My 2011 V6 Pony Pkg w/31,000 had the A/C fail while were on a trip up north on June 6th. Took it into a local Ford dealer (CPO warranty). Turns out the front half seal on the compressor blew out. Long story short, they need to replace the compressor, condenser (it contains the receiver/drier) and the Expansion valve. Only problem is the Expansion valve is on back order, nationally, until July 20th.
BTW, it appears the Mustang and Escape use the same system.
Had a terrible drive back to Virginia yesterday w/ no A/C. Oh, you also lose the defog capability when it is raining. Going to my dealer tomorrow to get the parts on order.