Maintenance
9-24
ENGINE COOLANT/INVERTER 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
 Engine coolant
ONX4H090004
 Inverter coolant
ONX4H090005
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.
ś Engine coolant /
Inverter coolant for HEV
- If the coolant level is low, add the
selected anti-freeze according to
the proper coolant mix ratio to bring
the level to the MAX mark, but do
not overfill.
ś Inverter coolant for PHEV
- If the inverter coolant level for
the PHEV is low, we recommend
that it be refilled by an authorized
HYUNDAI dealer/service partner.
If frequent additions are required, we
recommend that you see an authorized
HYUNDAI dealer for a cooling system
inspection.
 Engine coolant cap
ONX4H090006
 Inverter coolant cap
ONX4H090007
WARNING - Inverter coolant
for PHEV
Adding other cooling substances or
water might lead to inverter cooling
system degradation or even failure.
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