my 94 530i/5 air conditioning (and heat) fan shuts off sometimes when in positions 1-3. Position 4 always works. I know fans use a little resistor (or something like that)to make the low ranges work. However, my experience has been when the resistor goes, nothing but the high speed will work. My current problem is intermittent. Usually at a stop light, when the A/C is on 2 or 3, it will suddenly all but stop until I head down the road....
Lake Forest, CA