Most newer motors are serviceless=(

THe old time rule for R-22 a/c units was 200 psi plus the outdoor temp(a/c mode summertime). So, 300 psi would be at 100F. Ussually there is a chart, but it depends on the age of the unit. I had a unit which leaked slowly and I'd top it up a few times a year. The leak got worse and the unit died and then I installed a new one.


Michael

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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E