Unfortunately, the RV roof top A/C’s are not rechargeable, unless they have changed things in the past few years. They are a sealed unit and basically a throw away if the refrigerant leaks out. Stupid, I know. It happened to me in Alaska. I have heard of some shop in Florida that will cut into the system and install a recharge valve, but there is no guarantee that after they do and you recharge the system, that it will work. The only check to see if the system is workin* correctly, that I know of is to check the temp of the air coming out if the A/C.
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