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Hello and thank you for your question,The common cause for the type of problem you are describing is in most cases caused by a failing LH blend door actuator. The good news is The Left Hand temperature blend door actuator can be accessed from below the Left Hand side of the instrument panel with out having to remove the instrument panel. I have enclosed the location of it in the link below. Its the #6 in the diagram and in most cases replacing it will solve this problem. Copy and paste the link to your browser to open and view the link.https://dl.dropboxusercontent.com/u/104923897/Blend%20door%20Jun%2022.pdf
If you remove the actuator and close the door by hand do you then get cold air?
Ford has released a service bulletin that likely applies as well. See it in the link below.https://dl.dropboxusercontent.com/u/104923897/Blend%20door%20Jun%2023.pdf