XC90 problem automatic air conditioning

Hello you! Outside it gets colder again and there comes again, the almost forgotten problem: cold feet, draughts, wrong working climate automatics With me will then give again a new workshop round. Many have reported that on longer rides the climat. suddenly switches to cold or wildly regulates. Maybe it is (as already mentioned) the following cause: the enormous heating up of the center console fittings is well known. Maybe it is really because the temperature sensor for the room temperature is also in this panel!! It sucks the air somehow via a small fan (at least the workshop master says) but is firmly connected to the surrounding heated parts. That would explain everything or? Who knows why the temperature sensor is in the middle – where it is supposed to be a two-zone automatic. The friendly spoke of two sensors, but where the second one sits He couldn’t tell me. Furthermore, the fan noises are enormous loud, but only in heating operation – it sounds like,(especially with the middle outflows in the dashboard) as if the fan is running against almost closed flaps – that would also explain the small amount of warm air from this area. What have you researched so far??