Hyundai Kona: Heater / Heater 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 heater core cover (A) after loosening the mounting screws.

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

5.
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.
Heater Unit Repair procedures
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PTC Heater Description and operation
Description The PTC (Positive Temperature Coefficient) heater is installed at the exit or the backside of heater core. The PTC heater is an electric heater using a PTC ...

Other information:

Hyundai Kona (OS) 2018-2020 Owners Manual: Hazardous driving conditions
When hazardous driving elements are encountered such as water, snow, ice, mud and sand, take the following precautions: Drive cautiously and maintain a longer braking distance. Avoid abrupt braking or steering. When your vehicle is stuck in snow, mud, or sand, use the second gear. Accelerate ...

Hyundai Kona (OS) 2018-2020 Service Manual: Repair procedures
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