Hyundai Santa Fe: Heater / PTC Heater (Diesel only). Description and operation

The PTC (Positive Temperature Coefficient) heater is installed at the exit or the backside of the 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 the heater controller operates PTC relay 2 with an interval of 15 seconds.

Operating Condition

PTC heater operates according to the following conditions :

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PTC Heater (Diesel only). Repair procedures

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Other information:

Hyundai Santa Fe (TM) 2019-2025 Owner's Manual: Smart liftgate

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Hyundai Santa Fe (TM) 2019-2025 Service Manual: Heater & A/C Control Unit (Manual). Repair procedures

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