Complete 2 Systems worked on DS Carrier HP Split System. HO stated suction line was freezing up affer 4 mins of running. Cycled system, let it run for about 10 mins. Pressures were right. Checked compressor, cfm and blower motor amp draws. Checked dual and run caps. Inspected evap coil. Air filter was clean. Made sure heat strips were not coming on. Couldnt find any thing wrong with system. System is running great at this time.