I thought the same thing about roof A/Cs. They are not serviceable. You might be able to have a high and low side fitting installed and then evac and recharge the system and add some dye. But if it is low, there is a leak some where. And not sure if those parts are sold separately.
A roof A/C services is to make sure that your intake filters are clean and go up on the roof and clean the condenser.
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2016 DRV38RSB3
2015 Ram 3500 Regular Cab DRW CTD Asian trans 410 rear
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