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Hello, my name is***** turning it back/fourth seems to help then it sounds like problem is control assembly in dash or blower motor relay which is located in fuse box under the hood. I'd recommend replacing the relay yourself which will cost about $5 and take you 5 minutes. If that doesn't help it will cost around $300 at a shop to have problem diagnosed and repaired. Let me know if you have more questions or if there is anything else I can do to help. Thanks.
Here is a picture of relay https://www.dropbox.com/s/y3bku03dhylvknx/bmrsd.pdf?dl=0