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Definitely a leak somewhere. No need for a “routine maintenance” refrigerant/oil change on any A/C system car or home. There are some other things, like keeping them condenser coils clean, that do need periodic attention,
The system in my just sold daily driver (Honda CRX Si) went from 1991 to 2019 (when the compressor failed) with it’s original charge of R-12 and worked fine up to the time the compressor died. I know this is exceptional in the extreme but the point is if an A/C stops cooling a leak and low refrigerant is the culprit at least 75% of the time.
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“As new technologies become indistinguishable from magic, and I can no longer tinker, the magic goes away for me.”
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