Seat warmers are provided to warm the seats during cold weather.
WARNING
The seat warmers can cause a SERIOUS BURN, even at low temperatures and especially if used for long periods of time.
Passengers must be able to feel if the seat is becoming too warm so they can turn it off, if needed.
People who cannot detect temperature change or pain to the skin should use extreme caution, especially the following types of passengers:
WARNING
NEVER place anything on the seat that insulates against heat when the seat warmer is in operation, such as a blanket or seat cushion. This may cause the seat warmer to overheat, causing a burn or damage to the seat.
NOTICE
To prevent damage to the seat warmers and seats:

[A] : Type A, [B] : Type B
While the engine is running, push either of the switches to warm the driver's seat or front passenger's seat.
During mild weather or under conditions where the operation of the seat warmer is not needed, keep the switches in the OFF position.

Information
With the seat warmer switch in the ON position, the heating system in the seat turns off or on automatically depending on the seat temperature.
Front air ventilation seatHyundai Kona (OS) 2018-2026 Service Manual: Rear Wheel Speed Sensor Repair procedures
Removal
[Tortion Beam Axle Type]
1.
Turn the ignition switch OFF and then disconnect the negative (-) battery
cable.
2.
Loosen the wheel nuts slightly.
Raise the vehicle, and make sure it is securely supported.
...
Hyundai Kona (OS) 2018-2026 Service Manual: Components and components location
Component Location Index
Engine Room
1. Expansion valve
2. Service port (Low pressure)
3. Service port (High pressure)
4. A/C Pressure transducer (APT)
5. Compressor
6. Discharge hose
7. Suction & Liquid tube assembly
...