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Re: A/C retrofit kit
New O-rings is recommended that way you don't have to re-do them if old O-rings leaks.
However, if you put new AC components. You must pull the vacuum with a vacuum pump for at least 60 minutes. It allows you to get rid of any moisture in the AC system and allows you to find out if there is any leak. After pulling the vacuum for 60 minutes then you can introduce R-134a refrigerant.
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