2023 HYUNDAI TUCSON HYBRID coolant temperature

01
1-63
Switching to Hybrid mode to allow
heating or air conditioning (Plug-in
hybrid vehicle)
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This message is displayed when the
vehicle automatically switches to
HEV mode to allow heating or air
conditioning. It is when the coolant
temperature is low (below -14°C) and the
driver turns on the heating or cooling
system.
If the coolant temperature gets higher
than -14°C or the driver turns off the
heating or cooling system the vehicle
returns to its default (EV) mode.
Maintaining Hybrid mode to allow
heating or air conditioning (Plug-in
hybrid vehicle)
OAEPHQ049841LOAEPHQ049841L
This message is displayed when the
vehicle maintains the HEV mode to allow
heating or air conditioning. The mode
does not change when the driver presses
the [HEV] button to switch from the HEV
mode to EV mode while the heating and
cooling system is on and the coolant
temperature is below -14°C.
Low/High System Temp. Maintaining
Hybrid mode (Plug-in hybrid vehicle)
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This message is displayed when the
temperature of the high-voltage
(hybrid) battery is too low or too high.
This warning message is to protect the
battery and the hybrid system.

04
4-31
Fuel door open (Plug-in hybrid
vehicle)
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This message is displayed when thefuel
filler door opens after the fuel tank
is depressurized. If this message is
displayed, you can refuel the fuel tank.
Shift to P to charge (Plug-in hybrid
vehicle)
OAEPHQ049833L
This message is displayed when the
charging connector is plugged with the
shift button in R (Reverse), N (Neutral)
or D (Drive). Move the shift button to P
(Park) and re-start the charging process.
Switching to Hybrid mode to allow
heating or air conditioning (Plug-in
hybrid vehicle)
OAEPHQ049842L
This message is displayed when the
vehicle automatically switches to
HEV mode to allow heating or air
conditioning. It is when the coolant
temperature is low (below -14°C) and the
driver turns on the heating or cooling
system.
If the coolant temperature gets higher
than -14°C or the driver turns off the
heating or cooling system the vehicle
returns to its default (EV) mode.

Instrument Cluster4-32
Maintaining Hybrid mode to allow
heating or air conditioning (Plug-in
hybrid vehicle)
OAEPHQ049841L
This message is displayed when the
vehicle maintains the HEV mode to allow
heating or air conditioning. The mode
does not change when the driver presses
the [HEV] button to switch from the HEV
mode to EV mode while the heating and
cooling system is on and the coolant
temperature is below -14°C.
Low/High System Temp. Maintaining
Hybrid mode (Plug-in hybrid vehicle)
OAEPHQ049834LOAEPHQ049835L
This message is displayed when the
temperature of the high-voltage
(hybrid) battery is too low or too high.
This warning message is to protect the
battery and the hybrid system.
Low/High System Temp. Switching
to Hybrid mode (Plug-in hybrid
vehicle)
OAEPHQ049836LOAEPHQ049837L
This message is displayed when the
temperature of the high-voltage (hybrid)
battery is too low or high. This warning
message is to protect the battery and the
hybrid system.

Instrument Cluster4-38
ONX4E040023
Tire Pressure
This mode displays information related to
Tir
e Pressure.
For more details, refer to "Tire Pressure
Monitoring System (TPMS)" in chapter
8.
Engine coolant temperature
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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.

06
6-55
Winter Precautions
Use high quality ethylene glycol coolant
Your vehicle is delivered with high
quality ethylene glycol coolant in the
cooling system. It is the only type of
coolant that should be used because it
helps prevent corrosion in the cooling
system, lubricates the water pump and
prevents freezing. Be sure to replace or
replenish your coolant in accordance
with the maintenance schedule in
chapter 9. Before winter, have your
coolant tested to assure that its freezing
point is sufficient for the temperatures
anticipated during the winter.
Check battery and cables
Winter temperatures affect battery
performance. Inspect the battery and
cables, as specified in chapter 9. The
battery charging level can be checked
by an authorized HYUNDAI dealer or in a
service station.
If the vehicle is not used for a long time,
park the vehicle indoors if possible.
Change to “winter weight” oil if
necessary
In some regions during winter, it is
recommended to use the “winter
weight” oil with lower viscosity In
addition, replace the engine oil and filter
if it is close to the next maintenance
interval. Fresh engine oil ensures
optimum engine operation during the
winter months. For further information,
refer to chapter 2. When you are not sure
about a type of winter weight oil, consult
an authorized HYUNDAI dealer.Check spark plugs and ignition system
Inspect the spark plugs, as specified in
chapter 9. If necessary, replace them.
Also check all ignition wirings and
components for any cracks, wear-out,
and damage.
To prevent locks from freezing
To prevent the locks from being frozen,
spray approved de-icing fluid or glycerin
into key holes. When a lock opening is
already covered with ice, spray approved
de-icing fluid over the ice to remove it.
When an internal part of a lock freezes,
try to thaw it with a heated key. Carefully
use the heated key to avoid an injury.
Use approved window washer anti-
freeze solution in system
To prevent the window washer from
being frozen, add authorized window
washer anti-freeze solution, as specified
on the window washer container.
Window washer anti-freeze solution is
available from an authorized HYUNDAI
dealer, and most vehicle accessory
outlets. Do not use engine coolant or
other types of anti-freeze solution, to
prevent any damage to the vehicle paint.

Driving Your Vehicle6-64
NOTICE
To prevent engine and/or transmission
overheating:

[ When towing a trailer on steep
grades (in excess of 6%) pay close
attention to the engine coolant
temperature gauge to ensure the
engine does not overheat. If the
needle of the coolant temperature
gauge moves towards “H” (HOT),
pull over and stop as soon as it is
safe to do so, and allow the engine
to idle until it cools down. You may
proceed once the engine has cooled
sufficiently.

[ If you tow a trailer with the maximum
gross vehicle weight and maximum
trailer weight, it can cause the
engine or transmission to overheat.
When driving in such conditions,
allow the engine to idle until it cools
down. You may proceed once the
engine or transmission has cooled
sufficiently.

[ When towing a trailer, your vehicle
speed may be much slower than the
general flow of traffic, especially
when climbing an uphill grade. Use
the right hand lane when towing a
trailer on an uphill grade. Choose
your vehicle speed according to the
maximum posted speed limit for
vehicles with trailers, the steepness
of the grade, and your trailer weight.
Parking on hills
Generally, if you have a trailer attached
to your vehicle, you should not park your
vehicle on a hill.
However, if you ever have to park your
trailer on a hill, here’s how to do it:
1. Pull the vehicle into the parking space.
Turn the steering wheel in the
direction of the curb (right if headed
down hill, left if headed up hill).
2. Shift the gear to P (Park).
3. Set the parking brake and shut off the vehicle.
4. Place wheel chocks under the trailer wheels on the down hill side of the
wheels.
5. Start the vehicle, hold the brakes, shift to neutral, release the parking brake
and slowly release the brakes until the
trailer chocks absorb the load.
6. Reapply the brakes and parking brakes.
7. Shift the gear to P (Park) when the vehicle is parked on a uphill grade and
in R (Reverse) on a downhill.
8. Shut off the vehicle and release the vehicle brakes but leave the parking
brake set.
WARNING
To prevent serious or fatal injury:

[Do not get out of the vehicle without
the parking brake firmly set. If you
have left the engine running, the
vehicle can move suddenly. You and
others could be seriously or fatally
injured.

[ Do not apply the accelerator pedal to
hold the vehicle on an uphill.

Emergency Situations8-10
IF THE ENGINE OVERHEATS
If your temperature gauge indicates
overheating, you experience a loss of
power, or hear loud pinging or knocking,
the engine may be overheating. If this
happens, you should:
1. Pull off the road and stop as soon as it is safe to do so.
2. Shift the gear to P (Park) and set the parking brake
3. Turn off the air conditioner.
4. When the coolant or hot steams gush out of the reservoir, stop the engine
and call an authorized HYUNDAI
dealer for assistance. If the coolant
does not flow out, leave the engine
compartment opened, while running
the engine. Check the coolant
temperature gauge on the instrument
cluster and turn off the engine to
make sure the coolant temperature is
sufficiently cooled down. 5. Cool down the engine sufficiently
and check the coolant level. When it
is insufficient, check its connection
with the radiator, the heater hose,
and the water pump for any leakage.
When there is no leakage, add the
coolant. However, if the problems
persists, such as the coolant leakages,
the cooling-fan malfunction or the
water pump drive belt damages,
immediately stop the engine, and
have your vehicle checked by an
authorized HYUNDAI dealer.

[ You should mix antifreeze and water in
a proper ratio to make coolant. If the
antifreeze ratio is too high or low, it
may cause overheating due to the lack
of cooling function.
(Refer to the Mix Ratio in “Checking
the coolant level” in chapter 8.)

[ If overheating happens repeatedly,
have your vehicle to be checked by an
authorized HYUNDAI dealer.
WARNING
While the engine is running,
keep hands, clothing and tools
away from the moving parts
such as the cooling fan and
drive belt to prevent serious
injury.

Maintenance9-16
Checking the Engine Oil Level
Engine oil is used for lubricating,
cooling, and operating various hydraulic
components in the engine. Engine oil
consumption while driving is normal,
and it is necessary to check and refill the
engine oil regularly. Also, check and refill
the oil level within the recommended
maintenance schedule to prevent
deterioration of oil performance.
Check the engine oil following the below
procedure.
1. Follow all of the oil manufacturer’s precautions.
2. Be sure the vehicle is on the level ground in P (Park) with the parking
brake set and the wheels blocked.
3. Turn the engine on and warm the engine up until the coolant
temperature reaches a constant
normal temperature.
4. Turn the engine off, remove the oil filler cap and pull the dipstick out.
Wait for 15 minutes for the oil to return
to the oil pan.
5. Wipe the dipstick clean and re-insert it fully.
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6. Pull the dipstick out again and check the level. The level should be between
F (Full) and L (Low).
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7. If the oil level is below L, add enough oil to bring the level to F.
Use only the specified engine oil (Refer
to “Recommended Lubricants and
Capacities” section in chapter 2).
NOTICE
To prevent damage to your engine:
• Do not overfill with engine oil. Add oil
in small quantities and recheck level
to ensure engine is not overfilled.
• The engine oil consumption may
increase while you break in a new
vehicle and it will be stabilized after
driving 4,000 miles (6,000 km).
• The engine oil consumption can be
affected by driving habits, climate
conditions, traffic conditions,
oil quality, etc. Therefore, it is
recommended that you inspect the
engine oil level regularly and refill it
if necessary.
ENGINE OIL