2001 sable wag/ac fails to put out cold air after 1hr oc cont run on long hot trip/fan running sounds as thpugh it is blowing against obstr/freon up to spec new compr/clutch/leak repaired prior to this/a thermal switch that showed error code replaced/ no avail/ac manager at dealer drove home (30mi)thought he experienced prob/cleaned out debris form chamber slight improvement/but prob has recurred/plenty of ac for short trips in hot humid baltimore/same prob with HEAT occured on winter trip/if system is shut down for 1hr and we travel with no ac or heat it corrects but recurrs during next seg of long trip…any ideas appreciated??