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i think i might have a answer to your problem my 750il had the same issue, the blower motor would shut down just like yours i have able to remove this, clean the brushes, and armature, then adjust the springs to the brushes, when i was making this repair i found the blend door motor linkage had broken which required alot of work, if this sounds like what you need respond but and i can give you detailes to make these repairs
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