What was found
A BURNING SMELL WAS DETECTED, ALL ELECTRICAL SYS INDICATIONS NORMAL, SMOKE WAS THEN SEEN ON LT SIDE OF INSTRUMENT PANEL IN VICINITY OF AIR CONDITIONER DISCHARGE PORT. EXECUTED IMMEDIATE PRECAUTIONARY LANDING (PL) AT AIRPORT .5 MILE AWAY. THE AIR CONDITIONER IMMEDIATELY STOPPED PRODUCING COOL AIR, SYS WAS SHUTDOWN, VENTS AND WINDOWS OPENED. PL SAFELY COMPLETED, MECHANIC CALLED TO SCENE AND NOTIFICATION PROCEDURES ACTIVATED. MECHANICS REPORT - CLUTCH SLIPPING CAUSING TO HEAT CLUTCH, PULLEY, AND BELT.