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I thought my blower motor went out as well- this happened to me last year. I took it to my mechanic and he said he had done a few replacements similar to this. He said the original wiring used to power and run the motor couldn't handle the voltage and that caused the blowout. BMW evidently updated the wiring kits used to support the blower motors as well. I also found evidence of water damage on the backside of my glove box panel, so I don't know what is the real cause of it was. Either way, I was happy to have my warranty cover it and they just went ahead and replaced the entire wiring and blower motor.
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