2017-2023 Kia Rio 4 Door Maintenance -> Engine coolant User Manual
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Maintenance -> Engine coolant for Your Kia Rio 4 Door Third Generation (2017-2023)

Maintenance  
ENGINE COOLANT  
The high-pressure cooling system  
has a reservoir filled with year round  
antifreeze coolant. The reservoir is  
filled at the factory.  
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 cool-  
ing system.  
Checking the coolant level  
WARNING  
Removing radiator  
cap  
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 cli-  
mate.  
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.  
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.  
• 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.  
8 23  
Maintenance  
Recommended engine coolant  
WARNING - Cooling fan  
• When adding coolant, use only  
deionized water or soft water for  
your vehicle and never mix hard  
water in the coolant filled at the fac-  
tory. An improper coolant mixture  
can result in serious malfunction or  
engine damage.  
Use caution when working near  
the blade of the cooling fan.The  
electric motor (cooling fan) is  
controlled by engine coolant  
temperature, refrigerant pres-  
sure and vehicle speed. it may  
sometimes operate even when  
the engine is not running.  
• The engine in your vehicle has alu-  
minum engine parts and must be  
protected by an ethylene-glycol  
with phosphate based coolant to  
prevent corrosion and freezing.  
OSC077016N  
Check the condition and connections  
of all cooling system hoses and  
heater hoses. Replace any swollen  
or deteriorated hoses.  
• DO NOT USE alcohol or methanol  
coolant or mix them with the spec-  
ified coolant.  
The coolant level should be filled  
between F and L marks on the side  
of the coolant reservoir when the  
engine is cool.  
• Do not use a solution that contains  
more than 60% antifreeze or less  
than 35% antifreeze. This would  
reduce the effectiveness of the  
solution.  
If the coolant level is low, add enough  
specified coolant to provide protec-  
tion against freezing and corrosion.  
Bring the level to F, but do not over-  
fill. If frequent additions are required,  
see an authorized Kia dealer for a  
cooling system inspection.  
NOTICE  
Make sure that the coolant cap is  
properly closed after refilling the  
coolant. Otherwise the engine could  
overheat while driving.  
8 24  
Maintenance  
For mixture percentage, refer to the  
following table.  
Changing the coolant  
Have the coolant changed by an  
authorized Kia dealer according to  
the Maintenance Schedule at the  
beginning of this chapter.  
Mixture Percentage  
(volume)  
Ambient  
Temperature  
Antifreeze  
Water  
65  
5°F (-15°C)  
-13°F (-25°C)  
-31°F (-35°C)  
-49°F (-45°C)  
35  
40  
50  
60  
CAUTION  
60  
Put a thick cloth or fabric  
around the radiator cap before  
refilling the coolant in order to  
prevent the coolant from over-  
flowing into engine parts such  
as the alternator.  
50  
40  
OSC078050N  
WARNING  
Radiator cap  
Do not remove the radiator cap  
when the engine and radiator  
are hot. Scalding hot coolant  
and steam may blow out under  
pressure which may result in  
serious injury.  
8 25  

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