i have a 2003 mercedes S500 4MATIC, my AC and front and back defrosters stopped working.
this happened the following day after a heavy storm ( if that makes a difference ), here in miami.
i tried pressing all the AC buttons, on the console, ( the lights turned on ) but nothing worked ( no air conditioning and no air period ). I even didn't hear any fans going on. Just total silence.
p.S. I have no malfunctions on my COMMAND system.