Hyundai Kona: Heater / Evaporator Core Repair procedures

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the heater and blower assembly.
(Refer to Heater - "Heater Unit")
3.
Remove the evaporator core cover (A) after loosening the mounting screws.

4.
Pull out the evaporator core cover (A) from the heater unit.

5.
Remove the evaporator temperature sensor (A) from the evaporator core.

6.
To install, reverse the removal procedure.
  
If you're installing a new heater core, add refrigerant oil (PAG OIL).
Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the right O-rings for R - 134a or R-1234yf to avoid leakage.
Immediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption.
Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.
Apply sealant to the grommets.
Make sure that there is no air leakage.
Charge the system and test its performance.
Do not interchange the inlet and outlet heater hoses and install the hose clamps securely.
PTC Heater Repair procedures
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Other information:

Hyundai Kona (OS) 2018-2024 Owners Manual: Drive mode integrated control system
The drive mode may be selected according to the driver's preference or road condition. The system resets to be in the COMFORT mode (except if it is in ECO mode), when the engine is restarted. Information If there is a problem with the instrument cluster, the drive mode will be in COMFORT mode and ...

Hyundai Kona (OS) 2018-2024 Owners Manual: Drive Info display
This display shows the trip distance (1), the average fuel economy (2), and the total driving time (3). The information is combined for each ignition cycle. However, when the engine has been OFF for 4 hours or longer the Drive Info screen will reset. To manually reset the information, press and h ...

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