2020 Hyundai Ioniq Hybrid cooling

6-13
What to do in an emergency
6
7. If you cannot find the cause of the
overheating, wait until the engine
temperature has returned to nor-
mal. Then, if coolant has been
lost, carefully add coolant to the
reservoir to bring the fluid level in
the reservoir up to the halfway
mark.
8. Proceed with caution, keeping
alert for further signs of overheat-
ing. If overheating happens again,
we recommend that you call an
authorised HYUNDAI dealer for
assistance.
Serious loss of coolant indi-
cates a leak in the cooling
system and we recommend
the system be checked by an
authorised HYUNDAI dealer.
When the engine overheats
from low engine coolant, sud-
denly adding engine coolant
may cause cracks in the
engine. To prevent damage,
add engine coolant slowly in
small quantities.
CAUTION
Never remove the
engine coolant cap
and/or inverter coolant
cap or the drain plug
whilst 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 anticlockwise slowly to
the first stop. Step back whilst
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 anticlockwise to remove
it.
WARNING

7-11
7
Maintenance
Normal maintenance schedule
Number of months or driving distance, whichever comes first
Months1224364860728496
Km×1,000153045607590105120
Cooling system
Inspect “Coolant level adjustment and leak” every day
At first, inspect 60,000 km or 48 months
after that, inspect every 30,000 km or 24 months
Engine coolant / Inverter coolant *7At first, replace 210,000 km or 120 months
after that, replace every 30,000 km or 24 months*8
Dual clutch transmission fluid *9II
Engine clutch actuator fluidRRRR
Engine clutch actuator hose and lineIIIIIIII
Battery condition (12V, Plug-in hybrid vehicle)IIIIIIII
Brake lines, hoses and connectionsIIIIIIII
Brake pedalIIII
Parking brakeIIII
Brake fluidIIIIIIII
Brake discs and padsIIIIIIII
MAINTENANCE
INTERVALS
MAINTENANCE
ITEM
I : Inspect and if necessary, adjust, correct, clean or replace.
R : Replace or change.
*
7: When adding coolant, use only deionized water or soft water for your vehicle and never mix hard water in the coolant filled at
the factory.
An improper coolant mixture can result in serious malfunction or engine damage.
*
8: For your convenience, it can be replaced prior to it's interval when you do maintenance of other items.
*9: Dual clutch transmission (DCT) fluid should be changed anytime it has been submerged in water.

7-15
7
Maintenance
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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 authorised
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 authorised
HYUNDAI dealer.
Vapour hose and fuel filler cap
The vapour hose and fuel filler cap
should be inspected at those inter-
vals specified in the maintenance
schedule. Make sure a new vapour
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.

7-19
7
Maintenance
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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 travelling 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 authorised HYUNDAI dealer
for a cooling system inspection.
OAE076005
OAEPH078004
■Engine coolant
■Inverter coolant

7-20
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
whilst 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 anticlockwise slowly to
the first stop. Step back whilst
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 anticlockwise to remove
it.
WARNING
OAE076006
OAEPH07800
■Engine coolant cap
■Inverter coolant cap

7-21
7
Maintenance
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.
Always turn off the engine
unless the vehicle has to be
inspected with the engine on. Be
cautious as the cooling fan may
operate if the negative (-) battery
terminal is not disconnected.
WARNING
Make sure the coolant cap is
properly closed after refilling
coolant. Otherwise the engine
could be overheated whilst
driving.
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