What was found
AFTER LANDING, COCKPIT TEMP INDICATOR ROSE TO 250 DEGREES AND BLACK SMOKE FILLED THE COCKPIT. COCKPIT TEMP WAS UNCONTROLLABLE THE LAST 30 MINUTES OF THE FLT WITH COCKPIT TEMP AT 150*, REST FLT, LEFT PAC VERY HOT. KPWM TO KSFO. ON GROUND AT KSFO, REPLACED ACM WITH OVERHAULED UNIT. LEAK AND OPERATIONAL CHECK NORMAL IAW CESSNA 750 MM 21-51-00. ACM OVERHAULED BY HAMILTON SUNSTRAND. CERT NO SI3R842L.