AFTER TURNING ON THE DRIVER'S SEAT HEATER, IT DEFAULTS TO HIGH, THE LEFT SIDE SEAT BOLSTER STARTED TO SMOKE. A FEW SECONDS LATER BEFORE MY WIFE REALIZED WHAT WAS HAPPENING SHE FELT HER LEFT ARM AND SIDE GETTING A LOT HOTTER THAN THE REST OF HER SEAT. THE SEAT HEATER THEN IMMEDIATELY BURNED A HOLE THROUGH THE LEATHER SEAT WHILE MY WIFE WAS DRIVING DOWN A CITY ROAD.