Ok so I installed a MP3 to Radio converter a few weeks ago and right after that my AC started going and is now dead. I took off the AC panel behind the switches but could not figure anything out except for the small metal BB that was rolling around in there....anyone know what that is?

 

the bb goes in the ac control ****. There's a DIY for changing the ac control color that, I believe, shows how this bb should be place in the *** control thingy.
that might solve your problem.