[MBZ] Melted fuse body

[BillR]

My AC stopped working a few days ago - not such a problem in January.  I
checked the fuses and the metal was fine, but the 25A fuse body had melted
enough to shorten the fuse and break contact.  Is this a somewhat normal
event?  Haven't started the car yet, just wanted to make sure nothing else
weird was going on.
BillR
Jacksonville FL
1981 300SD    EM    270k miles