cooling HYUNDAI I20 2023 User Guide

8-10
Emergency situations
6. If you cannot find the cause of the
overheating, wait until the engine
temperature has returned to normal.
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.
7. Proceed with caution, keeping alert
for further signs of overheating.
If overheating happens again, we
recommend that you call a HYUNDAI
authorised repairer for assistance.
NOTICE

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leak in the cooling system and we
recommend the system be checked
by a HYUNDAI authorised repairer.

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low engine coolant, suddenly adding
engine coolant may cause cracks
in the engine. To prevent damage,
add engine coolant slowly in small
quantities.

9-11
09
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 a HYUNDAI authorised
repairer.
Spark plugs
(for petrol engine)
Make sure to install new spark plugs of
the correct heat range.
When assembling parts, be sure to
wipe out foreign substances inside
and outside of the boot bottom of the
ignition coil and the insulator of the
spark plug with a soft cloth to prevent
contamination of the spark plug
insulator.
WARNING
Do not disconnect and inspect spark
plugs when the engine is hot. You may
burn yourself.
Cooling system
Check the cooling system parts, such
as radiator, coolant reservoir, hoses and
connections for leakage and damage.
Replace any damaged parts.
Engine coolant
The coolant should be changed at the
intervals specified in the maintenance
schedule.
Manual transmission fluid/iMT
system actuator fluid
(if equipped)
Inspect the Manual transmission fluid/
iMT system actuator fluid according to
the maintenance schedule.
Automatic transmission fluid
(if equipped)
Automatic transmission fluid should
not be checked under normal usage
conditions.
We recommend that the automatic
transmission fluid is changed by a
HYUNDAI authorised repairer according
to the maintenance schedule.
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9-13
09
ENGINE OIL
Engine oil is used for lubricating,
cooling, and operating various hydraulic
components in the engine. Engine oil
consumption whilst driving is normal,
and it is necessary to check and refill the
engine oil regularly. Also, check and refill
the oil level within the recommended
maintenance schedule to prevent
deterioration of oil performance.
Check the engine oil following the below
procedure.
Checking the engine oil level
„Smartstream G 1.0 T-GDi/ Smartstream G1.0 T-GDi (48V) MHEV
OBC3090008
„Smartstream G1.2
OBC3090009
„Petrol 1.4
OBC3090010
1. Follow all of the oil manufacturer’s
precautions.
2. Be sure the vehicle is on the level
ground in P (Park) with the parking
brake set and the wheels blocked.
3. Turn the engine on and warm
the engine up until the coolant
temperature reaches a constant
normal temperature.
4. Turn the engine off, remove the oil
filler cap and pull the dipstick out.
Wait for 15 minutes for the oil to
return to the oil pan.
5. Wipe the dipstick clean and re-insert
it fully.
6. Pull the dipstick out again and check
the level. The level should be between
the F-L line.

9-16
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 concentration level at least once
a year, at the beginning of the winter
season, and before travelling to a colder
climate.
NOTICE

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low engine coolant, suddenly adding
engine coolant may cause cracks
in the engine. To prevent damage,
add engine coolant slowly in small
quantities.

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It may cause water pump failure and
engine seizure, etc.
Checking the coolant level
OBC3090014
„Type A
„Type B
OBC3090061
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 a HYUNDAI
authorised repairer.
ENGINE COOLANT

9-17
09
OBC3090006
„Type A
„Type B
OBC3090007
WARNING
Do not remove a radiator cap/
engine coolant reservoir cap.

[Never attempt to remove the radiator
cap/engine coolant reservoir cap
whilst the engine is operating or hot.

[Doing so might lead to cooling
system failure 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/
engine coolant reservoir cap. Wrap
a thick towel around it, and turn it
counterclockwise 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 counterclockwise to remove
it.

[Even if the engine is not operating,
do not remove the radiator cap/
engine coolant reservoir cap or the
drain plug whilst 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.
The electric motor (cooling fan) may
operate until you disconnect the
negative battery cable.

9-50
Maintenance
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Fuse Name Symbol Relay Name Type
RLY.1 E30Main Relay MINI
RLY.2 E31
Cooling Fan Relay MINI
RLY.3 E32
Wiper (High) Relay MICRO
RLY.4 E33
Wiper (Low) Relay MICRO
RLY.5 E34
Fuel Pump Relay MICRO
RLY.6 E36
Start Relay MICRO
RLY.7 E36
RR WIPER Relay MICRO
RLY.10 E39 A/CON Relay MICRO
RLY.11 E40
Horn Relay MICRO
RLY.12 E41
B/Alarm Horn Relay MICRO
RLY.13 E42
Blower Relay MICRO
RLY.14 E43
PTC Heater Relay MICRO

9-52
Maintenance
Fuse Name Symbol (A) Circuit Protected
IGN COIL15A Ignition Coil #1/#2/#3
ECU5
20A ECM
ECU6
15A ECM
SENSOR 1
10AE/R Junction Block (RLY.2/10),
Oil Control Valve #1/#2 (Intake/Exhaust),
Purge Control Solenoid Valve, RCV Control, V_Oil
Pump Solenoid Valve
SENSOR 2
10A Oxygen Sensor (Up/Down)
RR DEFOG
40A ICU Junction Block (Rear Defogger Relay)
ABS 1
40A ESP Control Module
BLOWER
40A E/R Junction Block (RLY.13)
PTC
HEATER
50A E/R Junction Block (RLY.14)
ABS 2
30A ESP Control Module
POWER
OUTLET
40A ICU Junction Block (Power Outlet Relay)
WIPER 2
10A E/T Junction Block (RLY. 4), Front Wiper Motor, IBU
SENSOR3
15A E/T Junction Block (RLY. 5)
MHSG
10A Mild Hybrid Starter & Generator Motor
BATTERY
C/FAN
10A BMS Cooling Fan, E/R Junction Block (Fuse - F8)
WIPER 1
25AE/T Junction Block (RLY. 4), Front Wiper Motor,
Ignition Switch
BATTERY
MANAGEMENT2
10ABMS Control Module, E/R Junction Block (Fuse -
F8)
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9-53
09
6PDUWVWUHDP*
RR WIPER Relay Symbol Relay Name Type
RLY.1 E30Main Relay MINI
RLY.3 E32
Wiper (High) Relay MICRO
RLY.4 E33
Wiper (Low) Relay MICRO
RLY.5 E34
Fuel Pump Relay MICRO
RLY.6 E36
Start Relay MICRO
RLY.7 E36
RR WIPER Relay MICRO
RLY.8 E37
A/CON Relay MICRO
RLY.9 E38
Cooling Fan High Relay MICRO
RLY.10 E39
Cooling Fan Low Relay MICRO
RLY.11 E40
Horn Relay MICRO
RLY.12 E41
B/Alarm Horn Relay MICRO
RLY.13 E42
Blower Relay MICRO
RLY.14 E43
PTC Heater Relay MICRO

9-56
Maintenance
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Fuse Name Symbol Relay Name Type
RLY.1 E30Main Relay MINI
RLY.3 E32
Wiper (High) Relay MICRO
RLY.4 E33
Wiper (Low) Relay MICRO
RLY.5 E34
Fuel Pump Relay MICRO
RLY.6 E36
Start Relay MICRO
RLY.7 E36
RR WIPER Relay MICRO
RLY.9 E38
Cooling Fan High Relay MICRO
RLY.10 E39
Cooling Fan Low Relay MICRO
RLY.11 E40
Horn Relay MICRO
RLY.12 E41
B/Alarm Horn Relay MICRO
RLY.13 E42 Blower Relay MICRO
RLY.14 E43
PTC Heater Relay MICRO