HYUNDAI NEXO 2023 Owners Manual

Stack cooling coolant
When adding stack coolingcoolant, use only exclusive coolant
for fuel cell stack in authorized
HYUNDAI dealer and never mix
any water or liquid.
An improper coolant mixture can result in severe malfunction or
electric devices damage.
If the vehicle is damaged by adding unspecified liquid except exclusive
coolant for fuel cell stack, it will not
be covered by the warranty.
7-17
7
Maintenance
Never remove the
radiator cap or the drain plug while the
radiator is hot. Hotcoolant and steam
may blow out under pressure,
causing serious injury.
WARNING
OFE078006 Turn the vehicle off and wait
until the parts in the fuel cell
power module compartment
cools down. Use extreme care
when removing the 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 aresure all the pressure has been
released, press down on the
cap, using a thick towel, and
continue turning counterclock-
wise to remove it.

The electric motor for the cooling fan
is controlled by coolant temperature,
refrigerant pressure and vehicle
speed. As the coolant temperature
decreases, the electric motor will
automatically shut off. This is a nor-mal condition.
Changing Coolant
For the fuel cell stack, an exclusive
coolant must be used . When chang-
ing the fuel cell stack coolant, werecommend that coolant be changed
by an authorized HYUNDAI dealeraccording to the MaintenanceSchedule at the beginning of this
chapter.To prevent damage to parts in the
fuel cell power module compart-
ment, put a thick towel around the
coolant cap before refilling the
coolant to prevent the coolant
from overflowing into parts in the
fuel cell power module compart-ment.
NOTICE
7-18
Maintenance
The electric motor for
the cooling fan may
continue to operate
or start up when the
vehicle is not running
and can cause serious injury.
Keep hands, clothing and tools
away from the rotating fan
blades of the cooling fan.
WARNING
Do not use coolant or antifreeze
in the washer fluid reservoir.
Coolant can severely obscure
visibility when sprayed on the
windshield and may cause loss
of vehicle control resulting in anaccident.
Coolant may also cause dam-
age to paint and body trim.
WARNING
Do not mix-up the caps of
device cooling coolant and
stack cooling coolant because
the fluid material is different. If
the cap is mixed, the fuel cell
system may be damage.
We recommend that you con-
sult an authorized HYUNDAI
dealer.
CAUTION

7-19
7
Maintenance
BBRRAA KKEE FF LLUU IIDD
Checking the Brake Fluid
Level
Check the fluid level in the reservoir
periodically. The fluid level should be
between MAX and MIN marks on the
side of the reservoir.
Before removing the reservoir cap
and adding brake fluid, clean the
area around the reservoir cap thor-
oughly to prevent brake fluid contam-ination. If the level is low, add the specified
brake fluid to the MAX level. The level
will fall with accumulated mileage.
This is a normal condition associated
with the wear of the brake linings. If
the fluid level is excessively low, have
the brake system checked by an
authorized HYUNDAI dealer.
Do not allow brake fluid to con-
tact the vehicle’s body paint, as
paint damage will result.
Brake fluid, which has been exposed to open air for an
extended time should NEVER beused as its quality cannot be
guaranteed. It should be dis-
posed of properly.
Do not use the wrong kind of brake fluid. A few drops of min-
eral based oil, such as engine
oil, in your brake system can
damage brake system parts.
Information
Use only the specified brake fluid
(refer to "Recommended Lubricants
and Capacities" in chapter 8).
i
NOTICE
If the brake system requires fre-
quent additions of fluid thiscould indicate a leak in the
brake system. Have the vehicle
inspected by an authorized
HYUNDAI dealer.
WARNING
Do not allow brake fluid to come
in contact with your eyes. Ifbrake fluid comes in contact
with your eyes, flush your eyes
with clean water for at least 15
minutes and get immediatemedical attention.
WARNING
OFE078007

7-20
MaintenanceW
W AASSHH EERR FF LLUU IIDD
Checking the Washer Fluid
Level
Check the fluid level in the washer
fluid reservoir and add fluid if neces-
sary. Plain water may be used if
washer fluid is not available.
However, use washer solvent with
antifreeze characteristics in cold cli-
mates to prevent freezing.
Filter Replacement
Faulty air cleaner filter has a direct
influence on reduction of the stack
output, etc. Replace the filter accord-
ing to the maintenance schedule.
OFE078008 To prevent serious injury or
death, take the following safetyprecautions when using washerfluid:
Do not use coolant or
antifreeze in the washer fluid
reservoir.
Coolant can severely obscure
visibility when sprayed on the
windshield and may cause
loss of vehicle control result-
ing in an accident or damage
to paint and body trim.
Do not allow sparks or flame to contact the washer fluid or
the washer fluid reservoir.
Washer fluid may containalcohol and can be flamma-
ble.
Do not drink washer fluid and
avoid contact with skin.
Washer fluid is harmful tohumans and animals.
Keep washer fluid away from
children and animals.
WARNING
AA
IIRR CC LLEE AA NN EERR

1. Loosen the air cleaner coverattaching clips and open the
cover. 2. Wipe the inside of the air cleaner.
3. Replace the air cleaner filter.
4. Lock the cover with the cover
attaching clips.
5. Check that the cover is firmly installed. Information
If the vehicle is operated in extremely
dusty or sandy areas, replace the air
cleaner filter more often than the
usual recommended intervals (refer to
"Maintenance Under Severe Usage
Conditions" in this chapter).
i
7-21
7
Maintenance
OFE078010OFE078009Do not drive with the air clean-
er filter removed. This will
result in excessive wear.
When removing the air clean-
er filter, be careful that dust or
dirt does not enter the air
intake, or damage may result.
Use HYUNDAI genuine parts,
use of non-genuine parts
could damage the air flow
sensor.
CAUTION

7-22
MaintenanceC
C LLIIMM AATTEE CC OO NNTTRR OO LL AA IIRR FF IILL TT EERR
Filter Inspection
The climate control air filter should be replaced according to the
Maintenance Schedule. If the vehicle
is operated in severely air-polluted
cities or on dusty rough roads for a
long period, it should be inspected
more frequently and replaced earlier.
When you replace the climate control
air filter, replace it performing the fol-
lowing procedure, and be careful to
avoid damaging other components.
1. With the glove box open, removethe stoppers on both sides to allow
the glove box to hang freely on the
hinges. 2. Remove the support rod (1).
OFE078011OFE078012

7-23
7
Maintenance
3. Press and hold the lock (1) on leftside of the cover.
4. Pull out (2) the cover. 5. Replace the climate control air fil-
ter.
6. Reassemble in the reverse order of disassembly. Install a new climate control air fil- ter in the correct direction with the
arrow symbol (

) facing down-
wards. Otherwise, the climate con-
trol effects may decrease, possi-
bly with a noise.
NOTICE
OHG075041OFE078013

7-24
MaintenanceW
W IIPP EERR BB LLAA DDEESS
Blade Inspection
Contamination of either the wind-
shield or the wiper blades with for-
eign matter can reduce the effective-ness of the windshield wiper func-
tionality. Common sources of con-
tamination are insects, tree sap, and
hot wax treatments used by some
commercial car washes. If the blades
are not wiping properly, clean both
the window and the blades with a
clean cloth dampened with washerfluid.
To prevent damage to the wiper
blades, arms or other compo-
nents, do not:
Use gasoline, kerosene, paint
thinner, or other solvents on or near them.
Attempt to move the wipers manually.
Use non-specified wiper blades. Information
Commercial hot waxes applied by
automatic car washes have been
known to make the windshield diffi-
cult to clean.
Blade Replacement
When the wipers no longer clean
adequately, the blades may be worn
or cracked, and require replacement.
To prevent damage to the wiper
arms or other components, do not
attempt to move the wipers manu-
ally. The use of a non-specified wiper
blade could result in wiper mal-
function and failure.
Front windshield wiper service positions
This vehicle has a "hidden" wiperdesign which means that the wipers
cannot be lifted when they are intheir bottom resting position.
1. Within 20 seconds of turning off the vehicle, lift and hold the wiper
lever up to the MIST position forabout 2 seconds until the wipers
move to the top wipe position.
2. At this time you can lift the wipers off the windshield.
3. Gently put the wipers back down onto the windshield.
4. Turn the wipers to any ON position to return the wipers to the bottomresting position.
NOTICE
NOTICE
i
NOTICEOFE078038N

7-25
7
Maintenance
Front windshield wiper bladereplacement
1. Raise the wiper arm.
2. Lift up the wiper blade clip (1).Then pull down the blade assem-
bly (2) and remove it. 3. Install the new blade assembly in
the reverse order of removal.
4. Return the wiper arm on the wind- shield.
To prevent damage to the wiperarms or other components,
have an authorized HYUNDAI
dealer replace the wiper blade.
CAUTION
OLMB073098
OLMB073099
OLMB073100

7-26
Maintenance
Rear window wiper bladereplacement
1. Operate the rear windshield wiper to make sure the blade is on lower
position. Then turn off the vehicle. 2. Raise the wiper arm (1) and pull
out the wiper blade assembly. 3. Install the new blade assembly by
inserting the center part into the
slot in the wiper arm until it clicks
into place.
4. Make sure the blade assembly is installed firmly by trying to pull it
slightly.
To prevent damage to the wiper arms
or other components, we recom-
mend that the wiper blades be
replaced by an authorized HYUNDAI
dealer.
OFE078016
OFE078014OFE078015