Tech returned to install compressor. Took out old and replace with new. Replaced drier filter Pressurized system. Pressures held , vacuum system to 370 mircos. Added 6 pounds of Freon to system. Checked indoor to verify delta. Noticed when checking indoor. Liquid line and drier filter was sweating. This indicates restriction in line . Cleared lines again , Tech installed new drier filter. Pressure tested vacuum down. Checked indoor still sweating at the drier filter checked indoor piston. Seen piston is the correct. Size. Checked line set and seen were liquid line is to small to be able to carry Freon to indoor system. The cause of compressor failure.. system is struggling to push liquid to evaporator coil. This is choking the system. If line set is not updated to the correct size customer will continue to have compressor failure. At this time system is cooling. Just not efficient and effective.