Had same problem with my 2014 F150. Solved the problem today. Long story short never add Freon yourself with one of those do it yourself cans from the parts house. I did it and allowed moisture to get in my system and slightly overfilled as well. Turns out the computer in fords senses this and as a safety feature tells your high speed fan to kick on.
I took to a shop that properly removed my Freon then ran a vacuum to get moisture out, them filled to proper level.
PROBLEM SOLVED