Kia Sportage: 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. 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 ...

Other information:

Kia Sportage QL (2015-2025) Owners Manual: Front fog light

Fog lights are used to provide improved visibility when visibility is poor due to fog, rain or snow, etc. The fog lights will turn on when the fog light switch (1) is turned to the on position after the headlight is turned on. To turn off the fog lights, turn the fog light switch (1) to the O ...

Kia Sportage QL (2015-2025) Service Manual: Specifications

Specifications Item Specification M • Type single piston • I.D. mm(in) 22.22 mm (0.875 in) • Piston stroke mm(in) 45±1 mm (1.77 ± 0.039 in) ...