What was found
DFW - FLT 1826 - AFTER T/O DFW DURING CLIMB-OUT AT FL100, HOT ODOR NOTED IN CABIN FOLLOWED BY SMOKE FROM AIR CONDITIONING SYS. LEFT ACM WAS OBSERVED IN FULL HOT POSITION WITH TEMP CONTROL SWITCH IN AUTO POSITION. TURNED OFF LT ACM AND A/C RETURNED TO DFW, LANDING OVERWEIGHT W/O INCIDENT. PLACARDED COCKPIT TEMP CONTROL INOP IN AUTO MODE AND PLACARDED LEFT ACM THERMAL CONTROLS SWITCH INOP. ACCOMP O/W LANDING INSPECTION WITH NO DEFECTS FOUND. SYS GROUND CHECKED NORMAL OP. REPLACED LT ACM 130 DEGREE THERMOSTAT SWITCH AT SEA. ACCOMP GROUND ENG RUN AND OPERATED LT AND RT ACM THROUGH FULL RANGE HOT AND COLD WITH NO DEFECTS OR ODOR NOTED. SYS GROUND CHECKED NORM OP. REMOVED PLACARDS. (M)