1983 300sd converted to R134a by PO. Ester Oil.

It was the ETR, I tightened the small brass screw on the etr and now the compressor kicks on.

The expansion valve gets cold and condensation forms on it. The low side pipes get cold.

I hear constant clicking at low RPMS from inside the cabin, I can't hear it when I am outside the car, even with the hood up.

the air coming out of the vents is ambient temperature.

When I push the middle button, I hear the vacuum change and the blower speed increase. The air is ambient temp.

What would yall do from here?

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
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