2021 HYUNDAI I20 cooling

10-25
10
Vacuum crankcase ventilation
hoses (if equipped)
Inspect the surface of hoses for
evidence of heat and/or mechanical
damage. Hard and brittle rubber,
cracking, tears, cuts, abrasions, and
excessive swelling indicate deterioration.
Particular attention should be paid to
examine those hose surfaces nearest to
high heat sources, such as the exhaust
manifold.
Inspect the hose routing to assure that
the hoses do not come in contact with
any heat source, sharp edges or moving
component which might cause heat
damage or mechanical wear. Inspect
all hose connections, such as clamps
and couplings, to make sure they are
secure, and that no leaks are present.
Hoses should be replaced immediately if
there is any evidence of deterioration or
damage.
Air cleaner filter
We recommend that the air cleaner filter
be replaced by an authorized HYUNDAI
dealer.
Spark plugs
Make sure to install new spark plugs of
the correct heat range.
WARNING
Do not disconnect and inspect spark
plugs when the engine is hot. You may
burn yourself.
Valve clearance (For 1.0 T-GDi)
Inspect for excessive valve noise and/or
engine vibration and adjust if necessary.
We recommend that the system be
serviced by an authorized HYUNDAI
dealer.
Cooling system
Check cooling system components, such
as radiator, coolant reservoir, hoses and
connections for leakage and damage.
Replace any damaged parts.
Coolant
The coolant should be changed at the
intervals specified in the maintenance
schedule.
Manual transmission fluid
(if equipped)
Inspect the manual transmission fluid
according to the maintenance schedule.
Automated manual transmission
fluid (if equipped)
Inspect the Automated manual
transmission fluid according to the
maintenance schedule.

10-32
Maintenance
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 climate.
NOTICE
• Do not drive with no engine coolant.
It may cause water pump failure and
engine seizure, etc.
• When the engine overheats from
low engine coolant, suddenly adding
engine coolant may cause cracks
in the engine. To prevent damage,
add engine coolant slowly in small
quantities.
Checking the coolant level
OBI3090008OBI3090008
„„Petrol Engine (1.0 T-GDi)Petrol Engine (1.0 T-GDi)
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 F (Full) and L (Low) marked on
the side of the coolant reservoir when
the engine is cool.
If the coolant level is low, add enough
distilled (deionized) water.
Bring the level to F (Full), but do
not overfill. If frequent additions are
required, we recommend that the
system be inspected by an authorized
HYUNDAI dealer.
ENGINE COOLANT

10-33
10
OBI3090009OBI3090009
„„Petrol Engine (1.0 T-GDi)Petrol Engine (1.0 T-GDi)
OBC3090006OBC3090006
„„Petrol Engine (Smartstream G1.2)Petrol Engine (Smartstream G1.2)
WARNING
Removing radiator cap
• Never attempt to remove the radiator
cap while the engine is operating or
hot. Doing so might lead to cooling
system and engine damage and could
result in serious personal injury from
escaping hot coolant or steam.• 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 operating,
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 serious injury.
WARNING
The electric motor (cooling
fan) is controlled by engine
coolant temperature,
refrigerant pressure and
vehicle speed. It may
sometimes operate even when the
engine is not running. Use extreme
caution when working near the blades
of the cooling fan so that you are not
injured by a rotating fan blades. As the
engine coolant temperature decreases,
the electric motor will automatically
shut off. This is a normal condition.

10-76
Maintenance
Engine Compartment Fuse Panel (1.5 WGT)
Fuse Name SymbolFuse
RatingCircuit Protected
C/FAN50A E/R Junction Block (RLY.2)
SENSOR 6
15A PM Sensor
ECU5
20A ECU
SENSOR 1
10AE/R Junction Block (RLY.2/3),
Oil Control Valve #1/#2 (Intake/Exhaust),
Purge Control Solenoid Valve
SENSOR 2
10A Oxygen Sensor (Up/Down)
SENSOR 3
10A COOLING FAN, A/CON COMPRESSOR
RR DEFOG
40A ICU Junction Block (Rear Defogger Relay)
ABS 1
40A ABS/ESP Control Module
ABS 2
30A ABS/ESP Control Module
BLOWER
40A E/R Junction Block (RLY.10)
WIPER 2
10A E/R Junction Block (RLY. 5), Front Wiper Motor, IBU
SENSOR 4
10A Inlet Metering Valve, E/R Junction Block (RLY. 6)
SENSOR 5
10AAir Flow Sensor, EGR Cooling Bypass Solenoid Valve,
WGR Vacuum Modulator
WIPER 1
25A E/R Junction Block (RLY. 5), Front Wiper Motor