Though I am not formiliar with the 16 fuse. I am curious, what does the fuse go to. (not up on my fuses, haynes manual outside) I should think that would be your main concern. Fix the source of the problem, then rewire a new fuse, there must be something going on.

Blower motor is probably starting to sieze, the noise will get louder and start to eventualy do it no matter how high the setting is on. After markets are about $40-50. You could go bosch but it will cost you a pretty penny. I have taken one out of the salvage yard in a pinch. I test it while I am there befor purchase. Just bought one yesterday for $8, don't know how long it will last but for now it will do. Carefull about letting the blower go for too long or you will blow the fuse. Every time you let it go it will get worse...

anastasia
1986 740t silver wagon 362k