Moin, it’s a 2002 V70 II. The climate control unit (CCM, MCC – manual climate) gets the outside temperature from the right outside mirror (PDM) and goes over the DIM (Tacho) to the CEM. The tacho shows the correct (outside) temperature. However, the CCM says that the outside temperature is -40°C. (Fig. 1) Why? For me this doesn’t make sense. Vida, oscilloscope, etc would have no idea what I should measure. In the fault memory of the CCM there is nothing. Except “check the switch, control unit of the air conditioning system (CCM)”; I did and works. The measuring range goes from -10°C to 80°C, how can the CCM show -40°C? (Fig. 2) I don’t know if it belongs to it, but the controller regulates the blower by itself (Fig. 3) Is not so much and not always. But if you touch the blower control and pull/press it already changes, however, it also regulates itself from Potling contact.