The fuses are aluminum strips on ceramic -- they can both corrode and fatigue crack from flexing when current flows -- it's very common to have a bad one that looks fine until you touch it. The aluminum strip cracks when you flex it.

If one is bad, it's wise to replace the whole set -- the rest aren't too far behind.

The blower motor fuse is not in the fuse box -- it's in a little "coffin" box close by. Pry the cover off and remove two phillips screws to remove it if bad.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!