Report "Central air My central air unit continues to freeze up on the outside, as well as on the inside on top of the furnace. I had it checked and was told the return flow was the problem and to take the fliter off and make the return flow larger. This has done nothing!!! It continues to ice over. Any ideas? Please..it is sooooooo hot here right now. Have never had a problem with this and all of a sudden it is freezing up. Thank you"