Coolant Temperature Sensor
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of HYUNDAI MOTOR AMERICA
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The A/C Control Module receives data on the coolant temperature from the engine ECM through CAN Communication Lines. It could control the mode actuator and set the wind position to DEF when cooling the engine.