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Because it's pumping freon through the pipe and its freezing cold
You have to have a freon leak detector. Are you can put freon dye in the system and find a leak that way.
A closed system would be full of freon without any leaks and a opened system would have no freon or has leaks...........
Probably low on freon. Have the system tested for leaks, repair if necessary and recharge system.
Yes, freon can indeed cause corrosion. Freon leaks in vehicles can corrode surrounding parts and components in the car over time.
If it leaks it leaks. Central units are self contained with no external rotating shaft seals to leak. If the tech came out and added freon without detectng the leak, either he did exactly what you directed, or he is a BS artist hoping for a repeat job.
With a Halogen electronic leak detector.
If the system does not have any leaks, it will last forever.
There are commercially available sealers made.
If there are no leaks, it would not need recharged.If there are no leaks, it would not need recharged.
You can find a Freon leak in a home Ac unit by using a leak detector. These instruments are capable of detecting trace amounts of Freon and pinpoint leaks.
Gasoline and factory odor and catterpillar leaks, my man! And sewage.