Hello
I have this '94 Regina 940 that has one A/C line open (cracked at the compressor line bracket) for over a year. My question is: does the moisture contaminated the oil to the point that internal compressor seals are shots now or is it OK just to drain the oil, fill up with fresh and charge the system (after replacing the open line of course)?
Thanks in advance.


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'91 740 turbo SW, '92 940 turbo, '94 940 Regina SW (PL)

The moisture, from air, combines with freon type refrigerants to make corrosive compounds. Drawing a vacuum on the system serves two purposes, first to insure the system is all refrigerant and no air, and second to remove the moisture which causes corrosion. I would pull a vacuum over several hours to insure all of the moisture is gone, and charge the system. The seals should be fine.
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john

You should definitely always pull a vacuum, not only for the moisture issue but to also ensure that you don't have any leaks before charging. If you don't want to worry about moisture in the future, you might want to consider Enviro-Safe refrigerant. I've been running it for years, both in my 134a car and in my R-12 car. It works incredibly well, it's cheap and apparently doesn't have the moisture issues associated with 134a: es-refrigerants.com

I have been using the Enviro-Safe refrigerant for about ten years.
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john