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if you replaced the compressor, you dont have any refrigerant in it anymore. its a gas that boils at something like -22 degrees. once that system is open, your refrigerant is gone!
you flush it with AC system flush and compressed air. you'll have to disconnect your compressor and drier. if you vacuum from the high side it'll suck a LOT of oil out too, but dont count on only doing that. the flush is a bottle of fluid that you literally pour into your lines and blow through with air. just make SURE you disconnect the drier! it'll screw that thing up fast.
the problem with your current o-rings is two fold.. first, they're not R134 compatable.. second, they're so old by now that they probably wouldnt even seal. i picked up 250 new o-rings for like 10 bucks, it doesnt make sense to not replace them! also the replacement gives you a chance to go over all the fittings and double check them. you might want to consider replacing the expansion valve too, its a 3 dollar part and really either makes or breaks your system in terms of cold air output.
im on my second 134a retrofit, both work great!
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