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Something has changed. If your tech has been servicing the unit for a while he should be able to pick that up.
+ 3 or 4 to airflow then charge. It is possible that the TX valve if equipped has lost pressure in its element simulating a full closed valve. Eventually this will cause a full freeze on the coil, but it takes a long time to do it. If charge is good and airflow is unchanged, look to the metering device. They can wear and develop glitches and allow full flood and coil starvation.
Has the system been topped up lately? Correct Refrigerant? Oil compatibility?
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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