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You can't get to the evaporator. It's not the problem, so don't worry about it.
Older cars simply turn on the cooling fan when the a/c is on. Like I said, I really don't know BMW's logic. I suspect since it's a single cooling fan, there is some more complicated control logic. But the fan works. I really don't think there is any sort of sensor failure.
Also keep in mind that with the a/c on auto, it may be cycling the compressor, or it may not be warm enough outside for it to come on.
I think the next step is to check for proper refrigerant charge.
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