This is not really a bmw only qualified job. Call more first. Also if you are mechanically inclined might be a good excuse to do some of your own repairs. Especially if you have an alternative transport while waiting for parts etc.
Several people on xo have done cooling overhauls with parts lists and photos. There are likely YouTube videos going over each major step.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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