I'll bet  that the fan switch is melted.  Take it apart and
get a replacement from the junk yard (that's what I did).
 Malcolm

On 19 Aug 2001, at 8:56, Zoltan wrote:

I have this '86 Westy here and the fan for the fresh air is
not working.  The fuse is fine.  Where do I start, what
may be the culprit.
Zoltan