See if a swift kick towards the glove box in the passenger footwell gets the blower going. If so, it might just be worn brushes. There's a thread on replacing blower brushes for cheap. Pulling the blower is a 5-15 minute job. If the motor has axial play, replace it unless you're well trained in electric motor repair.

There might be a separate case outside the fuse box that has a couple of fuses for the blower motor. I haven't found that box in my SDL but there's a picture of the retrofit kit at FastLane. Given the length of lead in the picture, it can't be too far from the fuse box. All I see around my fuse box is leaves :/

Sixto
95 S420
87 300SDL