I HAD THE HEATER/DEFROSTER ON WHEN I SMELLED SOMETHING BURNING. THEN SMOKE POURED OUT OF THE VENTILATION SYSTEM INTO THE CAR. I PULLED OVER TO THE SIDE OF THE ROAD AND TURNED OFF THE CAR AND ROLLED DOWN THE WINDOWS. I SAW A GAS STATION SO I STARTED UP THE CAR AND PULLED INTO THE GAS STATION. I TOLD THEM THE PROBLEM AND THEY SAID IT SOUNDED LIKE THE HEATING COIL HAD BURNT OUT BUT THEY DID NOT HAVE TIME TO CHECK IT OUT. I TRIED THE HEATER A FEW DAYS LATER AND A BURNING SMELL CAME OUT OF THE VENTILATION. I HAVE NOT PUT ON THE HEAT SINCE THEN.