What was found
RIGHT AT V1, EMER PRESS CAME ON FOLLOWED BY ACM OVERHEAT, AIR DUCT OVERHEAT ALSO AND SMOKE STARTED TO FILL THE CABIN. - GAINED ACCESS TO THE ACM, VISUALLY INSPECTED INLET DUCTS FOR DEBRIS NONE FOUND, TROUBLE SHOT AND FOUND AIR CONDITIONING TEMP SWITCH INOP. REMOVED AND REPLACED TEMP SWITCH (ST020) WITH A NEW SWITCH, OPS LEAK CHECKS GOOD IAW CE-560XL MM CH 36-11-00.