I cleaned mine up also because all the sudden it wouldn't run on any speed, from working fine. Tried all types of fixes, replacing the fuse, the resistor pack, the switch on the dash nothing fixed it. I fixed the problem by cutting the positive to the fan and wiring the positive to the fan to the positive of the lighter, lighter still works also. The Blue wire leading to the fan is the negative that controls the speeds. The non-blue wire to the fan is the positive, Seems to have resolved the other issues with the fan. That's when I decided to test the positive wire and found it was dead, thus leading to the lighter positive for the fan. Now it works just great, no issues. On a totally different thread I was looking for a solution and finally in the end I found it was a dead positive wire leading to my blower fan.
