You would think that if the DME didn't like something about the fan it would set a code as well, but we are clutching at straws here. Very strange that the DME won't work the fan for engine temp either. Something is being missed somewhere and/or there is more to the story.

If it hasn't been done I would really have a look at a wiring diagram and theory of operation/system outline. And would be good if someone with manual A/C could chime in but I don't think it is very common.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)