INTERIOR VEHICLE FIRE IN DASH. 1ST SMOKE THEN CENTER OF DASH ERUPTED INTO FLAMES. VEHICLE IS NOW TOTALLED. GMC IS AWARE OF THIS CONDITION AND ISSUED NO RECALLS. APPEARS SERVICE BULLETINS WERE ISSUED ABOUT REPLACING OVER HEATING RESISTORS FOR THE (HAVC) OPERATING SYSTEM. THE FAN WOULD EITHER STOP WORKING IN A FEW POSITIONS /STOP WORKING ALL TOGETHER OR OVERHEAT AND SET FIRE. *TR