In-Vehicle Temperature and Humidity Sensor
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The in-vehicle temperature and humidity sensor contains a thermistor and a sensing element which separately measure the in-vehicle air temperature and humidity and sends those readings to the HVAC module. The in-vehicle temperature and humidity sensor has an electric fan within the sensor that draws in-vehicle air across the two sensing elements.