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I have never heard of a precharge. Is like like preheating an oven?
Do you mean re-charge?
My El Camino never leaked until the compressor blows up. After 324,000 miles I have been through three compressors. I use my AC a lot in Oklahoma.
My 911 does not leak anymore now that I have barrier hoses. If you run the defroster in cool mode you compressor will run in the winter. Running it some year round does seem to help. Not a problem around here.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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