Check fuses
Check fuses
Get a new one
Turn the rheostat a few times to make sure it isn't corroded - probably need a new one
They only go down, you have to lift them up yourself
Lousy radio to begin with - get a rebuilt($$$) or a replacement ($-$$$$)

PS: include the year to your signature, and add your location to your profile - makes things easier.
PPS: Congrats on your "new" Benz!

__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D