you said the fan doesn't work? even if you turn the speed all the way up? I'd say it's the blower motor itself... mine went out not too long ago. 1/2 the time it wouldn't do anything, the other 1/2 it would run, but sounded like s**t... turned out one of the bearings on it went out so it would get bound up, a sharp jarring would break it loose sometimes. Pull the motor and give it a look over. Regardless of anything else the blower motor shoudl work (unless fuses/wiring's bad... but you've already checked that.)