AC Fan problem

I have a 1996 Nissan Sentra. It has a 4 speed fan for the air conditioner. Today the first three speeds stopped working and now the highest fan speed is the only one that works. Is this a fan problem? fuse? switch?

Fan resistor pack is either shot, has a blown fuse or has a bad connection. The Sentra blower resistor pack has an inline fuse on the blue / black wire, I’d check that first.