Transfer from T2 to T3 at PEK

Hi I will be flying with Air Astana to T2 of Beijing (PEK) and then having to transfer to Air China for a domestic flight to Ordos from T3 (assuming that's where all Air China flights takes off from). I have 3 hrs exactly from the moment my plane lands in T2 and the departure in T3. I have been doing quite a bit of reading, and trying to understand whether this is a sufficient transfer time, given that I will have to collect my bags , transfer terminals, and check the bags back in T3... Thank you!