History: I noticed my ac unit was frozen up super bad. The copper was all frozen around the unit. I had only moved in a month ago and had not yet changed the filter. I changed the filter and the old filter looked like an old rug it was extremely bad. I let the unit thaw out for a day. So now when i turn my ac on it only blows cold air for about 60 seconds and then stops blowing anything all together. I can tell it is starting to freeze up in the short time that it runs...i think. The fan still works when i have the system set to off and turn the fan to on. But why does it only blow cold for about 60 seconds when I initially turn it on? It stops pulling air all together. I stuck my hand where the filter is and nothing is pulling. Any help would be great. Thanks.