What was found
AIR TURNBACK DUE TO THE CREW REPORTED DURING CLIMB, THERE WAS A HAZE AND ODOR IN THE COCKPIT WITH AN ASSOCIATED EQUIPMENT COOLING FAN OVERHEAT WARNING. REPLACED A SEIZED LEFT ACM. REPLACED LT LOW LIMIT VALVE AND REHEATER AS PRECAUTION. PERFORMED WATER SPRAY NOZZLE CHECK FOR LT PACK, CHECKED GOOD. INSP 2.5 BLEED RING FOR OIL LEAKS, NONE NOTED. PERFORMED SINGLE PACK CONFIDENCE CHECK, ALL WITHIN LIMITS. REPLACED RT TEMP CONTROL VALVE DUE FAULT, LOG 4387226.