2016-2023 Hyundai Ix35 SUV Maintenance -> Engine Coolant User Manual
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Maintenance -> Engine Coolant for Your Hyundai Ix35 SUV Second Generation (2016-2023)

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  
WARNING  
(Continued)  
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.  
Check the antifreeze protection and  
coolant concentration level at least  
once a year, at the beginning of the  
winter season, and before traveling  
to a colder climate.  
Removing radiator  
cap  
Even if the engine is not oper-  
ating, do not remove the radi-  
ator cap or the drain plug  
while the engine and radiator  
are hot. Hot coolant and  
steam may still blow out  
under pressure, causing seri-  
ous injury.  
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.  
CAUTION  
When the engine overheats  
from low engine coolant, sud-  
denly adding engine coolant  
may cause cracks in the  
engine. To prevent damage,  
add engine coolant slowly in  
small quantities.  
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.  
Do not drive with no engine  
coolant. It may cause water  
pump failure and engine  
seizure, etc.  
7
(Continued)  
7-31  
Maintenance  
Recommended engine coolant  
WARNING  
• 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.  
The electric motor  
(cooling fan) is con-  
trolled by engine  
coolant temperature,  
refrigerant pressure  
and vehicle speed. It may some-  
times 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 engine in your vehicle has alu-  
minum engine parts and must be  
protected by an ethylene-glycol-  
based coolant to prevent corrosion  
and freezing.  
OLMB073005  
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 (MAX) and L (MIN) 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, which would  
reduce the effectiveness of the  
solution.  
The electric motor (cooling fan)  
may operate until you discon-  
nect the negative battery cable.  
If the coolant level is low, add enough  
distilled (deionized) or soft water.  
Bring the level to F (MAX), but do not  
overfill.  
If frequent additions are required, we  
recommend that the system be  
inspected by  
HYUNDAI dealer.  
an  
authorized  
7-32  
For mixture percentage, refer to the  
following table.  
Changing the coolant  
We recommend that the coolant be  
replaced by an authorized HYUNDAI  
dealer.  
Mixture Percentage  
(volume)  
Ambient  
Temperature  
Antifreeze  
Water  
65  
CAUTION  
-15°C (5°F)  
-25°C (-13°F)  
-35°C (-31°F)  
-45°C (-49°F)  
35  
40  
50  
60  
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 generator.  
50  
40  
OLMB073006  
WARNING  
Radiator cap  
WARNING  
Coolant  
Do not use radiator coolant or  
antifreeze in the washer fluid  
reservoir.  
Do not remove the radiator cap  
when the engine and radiator  
are hot. Scalding hot coolant  
and steam may blow out under  
7
Radiator coolant can severely  
obscure  
visibility  
when  
pressure  
injury.  
causing  
serious  
sprayed on the windshield  
and may cause loss of vehicle  
control or damage to paint  
and body trim.  
7-33  

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