A lot of times when the A/C Compressor goes out it will pump debris through the lines, ending up in the orifice tube. Usually you need to replace the tube (its only three or four dollars usually). The only other thing I can think of off the top of my head is to measure the amount of oil that came out of the old compressor and replace it with the same amount if it is more than two ounces or add two ounces of oil if the old compressor had less.
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