5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
I have the same problem. You should be able to turn off 'auto' and reduce the blower level to the minimum without the climate control taking over as far as I know and when I do this, I get the same symptoms as you. I'm wondering whether this could just be loose connections as my fans tend to cut out for a short time when I hit a bump in the road. I'm having it serviced by a dealer in the next couple of weeks so will see if they can advise.
Just had the car serviced at the dealer and, as predicted by other posts on the board, it was a faulty sensor (Apparently happens quite a bit. The part was £50 + fitting so not a cheap fix, but certainly cheaper than a new climate control unit. If you need the full name of the unit, let me know and I'll dig out the docs.
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