I'm not sure what could be the problem, it might be something I need to have a professional look at, but wanted to see if we could try some things ourselves first. Last year, the AC worked during the summer. There were however times when it did not. Like I could turn the truck on, turn the AC on and nothing, now once I was driving it would miracously come on. It did this a few times, then it just stopped working period. Been that way almost a year. Heat doesn't work either. I hear no fan running either. Is there a way to check for a bad compressor or fan before taking it in? In the winter though, there is a TINY TINY bit of heat coming from the vent, I don't know if it's the heat from the engine or not, it's just enough heat to defrost the windows, BUT when I come to a stop, the heat stops..... Any ideas or thoughts?