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Mobile ACs are now designed to never require a recharge but it depends on the car. My Subaru has an o-ring on the top of the compressor in the heat that dried out and leaked. The crimp on the rubber hose leaked on my Audi.
My vintage Porsche had hoses that were designed to leak a small amount. These are not used anymore.
Running the AC a few minutes every month is supposed to circulate the oil and lube the rubber seals. I not sure if this is really shown to be effective.
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Rick
88 Cab
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