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Remove and contain the refrigerant; if you suspect the compressor motor has a burnd-out; treat the refrigerant as contaminated. Disconnect the lines from the compressor, including electrical, replace the filter, and compressor, purge the system, check for leaks, vent the nitrogen, do a pull down below 500 microns, replace refrigerant, and oil. do a run up check pressures, and temp.

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Q: How do you change out a compressor on a ac unit?
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