I think I have a frozen coil(black rubberish coated pipe fr outside to furnac@e/ac.) It has breaks IN the coating with icy pieces sticking out. I put the fan on a couple of he ago. How will I know when I can turny Ac back on? Should I repair the breaks in the insulation and how would I do that? The wholesale Started when someone put a plastic bagged filter I'm front Of the air intake and it just sucked it over to the vent covering it about 65%.