We have a 2003 F250 7.3 diesel. The air conditioner blows cold when we turn it on, but then in 5 minutes or 3 hours later, you just never know, it starts blowing hot air. Then it might start blowing cold again in 5 minutes or 2 hours. My husband thought he fixed it one day when he checked wires under the hood to make sure they were all connected securely and not halfway disconnected. After that we went almost one week without a problem and then, all of a sudden, it started up again with the same thing. So, I guess that might have just been a coincidence. My husband checked the fuses inside on the driver's side and they all seemed to be good. We've taken it to Ford, but they can't find the problem unless it's happening when they receive it. It has plenty of freon. Any ideas would be great appreciated.
F250 a/c blows hot air then self corrects 
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