Fan position #4 had just begun to flicker the past two weeks. Nothing looked like it had gotten hot/wires weren't brittle. I didn't measure the voltage on any of the fan wires. Next time I tear into the dash, I'll get a reading and post back (will have to wait until summer cools off).
Thanks Pasadena for posting this *fix*. I just finishing following all your instructions....and BEHOLD I have A/C on fan speed 2 and 3!!! Kyle was right, this wasn't nearly as difficult as I first thought. I had tried the wire crimping fix from the other thread and it worked for about 1 month...