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By law, to do such work, you must be ASE certified, and the shop you're working in must be EPA certified to perform work on AC systems, and possess the necessary equipment.
The refrigerant must be evacuated from the system - this requires a machine which does the recovery (it also weighs the amount of refrigerant recovered, which lets you know if more needs to be added or not).
When the compressor is removed, the AC system is opened up. This means that the receiver-drier (if it's a Thermal Expansion Valve system) or accumulator (if it's a Fixed Orifice Tube system) must also be replaced.
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