Re: installing new A/C compressor tomorrow, some clarifications needed
it depends what you are expecting from the system. you can buy a retrofit kit without the drier but it's recommended to replace the drier every time the system is opened, like when replacing the service ports and o-rings because it soaks up a lot of moisture from ambient air. i have had success just doing the screw on valve adapters, not opening the system, evacuating and recharging with r134a but the results are not as good as when the whole system is serviced.
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