i40 Blower Motor Failure

That's a pickle! I had a similar gremlin in my old Volvo V70. The climate control was acting up, and it turned out to be a dodgy connection in the HVAC sensor circuit. Have you checked the connector pins for corrosion or damage? Is the auto recirculation function working properly, or is it stuck?

I inspected the connector pins for corrosion or damage and found nothing. I can't ascertain the auto recirculation function because the blower motor is inoperative. Could you elaborate on the specific symptoms you experienced with your Volvo?

I see your point about the blower motor hindering the recirculation test. In my Volvo, the air conditioning was intermittent, and sometimes there was a strange odor inside. Since you've checked the connections and found nothing obvious, it might be time to visit a reputable workshop. These HVAC sensor issues can be tricky to diagnose without specialized equipment.

I followed your advice and sought professional diagnostics. The issue was indeed a faulty connection to the AUC sensor, as initially suspected. The repair cost was 95€. Thank you for sharing your experience; it proved invaluable.