Hyundai Kona: Heater / PTC Heater Description and operation

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 element as an auxiliary heating device that supplements deficiency of interior heat source in highly effective diesel engine. The electric heater heats up the interior by directly heating the air that passes through the heater. The name itself implies that the element has a proportional resistance change sensitive to temperature.

Operation Principle

ECM outputs a PTC ON signal and operates PTC relay 1. Then heater controller operates PTC relay 2 and PTC relay 3 with an interval of 15 seconds.

However, PTC relay 3 can be operated while battery voltage is above 12.4V.

Operating Condition

PTC heater operates according to the following conditions.

Heater Core Repair procedures

Replacement 1. Disconnect the negative (-) battery terminal. 2. Remove the heater and blower assembly. (Refer ...

PTC Heater Repair procedures

Inspection Operating Logic Test (Manual only) Inspect the PTC operation by confirmation logic as follows; 1. Entering (1) ...

Other information:

Hyundai Kona (OS) 2018-2026 Owners Manual: Checking the amount of air conditioner refrigerant and compressor lubricant
When the amount of refrigerant is low, the performance of the air conditioning is reduced. Overfilling also reduces the performance of the air conditioning system. Therefore, if abnormal operation is found, we recommend that the system be inspected by an authorized HYUNDAI dealer. WARNING Vehicles ...

Hyundai Kona (OS) 2018-2026 Service Manual: Troubleshooting
Troubleshooting Symptom Suspect Area Remedy Engine will not crank Battery charge low Charge or replace battery Battery cables loose, corroded or worn out Repair or replace cables ...