The other cold, rainy night while driving home from a local soccer game, with lights and wipers on, heat and defroster and rear defroster on full blast by the time I got the 5 miles back, the blower fan had stopped operating. When I pulled the fuse cover I found # 8 fuse, a red 16 amp unit, had melted in its socket.
The next morning I replaced the fuse and tested the blower for a minute with just the key on and it worked fine.
Last night with just the lights and defroster running on the same drive, it occurred again. This time I smelled a hot electrical odor and sure enough, #8 fuse was completely melted to an unrecognizable lump!
According to the fuse box cover, that fuse controls the blower fan, AC comp and and idle stabilization?.
My AC belt is off so I assume that is not an issue, Idle stabization I am uncertain about but the blower fan has been in service.
The fan works at all speeds and makes no unusual sound or smells so I am at a loss as to where to begin to track this down.
Any direction will be much appreciated.
This is in my 81 240.

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1981 240D 143k 4 spd manual -SOLD

2004 VW Jetta TDI 5 speed 300k -still driven daily