TL* THE CONTACT OWNS A 1998 BUICK PARK AVENUE. THE CONTACT WAS DRIVING APPROXIMATELY 1 MPH IN A PARKING LOT WHEN THE HEATER AND REAR DEFROSTER WAS ENGAGED. THE CONTACT THEN SMELLED A BURNING ODOR FROM INSIDE THE VEHICLE AND NOTICED SMALL FLAMES EMITTING FROM THE REAR DRIVER'S SIDE WINDOW PANEL. THE ENGINE WAS TURNED OFF AND THE FIRE WAS EXTINGUISHED. THE FIRE DEPARTMENT ARRIVED AND DISCONNECTED THE DEFROSTER WIRES. THE VEHICLE WAS DRIVEN FROM THE SCENE AND WAS NEITHER DIAGNOSED NOR REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED OF THE PROBLEM. THE APPROXIMATE FAILURE MILEAGE WAS 140,000. THE VIN WAS UNAVAILABLE.