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You need to vacuum the sytem and check for leaks before recharging. But even before you do that you should check and see if there is pressure in the system. If there is, your problem lies elsewhere, like the pressure switch, compressor, or clutch. You can hard start the compressor by giving battery power to the 12v clutch signal if there is pressure in the system. That will let you know if it's the compressor or the pressure switch/wiring.
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