I was driving my Durango home and it was blowing cold air and all of the sudden it was blowing hot air. got home and the next day I drove it and checked the air and it worked fine. Haven't had a problem with it since. But it only has been 3 days since it heppened.

 

Could be many things
1. A/C Relay
2. pressure switch
3. low coolant and/or pressure
4. clutch on compressor
hard to tell if it happens again pop your hood and look at your compressor to see if the clutch is spinning that will narrow it down