2007 Town Car "Designer" series. 38K miles. Just bought it. Driving it around, AC on...cold air on drivers vents, hot on passenger side. What the heck? Check forums. Run EATC diagnostic. 2266 1263 2267 1264. Got it. YouTube. Looked at videos of actuator locations in 5 places. Best guess is, even with 4 codes, likely 2 are intertwined with each other. More research. On to Rockauto website. Order 2 actuators and replaced one so far, the one labeled Motorcraft "YH-1753" simply listed as "Blend" on Rockauto. Replaced it and it's the easy one...passenger side, where you only have to remove the glovebox (technically). I removed the air bag as well. This was relatively simple. OK...replaced the replaced the unit, reinstalled the airbag, did the cold boot process and the follow up diagnostic test gave me 1263 (key off), then1263 1264, then a 3rd run gave me 1263 (Panel/defrost door failure) so I figure 1263 is pretty solid. Rockauto lists all 5 "YH" part numbers...YH1753 (Blend), 1754 (Defrost mode), 1755 (Floor mode), 1756 (Recirculation) and 1768 (Located at inlet door. Main unit ATC). Out of all of those "YH" part numbers, YH1754 is the only one that even mentions the word "defrost" in the part description. I ordered the part and the actuator has a plastic lever. Any idea, with a 1263 code, is the YH 1754 the correct line to pursue or am I barking up the wrong tree?