NO AC - Heard a sound like a line blew. System was completely out of Puron upon arrival. Added nitrogen to system to try to track down leak. Leak is massive and most likely inside flex lineset. Leak may also be inside indoor coil but not seeing any signs of oil. A full leak search would need to be scheduled for a more exact location. Gave customer an estimate around $2000 for replacement of lineset. Left outdoor coil disconnect off and service valves closed.