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Freezing can be caused by an overcharge condition, not an undercharge. Low airflow at the evaporator or condenser can also cause freezing. Seeing as you probably have plenty of airflow across the condenser at highway speeds- that is out. Leaves and other crud coming in through the cowl can clog the evap coil. A sticking POA valve is another definite possibility. Check the airflow in the cab at all fan speeds. if it is fine probably the POA.
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