Ambient Temperature Sensor (ATS)
WARNING: This page is about a different car, the 2014 Kia Optima. However, it is still accessible from the selected car via links, so may be relevant.
Ambient Temperature Sensor (ATS) is installed on the front-end module and senses the ambient temperature.
This sensor is exposed to the ambient air temperature in front of the radiator.
The ATS is a Negative Temperature Coefficient (NTC)-type sensor and its resistance is in inverse proportion to the temperature.