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changin my ac compressor, what next?

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i got a junkyard compressor, i have r134 and its 12, so monday im gonna exchange them. in the meantime, im wondering after i get the 134 on monday what i need to do after to make my ac work?
i ran without AC for 3 years, but the whole pulley locked up so i HAD to get one. Im just wondering what all i need to do before i actually try to run the ac. anything i should do before or after recharging?
thanks
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