What was found
FLT 1224 LTV SHUTOFF ON FINAL APPROACH. CAPT REPORTED SMOKE WAS SEEN AND SMELLED IN CABIN. T/S SYSTEM FOUND COOLING AIR LIGHT ON AT MX PANEL, VERIFIED LTV SYSTEM SHUT DOWN PROPERLY DUE TO COOLING AIR /ACM FAILURE RESET LIGHT AND RE-ACTIVATED LTV SYSTEM. OPS CHECK/TEST NORMAL REF MM 44-20-17. THIS CLEARS THE MEL, PLACARD REMOVED MX-4 UPDATED, DDG REVISED, MCC NOTIFIED. ON TAXI OUT AFTER STARTING ENGINE ONE, EXPERIENCED SMOKE (SMELL & VISUAL) IN THE CABIN, ALONG WITH A VERY HOT TEMPERATURE. PACK 2 FAIL FOUND BAD BEARING IN R/AIR CYCLE MACHINE. REPLACED R/AIR CYCLE MACHINE PER AMM 21-51-05. OPS CHECK GOOD.