What was found
SMOKE IN CABIN WITH HEATING AND DEMISTING ON AFTER TAKEOFF. DIVERSION TO SUITABLE LANDING AREA WAS MADE. PRECAUTIONARY LANDING WAS PERFORMED. HEATING AND DEMISTING WERE TURNED OFF IMMEDIATELY WHEN STRONG BURNING ODOR AND POSSIBLE SMOKE WAS OBSERVED. MECHANIC CHECKED CABIN AND WIRING HARNESSES. RAN UP ACFT, TURNED ON SYSTEMS AND OBSERVED. WHEN DEMISTER WAS TURNED ON A SLIGHT ODOR WAS OBSERVED. ODOR DISSIPATED AFTER 2 MINUTES OF OPERATION. NO SMOKE. BELIEVE LINT AND DUST IN DUCT WORK ROOT CAUSE.