Go looking in the archives for blower motor fuse. Your issue with that fuse is not uncommon. The cure basically is to refuse the blower outside the fuse panel I think and a slightly higher fuse value is allowed.

In otherwords part of that blower wiring was a designed in problem to a certain extent. Usually an electrical engineer will work a fuse at a lower percentage of its trip value and design holders for it that are up to the job. I suspect there was a bit of a misteak and not enough allowance for reasonable aging in that one circuit on these cars.