This thread has been a huge help to me, as this forum often is...time to pay it forward.
These are for the rear/auxiliary....both of my motors were gone (2005 EB Expy) but the lower one was making the most racket.
Ford # on the upper part motor (the one that can be reached through the cup holder/tray being removed), responsible for air direction ceiling/floor:
2L2H-19E616-AA ----> This translates to Motorcraft # YH1743
Ford # on the lower/side mounted motor (responsible for hot/cold blend):
3L1H-19E616-AA ----> This translates to Motorcraft # YH1749
NOW - for the lower motor, hot/cold blend door - I could not find that Ford #
anywhere on the internet...!!! The upper motor was all over the web but the lower was a mystery. I initially ordered the wrong part from an online retailer (autopartstomorrow.com) but by the time I figured that out they'd already shipped it - still have to deal with the return. Went to Ford locally here and the guys at the parts counter initially gave me the wrong part # as well (GRRRRR!!!!). Turns out that Ford changed the part # on the lower to 3L1Z-19E616-AB which converts to the Motorcraft part # YH-1749 as mentioned above and the dealer cannot even cross-reference the original # on the part (3L1H-19E616-AA)!
I stayed away from the Dorman parts altogether after reading a bunch of different forums that reference this problem - the general consensus is that the Dorman parts will fail much earlier than the OEM parts and thus, even for the cheaper price - I avoided the possible hassle. YMMV and all that, choose your own path, grasshopper.
I paid ~$50 shipped from autopartstomorrow.com for the upper and $67.xx with tax for the lower from Ford. Could have done better on the lower but I gave up looking for correct part # online and went to the dealer in case I was wrong again - and again, they managed to get it wrong the first time, too and had to refund me in full for the part but we put our heads together and managed to get the correct part the second time. The dealer closest to me (Huntersville Ford) says they normally stock these because they sell so many of them....go figure!
Hope the above helps someone!