Upon arrival tech was informed evaporator coil was freezing. Tech inspected system and found it low on Freon. Performed leak search and found it leaking at evaporator coil. Homeowner approved charging system with R22 Freon to get system back cooling until field supervisor can come out and get new system quoted. Tech charged with 3lbs of R22 Freon. System is back operational at this time but will continue to leak until a repair or replacement of system is done.