2023-2026 Hyundai Kona SUV Maintenance -> Engine coolant User Manual
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Maintenance -> Engine coolant for Your Hyundai Kona SUV Second Generation (2023-2026)

Engine 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 climate.  
Checking the coolant level  
Smartstream G1.6 T-GDI  
2C_EngineCoolant  
Smartstream G2.0 ATKINSON  
2C_EngineCoolant_2  
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, have your vehicle  
inspected by an authorized HYUNDAI dealer for a cooling system inspection.  
638 Maintenance  
WARNING  
Never remove the radiator cap or the drain plug while the engine and radiator are hot. Hot  
coolant and steam may blow out under pressure, causing serious injury.  
Turn the engine off and wait until the engine 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.  
Information  
The coolant level is influenced by the engine temperature. Before checking or refilling the  
coolant, turn the engine off.  
WARNING  
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 vehicle 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.  
Maintenance 639  
WARNING  
Make sure the coolant cap is properly closed after refilling coolant. Otherwise the engine  
could be overheated while driving.  
1
Check if the coolant cap label is straight in front.  
2C_CheckCoolantCapLocked  
2 Make sure that the tiny protrusions inside the coolant cap is securely interlocked.  
Recommended coolant  
• When adding coolant, use only deionized water, distilled water or soft water for your  
vehicle and never mix hard water in the coolant filled at the factory.  
• An incorrect coolant mixture can result in severe malfunction or engine damage.  
• The engine in your vehicle has aluminum engine parts and must be protected by a  
phosphate-based ethylene glycol coolant to prevent corrosion and freezing.  
• Do not use alcohol or methanol coolant or mix them with the specified coolant.  
• 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 mixing percentage, refer to the following table:  
Mixture Percentage (volume)  
Ambient Temperature  
Antifreeze  
Water  
5 °F (-15 °C)  
-13 °F (-25 °C)  
-31 °F (-35 °C)  
-49 °F (-45 °C)  
35  
40  
50  
60  
65  
60  
50  
40  
Information  
If in doubt about the mix ratio, a 50 % water and 50 % antifreeze mix is the easiest to mix  
together as it will be the same quantity of each. It is suitable to use for most temperature  
ranges of -31 °F (-35 °C) and higher.  
640 Maintenance  
Changing coolant  
Have the coolant changed by an authorized HYUNDAI dealer according to the  
Maintenance Schedule at the beginning of this chapter.  
WARNING  
Do not use engine coolant or antifreeze in the washer fluid reservoir.  
Engine coolant can severely obscure visibility when sprayed on the windshield and may  
cause loss of vehicle control resulting in an accident.  
Engine coolant may also cause damage to paint and body trim.  
NOTICE  
To prevent damage to engine parts, put a thick towel around the engine coolant cap  
before refilling the coolant to prevent the coolant from overflowing into engine parts,  
such as the alternator.  
Maintenance 641  

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