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Cap them or tape them if you are sure to know what oil you have in the system and that this oil is dead clean and in sufficient amount. But then don't forget to also cap or tape both compressor ports so they don't leak the oil contained inside the compressor.
Otherwise you'll need to flush the complete circuit, including the two condensers and the evaporator (except the TXV) and change the dryer. Or maybe you will need to also change the lines themselves if they are original and probably leaking. No need to cap or tape them in this case as you will ditch them.
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Gilles
RoW 88 Carrera coupé
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