle speed. As the engine coolant
temperature decreases, the electric
motor will automatically shut off. This
is a normal condition. If your vehicle
is equipped with GDI, the electric
motor for the cooling fan may begin
to operate at any time and continue
to operate until you disconnect the
negative battery cable.The electric motor for
the cooling fan may
continue to operate
or start up when the
engine is not running
and can cause serious injury.
Keep hands, clothing and tools
away from the rotating fan blades
of the cooling fan.
WARNING
Make sure the coolant cap is
properly closed after refilling
coolant. Otherwise the engine
could be overheated while driv-
ing.
1. Check if the coolant cap label
is straight In front.
(Continued)
WARNING
OTL075062
■Engine compartment front view
(Continued)
2. Make sure that the tiny pro-
trusions inside the coolant
cap is securely interlocked.
OAE076050
■Engine compartment rear view

I-3
Battery (12 volt, Plug-in hybrid vehicle) .....................7-38
Battery recharging......................................................7-40
Battery cooling duct .....................................................2-24
Battery saver function .................................................3-111
Before driving .................................................................5-4
Blind spot detection (BSD) system ..............................5-40
Bluetooth
®Wireless Technology hands-free ..................4-4
Bottle holder ...............................................................3-147
Brake fluid ....................................................................7-29
Brake system.................................................................5-27
Anti-lock brake system (ABS) ..................................5-31
Disc brakes wear indicator ........................................5-28
Electronic stability control (ESC) .............................5-33
Emergency stop signal (ESS) ....................................5-38
Good braking practices ..............................................5-39
Hill-start assist control (HAC)...................................5-38
Parking brake .............................................................5-28
Power brakes..............................................................5-27
Vehicle stability management (VSM) .......................5-36
Bulb replacement
Daytime running lamp ...............................................7-76
Front position lamp....................................................7-68
Front turn signal lamp ...............................................7-68
Headlamp ...................................................................7-68
Headlamp aiming .......................................................7-72
High mounted stop lamp ...........................................7-82Interior light bulb .......................................................7-82
License plate light bulb .............................................7-82
Rear combination lamp bulb .....................................7-77
Rear fog lamp ............................................................7-82
Side repeater lamp ....................................................7-76
Bulb wattage ...................................................................8-3
Button start/stop, see engine start/stop button................5-9
Camera (Rear view)....................................................3-120
Capacities (Lubricants) ...................................................3-6
Care
Exterior care...............................................................7-84
Interior care................................................................7-89
Tire care .....................................................................7-42
Cellular phone charger................................................3-150
Center console storage................................................3-145
Central door lock switch...............................................3-14
Certification label ...........................................................8-8
Chains
Tire chains................................................................5-100
Checking tire inflation pressure ...................................7-44
Child restraint system (CRS)........................................2-38
Booster seats ..............................................................2-40
Children always in the rear ........................................2-38
Forward-facing child restraint system .......................2-40
Installing a child restraint system (CRS)...................2-41
I
Index
B
C

I-4
ISOFIX anchorage and top-tether anchorage
for children.................................................................2-42
Rearward-facing child restraint system .....................2-39
Securing a child restraint system seat with
"Top-tether Anchorage" system ...............................3-44
Securing a child restraint system with
a lap/shoulder belt....................................................3-46
Securing a child restraint system with the
"ISOFIX Anchorage System"................................2-43
Selecting a child restraint system (CRS) ...................2-39
Child-protector rear door lock ......................................3-16
Cigarette lighter ..........................................................3-152
Clean air......................................................................3-144
Climate control air filter ...............................................7-33
Clock ...........................................................................3-152
Clothes hanger ............................................................3-153
Coasting guide ..............................................................5-26
Combined instrument, see instrument cluster ..............3-45
Compact spare tire replacement ...................................7-47
Coolant..........................................................................7-25
Cooling fluid, see engine coolant/inverter coolant ......7-25
Crankcase emission control system..............................7-92
Cruise control system ...................................................5-73
Cup holder ..................................................................3-147
Curtain air bags.............................................................2-58Dashboard illumination, see instrument panel
illumination.................................................................3-47
Dashboard, see instrument cluster ................................3-45
Day/night rearview mirror ............................................3-23
Daytime running light (DRL) .....................................3-111
Defogging (Windshield) .............................................3-140
Defroster .....................................................................3-142
Rear window defroster.............................................3-143
Defrosting (Windshield) .............................................3-140
Dimensions .....................................................................8-2
Display illumination, see instrument panel
illumination.................................................................3-47
Displays, see instrument cluster ...................................3-45
Distance to empty (for cluster type B) .........................3-52
Door locks.....................................................................3-12
Auto door lock/unlock features .................................3-16
Central door lock switch ............................................3-14
Child-protector rear door lock ...................................3-16
Drinks holders, see cup holders..................................3-147
Driver position memory system ...................................3-18
Recalling memory positions ......................................3-19
Storing memory positions ..........................................3-18
Driver's air bag .............................................................2-54
Driver's knee airbag ......................................................2-54
Driving at night.............................................................5-97
Driving in flooded areas ...............................................5-98
Driving in the rain ........................................................5-97
Index
D

I-11
Seats ................................................................................2-4
Air ventilation seats ...................................................2-22
Battery cooling duct...................................................2-24
Front seat adjustment ...................................................2-7
Front seat warmers.....................................................2-21
Headrest .....................................................................2-16
Rear seat adjustment ..................................................2-13
Rear seat warmers ......................................................2-24
Safety precautions........................................................2-6
Shift lock system ..........................................................5-22
Shift-lock release ..........................................................5-22
Side air bags .................................................................2-57
Smart cruise control system .........................................5-79
Smart key ........................................................................3-7
Battery replacement ...................................................3-10
Mechanical key ............................................................3-9
Smooth cornering .........................................................5-97
Snow tires .....................................................................5-99
Spare tire
Compact spare tire replacement ................................7-47
Special driving conditions
Driving at night..........................................................5-97
Driving in flooded areas ............................................5-98
Driving in the rain .....................................................5-97
Hazardous driving conditions ....................................5-96
Highway driving ........................................................5-98
Rocking the vehicle ...................................................5-96
Smooth cornering.......................................................5-97Speed limit control system ...........................................5-71
Speed sensing door lock ...............................................3-16
Speedometer .................................................................3-47
SPORT mode ................................................................5-21
Starting difficulties, see engine will not start .................6-4
Steering wheel ..............................................................3-20
Electric power steering (EPS) ...................................3-20
Heated steering wheel ................................................3-21
Horn ...........................................................................3-22
Power steering ...........................................................3-20
Tilt steering / Telescopic steering ..............................3-21
Steering wheel audio controls ........................................4-3
Storage compartment ..................................................3-145
Center console storage .............................................3-145
Glove box.................................................................3-145
Multi box .................................................................3-146
Sunglass holder ........................................................3-146
Sunglass holder ...........................................................3-146
Sunroof .........................................................................3-32
Automatic reverse ......................................................3-34
Resetting the sunroof .................................................3-35
Sliding the sunroof.....................................................3-33
Sunroof opening and closing .....................................3-33
Sunshade ....................................................................3-35
Tilting the sunroof .....................................................3-34
Sunroof inside air recirculation ..................................3-144
Sunvisor ......................................................................3-148
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Index