2021 HYUNDAI TUCSON HYBRID engine overheat

01
1-23
NOTICE
• When the vehicle is paint baked, do
not bake over 30 minutes in 158°F
(70°C) or 20 minutes in 176°F (80°C)
degree.
• Do not wash the engine
compartment, using water. Water
may cause an electric shock and
damage the electronic components.
WARNING
This hybrid vehicle uses the hybrid
battery system inverter and converter
to generate high voltage. High voltage
in the hybrid battery system is very
dangerous and may cause severe burns
and electric shock. This may result in
serious injury or death.
• For your safety, never touch,
replace, disassemble or remove the
hybrid battery system including
components, cables and connectors.
Severe burns or electric shock may
result in serious injury or death when
you fail to follow this warning.
• When the hybrid battery system
operates, the hybrid battery system
can be hot. Always be careful
because burns or electric shock may
be caused by high voltage.
• Do not spill liquid on the HPCU, HSG,
motor and fuses. If the hybrid system
components come in contact with
liquid, it may result in electric shock.
Service interlock connector
ONX4HQ010013
In case of emergency, cut the service
interlock connector cable to isolate the
high voltage of the battery.
WARNING
Never disconnect the service interlock
connector or cut the wire except in an
emergency situation.
Serious problems may occur, such as
the vehicle will not start.
Hybrid battery cooling duct
ONX4HQ010014
The hybrid battery cooling duct is
located of the Passenger’s seat. The
cooling duct cools down the hybrid
battery. When the hybrid battery cooling
duct is blocked, the hybrid battery may
be overheated.
Clean the cooling duct for the hybrid
battery with a dry cloth on a regular
basis.

Immobilizer indicator light (with smart key) ..........................................................4-20
Downhill Brake Control (DBC) indicator light ........................................................4-20
Turn signal indicator light ........................................................................\
.................4-21
High beam indicator light ........................................................................\
................4-21
Low beam indicator light ........................................................................\
.................4-21
Light ON indicator light ........................................................................\
....................4-21
High Beam Assist indicator light ........................................................................\
......4-21
Cruise indicator light ........................................................................\
.......................4-21
SPORT Mode indicator light ........................................................................\
............4-22
ECO Mode indicator light ........................................................................\
................4-22
SMART Mode indicator light ........................................................................\
...........4-22
LCD display messages ........................................................................\
.......................4-22
Shift to P ........................................................................\
...........................................4-22
Low key battery ........................................................................\
................................4-22
Press START button while turning wheel ...............................................................4-22
Check steering wheel lock system ........................................................................\
.4-22
Press brake pedal to start engine ........................................................................\
...4-23
Key not in vehicle ........................................................................\
.............................4-23
Key not detected ........................................................................\
..............................4-23
Press START button again ........................................................................\
...............4-23
Press START button with key ........................................................................\
...........4-23
Check BRAKE SWITCH fuse
........................................................................\
............4-23
12V battery discharging due to additional electrical devices ...............................4-23
Door, Hood, Liftgate open indicator .......................................................................4-24
Sunroof open indicator ........................................................................\
....................4-24
Low pressure ........................................................................\
....................................4-24
Wiper/Lights display ........................................................................\
........................4-25
Low washer fluid ........................................................................\
..............................4-25
Low fuel ........................................................................\
............................................4-25
Engine has overheated ........................................................................\
....................4-25
Check exhaust system ........................................................................\
.....................4-25
Check headlight ........................................................................\
...............................4-25
Check turn signal ........................................................................\
.............................4-25
Check brake light ........................................................................\
.............................4-25
Check headlamp LED ........................................................................\
......................4-26
Check Active Air Flap system ........................................................................\
..........4-26
Ready to start driving ........................................................................\
......................4-26
Check regenerative brakes ........................................................................\
.............. 4-26
Stop vehicle and check brakes
........................................................................\
.......4-26
Check Hybrid system ........................................................................\
.......................4-26
Stop safely and check Hybrid system ....................................................................4-26
Check Hybrid system. Do not start engine ............................................................4-26
4

04
4-25
Wiper/Lights display
„„Wiper„„Lights
OJX1049008LOJX1049007L
• This indicator displays which wiper
speed is selected using the wiper
control.
• This indicator displays which exterior
light is selected using the lighting
control.
You can activate or deactivate Wiper/
Lights display function from the User
Settings menu in the cluster LCD display.
- Setup → User settings → Cluster →
Wiper/Lights display
Low washer fluid (if equipped)
This message is displayed if the washer
fluid level in the reservoir is nearly empty.
Have the washer fluid reservoir refilled.
Low fuel
This message is displayed if the fuel tank
is almost out of fuel.
When this message is displayed, the low
fuel level warning light in the cluster will
come on.
It is recommended to look for the nearest
fueling station and refuel as soon as
possible.
NOTICE
Do not drive the vehicle with low fuel.
Hybrid battery damage may occur
when the fuel tank is completely empty.
Engine has overheated
This message is displayed when the
engine coolant temperature is above
248°F (120°C). This means that the
engine is overheated and may be
damaged.
If your vehicle is overheated, refer to
“Overheating” section in chapter 8.
Check exhaust system (if equipped)
This message is displayed if there is a
problem with the GPF system. At this
time, the GPF warning light will also
blink. If this occurs, we recommend that
you have the GPF system checked by an
authorized HYUNDAI dealer.
GPF : Gasoline Particulate Filter
Check headlight (if equipped)
This message is displayed if the
headlights are not operating properly. A
headlight bulb may need to be replaced.
Make sure to replace the burned out
bulb with a new one of the same wattage
rating.
Check turn signal (if equipped)
This message is displayed if the turn
signal lamps are not operating properly.
A lamp may need to be replaced.
Make sure to replace the burned out
bulb with a new one of the same wattage
rating.
Check brake light (if equipped)
This message is displayed if the stop
lamps are not operating properly. A lamp
may need to be replaced.
Make sure to replace the burned out
bulb with a new one of the same wattage
rating.

Instrument cluster
4-32
ONX4E040023
Tire Pressure
This mode displays information related to
Tire Pressure.
For more details, refer to "Tire Pressure
Monitoring System (TPMS)" in chapter
8.
Engine coolant temperature
OTMH040014N
This engine coolant temperature gauge
display shows the temperature of the
engine coolant when the engine is
running.
NOTICE
When the gauge indicator gets out of
the normal range, toward the "H(Hot)"
position, it indicates overheating of the
engine. It may damage the engine.
Do not continue driving with the
overheated engine.
For more details, refer to "If the Engine
Overheats" section in the chapter 8.

05
5-73
Automatic reverse
ONX4050030
During power opening and closing if the
power liftgate is blocked by an object or
part of the body, the power liftgate will
detect the resistance.
• If the resistance is detected while
opening the liftgate, it will stop and
move in the opposite direction.
• If the resistance is detected while
closing the liftgate, it will stop and
move in the opposite direction.
However, if the resistance is weak such
as from an object that is thin or soft, or
the liftgate is near the latched position,
the automatic stop and reversal may not
detect the resistance. If the automatic
reversal feature operates continuously
more than twice during opening or
closing operation, the power liftgate may
stop at that position. At this time, close
the liftgate manually and operate the
liftgate automatically again.
WARNING
Never intentionally place any object
or part of your body in the path of
the power liftgate to make sure the
automatic reverse function operates.
NOTICE
Do not put heavy objects on the power
liftgate before you operate the power
liftgate. Additional weight may damage
the operation of the system.
Non-operating conditions of the
power liftgate
• The power liftgate does not open
when the vehicle is in motion.
The chime will sound if you drive
over 2mph (3km/h) with the
liftgate opened. Stop your vehicle
immediately at a safe place and check
if your liftgate is opened.
• Operating the power liftgate more
than 5 times continuously could
cause damage to the operating motor.
If this occurs, the power liftgate
system enters into thermal protection
mode to prevent the motor from
overheating. In thermal protection
mode, the power liftgate will not
operate. If any of the power liftgate
buttons are pressed to try to open the
liftgate, the chime will sound 3 times
but the liftgate will not operate.
Allow the power liftgate system
to cool for about 1 minute before
operating the system again.
• The power liftgate can be operated
when the engine is not running.
However the power liftgate operation
consumes large amounts of vehicle
electric power. To prevent the battery
from being discharged, do not
operate it excessively e.g.: more than
approximately 10 times repeatedly.
• To prevent the battery from being
discharged, do not leave the power
liftgate in the open position for a long
lime.
• When jacking up the vehicle to
change a tire or repair the vehicle, do
not operate the power liftgate. This
could cause the power liftgate to
operate improperly.
• In cold and wet climates, the power
liftgate may not work properly due to
freezing conditions.

05
5-107
Air conditioning
HYUNDAI Air Conditioning Systems are
filled with R-1234yf refrigerant.
1.
Start the engine. Push the air
conditioning butt
on.
2.
Set the mode t

o the
position.
3.
Set the air in

take control to the
outside air or recirculated air position.
4.
Adjus

t the fan speed control and
temperature control to maintain
maximum comfort.
Information
ONX4050071
Your HYUNDAI vehicle is filled with
R-1234-yf refrigerant. Information
regarding the refrigerant designation
for your vehicle can be found on the
information label located under the hood.
Refer to chapter 8 for the location of the
air conditioning refrigerant label.
NOTICE
• The refrigerant system should only
be serviced by trained and certified
technicians to insure proper and safe
operation.
• The refrigerant system should be
serviced in a well-ventilated place.
• The air conditioning evaporator
(cooling coil) shall never be repaired
or replaced with one removed from
a used or salvaged vehicle and new
replacement MAC evaporators shall
be certified (and labeled) as meeting
SAE Standard J2842.
NOTICE
• When using the air conditioning
system, monitor the temperature
gauge closely while driving up
hills or in heavy traffic when
outside temperatures are high.
Air conditioning system operation
may cause engine overheating.
Continue to use the fan but turn the
air conditioning system off if the
temperature gauge indicates engine
overheating.
• When opening the windows in humid
weather air conditioning may create
water droplets inside the vehicle.
Since excessive water droplets
may cause damage to electrical
equipment, air conditioning should
only be used with the windows
closed.

05
5-119
CAUTION
To prevent damage to the power
outlets:
• Use the power outlet only when the
engine is running and remove the
accessory plug after use. Using the
accessory plug for prolonged periods
of time with the engine off could
cause the battery to discharge.
• Only use 12 volts electric accessories
which are less than 180 watts in
electric capacity.
• Adjust the air-conditioner or heater
to the lowest operating level when
using the power outlet.
• Close the cover when not in use.
• Some electronic devices can
cause electronic interference
when plugged into a vehicle’s
power outlet. These devices may
cause excessive audio static and
malfunctions in other electronic
systems or devices used in your
vehicle.
• Push the plug in as far as it will go. If
good contact is not made, the plug
may overheat and the fuse may open.
• Plug in battery equipped electrical/
electronic devices with reverse
current protection. The current
from the battery may flow into the
vehicle’s electrical/electronic system
and cause system malfunction.
USB charger
„„Front
ONX4050053
„„Rear
ONX4050054
The USB charger is designed to recharge
batteries of small size electrical devices
using a USB cable.
The electrical devices can be recharged
when the Engine Start/Stop button is in
the ACC or ON (or START) position.
The battery charging state may be
monitored on the electrical device.

Driving your vehicle
6-16
5. When the message ‘Vehicle will stay in
(N). Change gear to cancel’ (or ‘N will
stay engaged when the vehicle is Off’)
appears on the cluster LCD display,
press the Engine Start/Stop button
while depressing the brake pedal.
However, if you open the driver’s or
front passenger’s door, the gear will
automatically shift to P (Park) and the
Engine Start/ Stop button will change to
the OFF position.
When the battery is discharged:
You cannot shift the shift button, when
the battery is discharged.
In emergencies, do the following to
move the shift button to N (Neutral) on a
level ground.
1.
Connect the batt

ery cables from
another vehicle or from another
battery.
For more details, refer to “Jump
Starting” in chapter 8.
2.
Release the parking br

ake with the
Engine Start/Stop button in the ON
position.
3.
Shift the gear to the N(N

eutral)
position refer to the “Stay in Neutral
when vehicle is Off” in this chapter.
Parking
Always come to a complete stop and
continue to depress the brake pedal.
Move the shift button into the P (Park)
position, apply the parking brake, and
place the ignition switch in the LOCK/
OFF position. Take the Key with you
when exiting the vehicle.
• The gear is shifted to P (Park) position
automatically for safety under the
following conditions.
- When the driver un

fasten the seat
belt and open the driver’s door in
the “Stay in Neutral when vehicle is
Off” condition or in the ignition ON
- When turn off the engine with R (R

everse) / D (Drive) or N (Neutral)
position
This is supplemental function for safety.
Always check the P (Park) position is
shifted.
WARNING
When you stay in the vehicle with
the engine running, be careful not to
depress the accelerator pedal for a long
period of time. The engine or exhaust
system may overheat and start a fire.
The exhaust gas and the exhaust system
are very hot. Keep away from the
exhaust system components.
Do not stop or park over flammable
materials, such as dry grass, paper or
leaves. They may ignite and cause a fire.