Had this issue with my 2015 Super-Crew 5.0 liter F150.I first observed the temperature indicator appeared to be in its normal temperature range during summer driving in New Mexico. I shutoff my A/C while the engine was still running, and within 45 seconds the obnoxiously loud, high flow fan shutoff. I shut the engine off for 30 minutes (resetting the computers and sensors). I started the vehicle and let run for 30 minutes, in that time not once did the high flow fan turn on. By segregating the A/C from the rest of the cooling system, I was able to see if the high flow fan was turning on due to the A/C or something else in the cooling system. I have the equipment and experience to evacuate the refrigerant, contaminants, check for leaks and recharge the A/C. Many people do not and I strongly recommend you have an A/C certified professional do this work. This ensure the A/C system is properly, cleaned out, leak checked and recharged. Pressure verification and contaminant removal prevents an over pressure (or...