Turned on system. Was set at 70. Found high temperature drop. 23. Found 3M pleated air filter restricting flow, causing System to ice up. Replaced air filter. Blew out clogged drain trap. Checked system for leaks. Found evaporator coil leaking. Needs new evaporator coil. Work suggested: recommend fiberglass type air filters. Air filters to be delivered. Need to check on cost and availability replacement of evaporator coil for air handler.