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my 2011 F-150 does some crazy weird stuff with the AC as well - I've got the base system with the red and blue knob and another one labeled 1234 for the fan speed.
Sometimes, even without the AC on, and the system set to 'vent' (not blend or defrost), the air coming from the vents will be ice cold.
From what i've heard this is Ford's way of ensuring that the AC compressor will always run sometimes to prevent issues caused by long periods of not being used. It shuts back off within a few minutes of the engine being started.
It also appears to adjust how 'hard' the compressor runs based off the outside air temperature - the air coming from the vents at 95 degrees ambient air temp is noticeably cooler than the air coming out at 75 degrees.
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