I had a 2011 Toyota Yaris for 5 and half years. During that time, the efficiency of the AC system went noticeably down although it still cooled somewhat. I never had the AC serviced. From this, it can be concluded that the system was slowly leaking. I assume these slow leaks are common, as AC services are widely advertised.
What is the most typical location of this kind of slow leak in the AC system? Is it the compressor seals or something else?
I'm interested in this because my new 2016 Toyota RAV4 hybrid has a hermetically sealed electric compressor, and thus, there are no compressor seals to leak. This kind of compressor doesn't need to be used once a month during the winter to reduce chances of leakage past the compressor seals. If it's the compressor seals that usually leak, I understand that this hybrid vehicle should require absolutely no AC services during its lifetime.