The outside skinny copper line is cold and gets condensation. I was told the fat line should be cold and the skinny should be hot. The outside unit starts, but I can hear it stop after a few minutes, but the fan keeps going. I called a place and they said it could be a filter somewhere or the compressor may have broken. I'd like some thoughts so I don't get taken to the cleaners. I don't see ice anywhere. Sounds like it might be expensive.