Air conditioning stops
You could need a new AC Compressor if your vents are blowing air but not cold with MAX A/C turned on. Before you go out and buy a new AC Compressor, check your coolant levels and try to get the compressor recharged. You didn't leave much information but there are shops that can tell you what's wrong with your AC with 30 minutes of time spent diagnosing the problem.
YOu really need a set of manifold gauges to determine the problem. lBut for starters, start the engine and turn on the AC to max cold. Look under the hood at the AC compressor. Look at the front of the compressor straight on, the pulley being turned by the belt. The clutch on the front should be turning. If it is not turning it could be low on refrigerant. When the refrigerant level gets low, the compressor automatically shuts off so it does not get damaged. If it is turning, but cycles on and off every second or so, you are low on refrigerant and more has to be added. Refrig does not evaporate within the system or get low, it leaks out. The leak must be repaired or you will just be wasting expensive coolant. It will leak out again.
Search Ford F-150 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Ford F-150 Experts