My a/c is working perfectly but the fan (I think) just packed up this morning. Even driving at 40mph, there was a clicking sound and the air stopped circulating when the dial was turned up to 2. It sounds like the fan was making a bit of noise and probably may have just packed up, but there is literally no air circulting through the system at all now even if turned up to 3 on the dial. Any suggestions on how to check this out? I have never worked on this area before. Thanks in advance.