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i will have to check my notes but if memory serves me correctly, im sure theres a way to check the cabin blower fan by powering the blower fan to full speed by removing the FSU fuse & making a wire to bridging two of the FSU's connectors wires(i struck a similar issue to this on an 01 530i a long time ago)in the end the cause of the issue was a faulty wiring plug at the ambiante temp switch under the front of the car, anyway i will dig through my notes & find out the two wires that will give full power to the internal blower fan through the FSU connector wiring(at least then u will know your cabin blower fan is working)
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