2023 HYUNDAI NEXO cooling

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Your vehicle at a glanceF
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1. Brake fluid reservoir ..........................7-19
2. Air cleaner.........................................7-20
3. Fuse box ...........................................7-53
4. Windshield washer fluid reservoir .....7-20
5. Device cooling coolant reservoir .......7-13
6. Device cooling radiator cap ..............7-14
7. Stack cooling coolant reservoir.........7-16
8. Stack cooling radiator cap ................7-17
OFE078001
The actual Fuel cell power module compartment in the vehicle may differ from the illustration.

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Convenient features of your vehicle
Automatic Temperature
Control Mode
The Automatic Climate Control
System is controlled by setting the
desired temperature.
1. Press the AUTO button (7).The modes, fan speeds, air intake and air-conditioning will be con-
trolled automatically by the tem-
perature setting you select.
2. Press the temperature control but- ton (1,2) to the desired tempera-
ture. If the temperature is set to
the lowest setting (Lo), the air con-
ditioning system will operate con-
tinuously. After the interior has
cooled sufficiently, adjust the but-
ton to a proper temperature set
point whenever possible.
To turn the automatic operation off,
select any button of the following:
- Mode selection button
- Front windshield defroster button (Press the button one more time to deselect the front windshield
defroster function. The 'AUTO' sign
will illuminate on the information
display once again.) - Fan speed control button The selected function will be con-
trolled manually while other functions
operate automatically.
For your convenience and to improve the efficiency of the climate control,
use the AUTO button and set the
temperature to 22°C (72°F).
Never place anything near the ambient light/solar sensor to
ensure better control of the heat-ing and cooling system.
Manual Temperature Control Mode
The heating and cooling system can
be controlled manually by pushing
buttons other than the AUTO button.
In this case, the system workssequentially according to the order of
buttons selected.
When pressing any button except the
AUTO button while using automatic
operation, the functions not selected
will be controlled automatically.
1. Start the vehicle.
2. Set the mode to the desired posi-
tion.
To improve the effectiveness of heating and cooling, select the
mode according to the following:
- Heating: - Cooling:
3. Set the temperature control to the desired position.
4. Set the air intake control to Fresh mode or Recirculation mode posi- tion.
5. Set the fan speed control to the desired speed.
NOTICE
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Convenient features of your vehicle
Driver only
If you press the DRIVER ONLY but-
ton( ) and the indicator light
illuminates, cold air mostly blows in
the direction of the driver's seating
position. However, some of the cold
air may be vented out of other seat-
ing position ducts to keep indoor airpleasant.
If you use the button with no passen- ger in the front passenger seat, ener-
gy consumption may be reduced.
DRIVER ONLY button will be turned
off under the following conditions:
1) Defrost on (the DRIVER ONLYbutton indicator is not turned off)
2) DRIVER ONLY button re-push
System Operation
Cooling / Ventilation
1. Select the Face Level mode.
2. Set the air intake control to fresh mode.
3. Set the temperature control to the desired position.
4. Set the fan speed control to the desired speed.
Heating
1. Select the Floor Level mode.
2. Set the air intake control to freshmode.
3. Set the temperature control to the desired position.
4. Set the fan speed control to the desired speed.
5. If desired, turn the air conditioning ON with the temperature control knob set to heat in order to dehu-
midify the air before it enters intothe cabin.
If the windshield fogs up, select the
Floor & Defrost mode or press
the Front Defrost mode.
Operation Tips
If dust or unpleasant fumes are entering the car through the venti-
lation system, temporarily set the
air intake control to the recircula-
tion mode. Return the control to thefresh mode when the unpleasant
air outside has diminished. This will
help keep the driver alert and com-
fortable.
To help prevent the inside of the windshield from fogging, set the air
intake control to fresh mode and
the fan speed to the desired posi-
tion, turn on the air conditioning
system, and adjust the temperature
control to the desired temperature.
DRIVER ONLY
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Convenient features of your vehicle
3
Air conditioning
Your HYUNDAI vehicle air condition- ing system is filled with R-1234yf
refrigerant.
1. Start the vehicle.
2. Press the air conditioning button.
3. Select the Face Level mode.
4. Set the air intake control toRecirculation mode temporarily to
allow the cabin to cool quickly.
When the desired temperature inthe cabin is reached, change the
air intake control back to Fresh
mode.
5. Adjust the fan speed control and temperature control to maintain
maximum comfort.
When maximum cooling is desired,
set the temperature control to the
MAX A/C position, then set the fanspeed control to the highest setting. When using the air conditioning
system, monitor the temperature
gauge closely while driving up
hills or in heavy traffic when out-
side temperatures. Air condition-
ing system operation when climb-ing a steep grade or in high out-side ambient temperatures can
cause fuel cell stack overheating.
Continue to use the fan, but turn the air conditioning system off if
the temperature gauge indicates
fuel cell stack overheating.
Air conditioning system operation
tips
If the vehicle has been parked in
direct sunlight during hot weather,
open the windows for a short time
to let the hot air inside the vehicle
escape.
After sufficient cooling has been achieved, switch back from recircu-
lation mode to fresh mode. To help reduce moisture inside of
the windows on rainy or humid
days, decrease the humidity inside
the vehicle by operating the airconditioning system with the win-
dows and sunroof closed.
Use the air conditioning system every month only for a few minutes
to ensure maximum system per-
formance.
If you operate air conditioner exces- sively, the difference between the
temperature of the outside air andthat of the windshield could cause
the outer surface of the windshield
to fog up, causing loss of visibility. In
this case, set the mode selection
knob or button to the position
and fan speed control to the lowerspeed.
NOTICE

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Convenient features of your vehicleW
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For maximum defrost perform-
ance, set the temperature control
to the highest temperature setting
and the fan speed control to thehighest setting.
If warm air to the floor is desired while defrosting or defogging, set themode to the floor-defrost position.
Before driving, clear all snow and ice from the windshield, rear win-
dow, side view mirrors, and all side
windows.
Clear all snow and ice from the hood and air inlet in the cowl grill to
improve heater and defroster effi-ciency and to reduce the probability
of fogging up the inside of the wind-shield.Automatic Temperature Control
System
To defog inside windshield
1. Select the desired fan speed.
2. Select the desired temperature.
3. Press the defroster button ( ).
4. Fresh mode will be selected auto- matically.
Check to make sure the air intake
control is in Fresh mode. If the air
intake control LED is illuminated,
press the button once to enable
Fresh mode (LED OFF).
If the position is selected, the fan speed is automatically increased.
Windshield heating
Do not use the or posi- tion during cooling operation in
extremely humid weather. The
difference between the temper-ature of the outside air and thatof the windshield could causethe outer surface of the wind-
shield to fog up, causing loss ofvisibility could cause an acci-
dent resulting in serious injury
or death. In this case, set the
mode selection knob or button
to the position and fan
speed control knob or button to
a lower speed.
WARNING
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Driving your vehicle
ECO+ mode
ECO+ mode improves
fuel efficiency with ultra
power saving driving
mode.
When ECO+ mode is selected by pressing and holding the DRIVE
MODE button, the ECO+ indicator
will illuminate.
Distance to empty may not change when the air conditioner/heater
system is off. However, actual dis-
tance may be extended.
Air conditioner/heater system turns off (except the defroster) but you
may turn it on if necessary.
When the drive mode is switched from the ECO+ mode to a different
mode, it is changed to air condi-
tioner/heater operation status of
the ECO mode.
Whenever the vehicle is restarted, the Drive Mode will reverse back to
NORMAL mode.
If ECO + mode is activated, the maximum vehicle speed is limited
below 100 km/h (60 mph).
Drive Mode Change Alert
The driver can select the Drive mode
change alert on the AVN screen.
Go to "Vehicle settings Drive
mode Drive mode change alert".
The information, which will be shown
whenever the drive mode ischanged.
Detailed alert : A change of the drive mode is shown by an
image of the vehicle.
Simple alert : A change of the drive mode is indicated by a
short message on topof the screen.
No alert : A change of the drive
mode is not indicated.
ECO Mode Climate Control
ECO Mode Climate Control helps
extend driving range by reducing the
heating and cooling power of the cli-mate control.
The driver can activate/deactivate
the system on the AVN screen.
Go to "Vehicle settings Drive
mode Eco mode climate control".
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Driving your vehicle
5
Winter Precautions
Use high quality ethylene glycolcoolant
Your vehicle is delivered with high
quality ethylene glycol coolant in the
cooling system. It is the only type ofcoolant that should be used because
it helps prevent corrosion in the cool-
ing system, lubricates the water
pump and prevents freezing. Be sure
to replace or replenish your coolantin accordance with the maintenance
schedule in chapter 7. Before winter,
have your coolant tested to assure
that its freezing point is sufficient for
the temperatures anticipated during
the winter.
Change to "winter weight" oil ifnecessary
In some climates it is recommended
that a lower viscosity "winter weight"
oil be used during cold weather. See
chapter 8 for recommendations. If
you aren't sure what weight oil you
should use, consult an authorized
HYUNDAI dealer.
Check battery and cables
Winter puts additional burdens on
the battery system. Visually inspect
the battery and cables as described
in chapter 7. The level of charge in
your battery can be checked by an
authorized HYUNDAI dealer or a
service station.
Use approved window washeranti-freeze in system
To keep the water in the window
washer system from freezing, add an
approved window washer anti-freeze
solution in accordance with instruc-
tions on the container. Window wash-
er anti-freeze is available from an
authorized HYUNDAI dealer and
most auto parts outlets. Do not use
coolant or other types of anti-freeze
as these may damage the paint fin-ish.
Do not let your parking brake
freeze
Under some conditions your parking
brake can freeze in the engaged
position. This is most likely to happen
when there is an accumulation of
snow or ice around or near the rear
brakes or if the brakes are wet. If
there is a risk the parking brake may
freeze, apply it only temporarily while
you shift to P (Park) and block therear wheels so the car cannot roll.
Then release the parking brake.

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Driving your vehicle
Do not let ice and snow accu-mulate underneath
Under some conditions, snow and
ice can build up under the fenders
and interfere with the steering. When
driving in severe winter conditions
where this may happen, you should
periodically check underneath the
car to be sure the movement of the
front wheels and the steering com-
ponents is not obstructed.
Don't place foreign objects ormaterials in the fuel cell power
module compartment
Placement of foreign object or mate-
rials which prevent cooling of the
vehicle, in the fuel cell power module
compartment, may cause a failure.
The manufacturer is not responsible
for the damage caused by suchplacement.
To keep locks from freezing
To keep the locks from freezing,
squirt an approved de-icer fluid or
glycerine into the key opening. If a
lock is covered with ice, squirt it with
an approved de-icing fluid to remove
the ice. If the lock is frozen internally,
you may be able to thaw it out by
using a heated key. Handle the heat-
ed key with care to avoid injury.