Hyundai Kona: Heater / 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 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.
Battery voltage: 12.4V or above
Engine : Running
Ambient temperature and coolant temperature
Ambient
Temperature
Coolant
Temperature
PTC
Operation
Below -20°C
(-4°F)
Below 75°C (167°F)
ON
10°C (50°F)
Below 65°C (149°F)
ON
12°C (53.6°F) or above
-
OFF
-
80°C (176°F) or above
OFF

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) 2018-2020 Service Manual: Repair procedures
Service Adjustment Procedure Steering Wheel Play Inspection 1. Turn the steering wheel so that the front wheels can face straight ahead. 2. Measure the distance the steering wheel can be turned without moving the front wheels. ...

Hyundai Kona (OS) 2018-2020 Service Manual: Repair procedures
Inspection – The ON/OFF for FCA is included in the USM (User Setting Menu) and the default is ON. – While IGN is On, it stays at ON, however, the driver's settings do not last next time when IGN is newly On. ...

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