If asking about chassis/ dash A/C, it (Usually) loses (R-134a freon) through rubber hoses/ and rubber or metal fittings, but I do not agree w/ 10% loss/ year or cars could not go 10-15-yrs w/o recharge (and some do); rooftop units mainly use R-22, and should lose none, but metal tubing can suffer from corrosion or cracks w/ age.
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THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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