Kia Sportage: Heater / PTC Heater Description and operation

Kia Sportage QL (2015-2021) Service Manual / Heating,Ventilation And Air Conditioning / 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 (504°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. Recover the refrigerant with a recovery/recycling/charging station. ...

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

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