The fans on the '91 200's are fused by a fusible link on the left side of the
engine bay. Follow the heavy guage ground wire (brown, natch') and you will
come to a little black box. Inside this little black, plastic box there should
be two screws and a bit of metal. I say "should" because on at least one
listers' car the fuse was removed. This fuse/fusible link is not identified in
the car literature or the Bentley.