Any history on this car?

If the expansion valve was not opening enough, the high side would be going very high and low side very low / suction.

Is the large hose leading from the evaporator to the compressor cold maybe frost covered? If so , the expansion valve is working.

You might have a stuck open heater valve / blend door staying in the hot position. Feel both heater hoses, are they of equally hot temperature? If so the heaver valve is open.