I don't think there is much that commonly goes wrong that overlaps all that much with replacing the blower motor. Plus, the blower job is not nearly as big as it seems/looks and you will probably spend 1/2 the time or more cleaning.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)