I arrive on an American Airline Code share with China Southern (DFW-PEK-HRB)

Upon arrival in Beijing, on a code share American Airline flight (DFW-PEK-HRB), do I need to claim baggage at PEK or will it automatically go to final destination (Harbin)?

Also, how long does it take to get from terminal 3 to terminal 2 (including immigration time)?