2021-2026 Hyundai I20 4 Door Maintenance -> Engine coolant User Manual
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Maintenance -> Engine coolant for Your Hyundai I20 4 Door Third Generation (2021-2026)

Maintenance  
ENGINE COOLANT  
The high-pressure cooling system  
has a reservoir filled with year-round  
antifreeze coolant. The reservoir is filled  
at the factory.  
Checking the coolant level  
„ꢀType A  
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.  
OBC3090014  
„ꢀType B  
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It may cause water pump failure and  
engine seizure, etc.  
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.  
9-16  
09  
„ꢀType A  
śꢀ 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.  
śꢀ 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.  
OBC3090006  
„ꢀType B  
WARNING  
The electric motor (cooling  
fan) is controlled by engine  
coolant temperature,  
refrigerant pressure and  
vehicle speed.  
OBC3090007  
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.  
WARNING  
Do not remove a radiator cap/  
engine coolant reservoir cap.  
śꢀ Never attempt to remove the radiator  
cap/engine coolant reservoir cap  
whilst the engine is operating or hot.  
The electric motor (cooling fan) may  
operate until you disconnect the  
negative battery cable.  
śꢀ Doing so might lead to cooling  
system failure and engine damage  
and could result in serious personal  
injury from escaping hot coolant or  
steam.  
śꢀ 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.  
9-17  
Maintenance  
Recommended engine coolant  
WARNING  
śꢀ When adding coolant, use only  
distilled (deionized) water for your  
vehicle and never mix hard water in  
the coolant filled at the factory. An  
incorrect coolant mixture can result  
in serious malfunction or engine  
damage.  
śꢀ The engine in your vehicle has  
aluminium engine parts and must be  
protected by an phosphate based  
ethylene-glycol coolant to prevent  
corrosion and freezing.  
OBC3090015  
śꢀ DO NOT USE alcohol or methanol  
coolant or mix them with the specified  
coolant.  
1. Check if the radiator cap label is  
straight In front.  
2. Make sure that the tiny protrusions  
inside the radiator cap should be  
securely interlocked.  
śꢀ Do not use a solution that contains  
more than 60% antifreeze or less than  
35% antifreeze, which would reduce  
the effectiveness of the solution.  
For mixture percentage, refer to the  
following table.  
Mixture Percentage  
Ambient  
(volume)  
Temperature  
Antifreeze  
Water  
65  
35  
-15°C (5°F)  
-25°C (-13°F)  
-35°C (-31°F)  
-45°C (-49°F)  
40  
60  
50  
60  
50  
40  
Information  
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9-18  
09  
Changing the engine coolant  
We recommend that coolant be changed  
by an authorised HYUNDAI according to  
the Maintenance Schedule.  
NOTICE  
Put a thick cloth or fabric around the  
radiator cap before refilling the coolant  
in order to prevent the coolant from  
overflowing into engine parts such as  
alternator.  
WARNING  
Do not use engine coolant or antifreeze  
in the washer fluid reservoir.  
Engine coolant can severely obscure  
visibility when sprayed on the  
windscreen and may cause loss of  
vehicle control resulting in an accident.  
Engine coolant may also cause damage  
to paint and body trim.  
9-19  

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