Customer informed me that system was freezing up and that there was no airflow coming through the ducts even though the blower motor was running. Inspected the duct work underneath the home and scrubbed it down the evaporator coil. After doing so the system still freezing up. Customer requested estimate on coil pull and clean. This is not recommended on such an old system as it can die very shortly after the procedure is complete. Recommend system replacement.