This shows the outside temp sensor that reports the temperature to the digital dash.

When it shows -40C, the sensor is dead or a wire/plug is loose. The sensor value is thought to be 3.6k

 

928 613 241 00 Schalter 65,90
928 555 463 02 Gewindebuchse 6,28
928 613 082 00 Knopf 5,83
928 613 240 00 Umschalter 56,30