I WAS DRIVING ON THE I-95 AT 60 MPH AND TURNED ON MY AIR CONDITIONER WHEN SMOKE BEGAN TO COME OUT OF THE VENTS. I SHUT OFF THE AIR CONDITIONER AND THE SMOKE STOPPED. I VISITED WITH MY PARENTS AND AS I STARTED THE CAR AND IT WAS IDLING, I TURNED ON THE AIR CONDITIONER AND SMOKE BEGAN TO COME FROM THE VENTS AGAIN AND FLAMES APPEARED UNDER THE DASHBOARD. I WAS ABLE TO PUT OUT THE FIRE AND PULLED THE FUSE BOX COVER OFF AND FOUND THE FUSE BOX WAS WHERE THE FIRE HAD STARTED. THERE WAS A PAPER WITH FUSE SIZES AND LOCATIONS PUT (BY MERCEDES) IN BETWEEN THE FUSES WHICH HAD BEEN SINGED, AND PART OF THE FUSE BOX AND SOME OF THE FUSES HAD MELTED. I DID AN INTERNET SEARCH AND FOUND A COMPLAINT ON A MERCEDES FORUM WHERE THIS HAD HAPPENED TO ANOTHER 2004 MERCEDES C230.