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This may not be pertinent, but for what it's worth, I had a similar issue with a 2011 128i where the blower motor would cut out for 2-3 seconds and then restart, usually shortly after start-up. However in my case I sometimes also had a yellow warning indicator at start-up displaying a car on a lift.
Problem first occurred after the car was left parked for 10 days at an airport.
Service manager advised a weak battery can cause meaningless warning indicators, and as it turned out, the battery was indeed the problem. When kept fully charged everything worked fine. BMW replaced the original battery and the problem never reoccurred.
However, when I took my car in for service a week ago BMW replaced my battery again, this time with a larger one, as part of a 128i recall in Canada.
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