HAD JUST PARKED VEHICLE. EARLIER HAD SMELLED AN ODOR OF PLASTIC BURNING. LEFT VEHICLE, AND SMOKE STARTED COMING OUT OF DASHBOARD. THEN ELECTRICAL COMPONENTS STARTED (LIGHTS FLASHED, HORN BLEW). FLAMES THEN APPEARED. FIRE DEPARTMENT ARRIVED AND PUT FLAMES OUT. GAVE AN INDICATION OF A SWITCH BEHIND HEATER CORE WAS SOURCE OF FIRE. *AK