your resistor has come unsoldered under the dash just happened to me a few months ago, easy fix if you know what you are doing
as he said a couple of posts above this one.
It happened to me too...very maddening it was summer in Atlanta...very hot...really motivated me to fix promptly...it was that resistor had become unsoldered. a search should yield the procedure but it was (as I recall) something like this...remove glove box...remove door to blower motor...remove small box...cut it open (plastic, hack saw works fine)(or maybe it hade a door to remove and no cutting needed)..resolder the lifted metal tab. Made me feel good to save big bucks on a relativly simple fix.
Western North Carolina...
Veni, Vidi, Velcro
(I came, I saw, I stuck around)