Need to shut the valves. Then release the connection to the coil. It will release refrigerant at this time. After all refrigerant is released, remove the coil. When installing new coil, need to evacuate the new coil of any air or impurities using vacuum pump. Then after connecting back, need to see if the system has enough refrigerant. If not need to TOP up. U can't do this all yourself. Need aircon specialist unless you intend to just dismantle and throw away.
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