Congratulations on you 'new' coach.
Those should be for the dash A/C. My dash A/C doesn't hold freon and since I run the genset most of time in the summer anyway, I haven't bothered to try to find the leaks and fix it.
The basement A/C units in that time period were made by Dometic. If I get some time, I will try to crawl under the coach and see if I see any names on the dash A/C units.
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