this is my third day looking at threads!!I need help!!

[ron@rydinterior]

the car - 1990 300E the problem - nothing on my climate control panel works!
there is only a slight defrost running continuously, that is really hot! nothing from center vents. no A/c and cannot control the speed = like I said , completely dead!
I also noticed that my auxillary fans are not working either.
where do I start? what does anyone know about this?
I have been reading for three days and still don't know where to begin, please help!!!!
thanks Ron