#19 fuse blew yesterday (E34 535i, build date 9/88), fan blower quit when the fuse blew. What prompts the question is - the fuse apparently took its time to blow. Obviously got very hot before blowing, the fuse plastic (not the blade metal) was noticeably melted at the blades, and it didn't just pop when it blew, it left a good sized (for such a small fuse) smoke mark on the inside of the fusebox lid (open-topped 30 amp stock BMW fuse). Stuck a conventional 30amp fuse in today, blower kept working, didn't have a chance to look again see if there was any evidence of stress/heat on the new fuse (but, I will tomorrow). Isn't it a bit odd or concerning that a stock fuse would get so hot before blowing, instead of just popping less dramatically?