[calflan]

After the air conditoner has been ON for 20 minutes or more, the lines from the accumulator freeze up and the airflow from the ducts slows nearly to a nothing at all. No cold air either. Recently had the system vacuumed and reserviced with freon. Same condition after servicing.
Why would the lines be freezing ?
Is the expansion valve able to be changed or is there a assembly that contains it ?

Thanks.