My a/c quit working and I had a tech come out. He found the metering valve bad in the airhandler and wanted over 500 to replace it. Well I wasnt paying that much so I removed the last 20 feet of insulation on the bigger line to the unit outside and put heat tape on it. Buy doing this Im heating the refrigerant up and turning it into a vapor so theres no liquid to the compressor. Everything has been fine since I did this and I thought you guys might start doing this if you run into a metering problem.