The blower motor fuse is a problem area. M-B provides an aux fuse kit for the fuse. You remove the fuse and it gets replaced by a matchbox-sized fuse holder. That reduces the likelihood of a full fuse-box meltdown and electrical fire.

When I bought my car I thought I was scammed: "hey - the A/C sort-of worked on the test drive, but now it's kaputt and there's no fuse but some melted plastic....oh, okay, extra holder...got it...."