Outside temperature sensor
My 155 has the digital aircon fitted. Today, the outside temperature reading became faulty (always reading -29 deg). This means that the aircon does not work properly - always heating unless set to "Lo" position (then always freezing cold). My question is:
1. Does the aircon have its own temperature sensor, or does it use the engine's air temperature sensor?
2. How can i tell if it is the sensor that is faulty (I hope it is not the wiring or the aircon unit)?