I had the same problem with the fan running continuously even on cold days. I had a very good mechanic that I work with put his computer on my truck to diagnose it. It said my air conditioning line was putting out 496 pounds. He said it's my air pressure sensor that's is causing issue. When we unplugged it the fan turned off. I'm going to get the part tomorrow. None of the auto parts places had it so I have to get it from the Ford dealership. It's about $30.00. I'm hoping this solves my problem on my 2014 F-150 with the 5.0. It's an easy fix. Unplug the wire, unscrew the valve and replace.