VEHICLE WAS PARKED IN DRIVEWAY FOR 6.5HRS. WAS UNOCCUPIED AND NOT RUNNING. KEY WAS NOT IN VEHICLE. NO ACCESSORIES WERE PLUGGED IN. FLAMES SUDDENLY ERUPTED FROM UNDER HOOD DRIVER'S AREA. VEHICLE CAUGHT FIRE AND IS A TOTAL LOSS. I HEARD THE HORN SOUND PRIOR TO NOTICING THE SMOKE AND SEVERAL TIMES IN THE FIRE.