Good evening,
There is a core in the port that is like a tire valve for your ties. That part can be changed only.
If the rest of it has corrosion, then no, it cannot be replaced.
https://www.2carpros.com/articles/air-conditioner-leak-detection
As far as replacing the core, the system needs to be recovered and vacuumed down for 15 minutes before you can change the valve. The tool is something you can get at a parts store.
Roy
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Friday, July 3rd, 2020 AT 4:24 PM