That did the trick.

The fuse looked fine but upon closer inspection I found a hairline crack through the metal strip at one end.

Replaced it and the blower works fine.

Now to figure out why I'm in fifth gear by the time I hit 30mph.

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?