I WAS IN MY 2007 MERCEDES GL450 AND HAD DRIVEN APPROX. 2 MILES WITH MY FRONT DRIVER'S SEAT HEATER ON. I STARTED TO NOTICE A STRANGE SMELL AND SUDDENLY THE CABIN WAS STARTING TO FILL UP WITH SMOKE. I IMMEDIATELY STOPPED THE VEHICLE AND DISCOVERED THE LEFT SIDE OF THE BACK OF MY FRONT DRIVERS SEAT WAS ON FIRE. SNOW WAS ON THE GROUND SO I SCOOPED UP SNOW TO PACK IN THE FIRE/HOT SPOT WHICH HAD BURNED A LARGE HOLE THROUGH THE VINYL AND INSIDE PADDING MATERIAL. I LATER NOTICED THAT MY JACKET HAD BURN MARKS AND A HOLE IN THE EXACT LOCATION OF THE POINT OF THE FIRE. *TR