What was found
AFTER TAKEOFF, ENGAGED AIR CONDITIONER. ABOUT 2 MINUTES LATER CREW INFORMED ABOUT A LARGE AMOUNT OF SMOKE ON LT SIDE OF ACFT AND IN REAR CABIN. DISENGAGED AIR CONDITIONER, OPENED WINDOWS AND LANDED. SHUTDOWN ELECTRICAL POWER AND THROTTLE. NO DAMAGE OR EVIDENCE OF FIRE. MX TROUBLESHOT AIR CONDITIONING SYS AND FOUND FREON LINE FROM COMPRESSOR TO BE LOOSE UNDER ENGINE PAN AT UNION. SECURED LOOSE B-NUT EVACUATED SYS, SERVICED SYS AND COMPLETED GROUND RUN AND FUNCTION CHECKS.