Paul, do you hear the noise with the climate control off? The humidity and temperature sensor has a fan that should only be powered when the blower motor relay is energized. Also, you could try pulling fuse F45 which supplies power to the fan.
In-Vehicle Temperature And Humidity Sensor
The in-vehicle temperature and humidity sensor contains a thermistor and a sensing element which separately measures the in-vehicle air temperature and the humidity, then sends those readings to the HVAC control module to adjust the actuator doors. The in-vehicle temperature and humidity sensor has an electric fan within the sensor that draws in-vehicle air across the two sensing elements. If the vehicle cabin becomes too humid the HVAC control module adjusts the air inlet door to allow more fresh air. When the humidity level drops, it adjusts back to recirculated air.