2021 HYUNDAI NEXO maintenance schedule

7-12
Maintenance
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Cooling System
Check cooling system components,
such as radiator, coolant reservoir,
hoses and connections for leakage
and damage. Replace any damaged
parts.
Coolant
The coolant should be changed at
the intervals specified in the mainte-
nance schedule.
Reduction Gear Fluid
Inspect the reduction gear fluid
according to the maintenance sched-
ule.
Brake Hoses and Lines
Visually check for proper installation,
chafing, cracks, deterioration and
any leakage. Replace any deteriorat-
ed or damaged parts immediately.
Brake Fluid
Check brake fluid level in the brake
fluid reservoir. The level should be
between the MIN and the MAX
marks on the side of the reservoir.
Use only hydraulic brake fluid con-
forming to DOT 3 or DOT 4 specifi-
cation.
Brake Discs, Pads, Calipers
and Rotors
Check the pads for excessive wear,
discs for run out and wear, and
calipers for fluid leakage.
Suspension Mounting Bolts
Check the suspension connections
for looseness or damage. Retighten
to the specified torque.
Steering Gear Box, Linkage &
Boots/Lower Arm Ball Joint
With the vehicle stopped and the
vehicle off, check for excessive free-
play in the steering wheel. Check the
linkage for bends or damage. Check
the dust boots and ball joints for
deterioration, cracks, or damage.
Replace any damaged parts.
Drive Shafts and Boots
Check the drive shafts, boots and
clamps for cracks, deterioration, or
damage. Replace any damaged
parts and, if necessary, repack the
grease.
Air Conditioning Refrigerant
Check the air conditioning lines and
connections for leakage and dam-
age.

7-15
7
MaintenanceThe 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
Have coolant changed by an author-
ized HYUNDAI dealer according to
the Maintenance Schedule 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
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 an
accident.
Coolant may also cause dam-
age to paint and body trim.
WARNING

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, we
recommend that coolant be changed
by an authorized HYUNDAI dealer
according to the Maintenance
Schedule 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 an
accident.
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

7-20
Maintenance
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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 safety
precautions when using washer
fluid:
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 contain
alcohol and can be flamma-
ble.
Do not drink washer fluid and
avoid contact with skin.
Washer fluid is harmful to
humans and animals.
Keep washer fluid away from
children and animals.
WARNING
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7-22
Maintenance
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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

I-4
Driver Assist System.....................................................3-105
Parking Distance Warning (Reverse/Forward)
System ...................................................................3-105
Rear View Monitor ...................................................3-109
Surround View Monitoring ......................................3-110
Driver Attention Warning (DAW) System......................5-94
System Setting and Activation ...................................5-94
Resetting the System ..................................................5-95
System Standby ..........................................................5-96
System Malfunction ...................................................5-96
Electric Power Steering (EPS) ........................................3-20
Electronic Parking Brake (EPB) .....................................5-19
Electronic Stability Control (ESC) .................................5-31
Emergency Fuel Filler Door Release..............................3-57
Explanation of scheduled maintenance items.................7-12
Exterior Care ...................................................................7-62
Exterior Features .............................................................3-42
Hood ...........................................................................3-42
Non-Powered Liftgate ................................................3-43
Power Liftgate ............................................................3-45
Smart Liftgate.............................................................3-51
Fuel Filler Door ..........................................................3-55
Emergency Fuel Filler Door Release .........................3-57Exterior Features ...........................................................3-176
Roof Side Rails ........................................................3-176
Exterior Lights ................................................................3-89
Exterior Overview.............................................................1-2
Features of FCEV............................................................H10
How to Start the Vehicle .............................................H10
How to Stop the Vehicle .............................................H11
Virtual Engine Sound System .....................................H11
Fuel filler door ............................................................H12
Warning and indicator lights.......................................H15
LCD Display Messages ..............................................H16
FCEV mode ................................................................H21
When the high voltage battery is weak ......................H25
If the 12 volt battery is discharged .............................H25
Emergency while driving............................................H26
Floor Mat Anchor(s) .....................................................3-172
Forward Collision-avoidance Assist (FCA) System.......5-39
System Setting and Activation ...................................5-39
FCA Warning Message and System Control..............5-41
FCA Sensor (Front Radar/Front View Camera).........5-44
System Malfunction ...................................................5-46
Limitations of the System ..........................................5-47
Index
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I-7
Lighting ...........................................................................3-89
Exterior Lights............................................................3-89
Welcome System ........................................................3-99
Luggage Net Holder .....................................................3-172
Maintenance services ........................................................7-4
Owner's Responsibility.................................................7-4
Owner Maintenance Precautions..................................7-4
Mirrors ............................................................................3-23
Inside Rearview Mirror ..............................................3-23
Side View Mirrors ......................................................3-31
Motor Number ..................................................................8-8
Multimedia system............................................................4-2
USB and iPod
®port .....................................................4-2
Antenna ........................................................................4-2
Steering wheel audio controls ......................................4-3
Bluetooth
®Wireless Technology..................................4-4
Audio/Video/Navigation system (AVN) ......................4-4
Non-Powered Liftgate.....................................................3-43Occupant Classification System (OCS)..........................2-58
Owner maintenance ..........................................................7-5
Owner maintenance schedule .......................................7-6
Paddle Shifter (Regenerative Braking Control) .............5-17
Parking Distance Warning (Reverse/Forward)
System .......................................................................3-105
Power Brakes ..................................................................5-18
Power Button ....................................................................5-6
POWER Button Positions ............................................5-7
Starting the Vehicle ......................................................5-9
Turning Off the Vehicle..............................................5-10
Power Liftgate.................................................................3-45
Power Outlet .................................................................3-166
Rear Cross-traffic Collision Warning (RCCW)/
Rear Cross-traffic Collision-avoidance Assist
(RCCA)........................................................................5-67
System Description ....................................................5-67
System Setting and Activation ...................................5-68
Warning and System Control .....................................5-69
Limitations of the System ..........................................5-73
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I-8
Rear Seats .......................................................................2-10
Rear View Monitor .......................................................3-109
Rear Window Wiper and Washer..................................3-104
Recommended Lubricants and Capacities ........................8-6
Reducing the Risk of a Rollover ..................................5-121
Reduction Gear ...............................................................5-11
Reduction Gear Operation ..........................................5-11
Parking........................................................................5-13
LCD Display Messages ..............................................5-13
Good Driving Practices ..............................................5-16
Refrigerant Label ..............................................................8-8
Remote Smart Parking Assist (RSPA) ..........................3-113
Operating Condition .................................................3-114
Non-operating Condition ..........................................3-115
Limitations of the System ........................................3-116
How the System Works (Smart Parking) .................3-120
How the System Works (Remote Smart Parking)....3-127
How the System Works (Smart Exit) .......................3-131
How the System Works
(Remote Moving Forward/Backward) ..................3-138
Additional Instructions (Messages)..........................3-143
Turn signal Showing Vehicle Status while System
in Activation ..........................................................3-144
Smart Key Showing Vehicle Status while System
in Activation ..........................................................3-145
Link with other Systems ..........................................3-146
Reporting Safety Defects ................................................8-10
Roof Side Rails .............................................................3-176Scheduled maintenance services.......................................7-7
Normal Maintenance Schedule ....................................7-8
Maintenance Under Severe Usage Conditions...........7-10
Seat Belt Restraint System .............................................2-24
Seat Belt Warning Light .................................................2-22
Seat Belts ........................................................................2-21
Seat Belt Safety Precautions ......................................2-21
Seat Belt Warning Light .............................................2-22
Seat Belt Restraint System .........................................2-24
Additional Seat Belt Safety Precautions ....................2-32
Care of Seat Belts .......................................................2-35
Seat Warmers and Air Ventilation Seats .........................2-17
Seats ..................................................................................2-4
Safety Precautions ........................................................2-5
Front Seats ....................................................................2-6
Rear Seats ...................................................................2-10
Head Restraints ..........................................................2-13
Seat Warmers and Air Ventilation Seats.....................2-17
Side View Mirrors...........................................................3-31
Smart Cruise Control With Stop & Go System ..............5-98
Smart Cruise Control Switch .....................................5-99
To Adjust the Sensitivity of Smart Cruise Control ..5-100
To Convert to Cruise Control Mode ........................5-100
Smart Cruise Control Speed .....................................5-101
Index
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