LPT should be less than 10 psi.
Matthews Volvo site has a good tutorial on replacing the piping for the PTC
"Is there be an O-ring that seals the compressor housing to the main body?" I don't understand the question.
I would ignore Seafoam to clean the intake unless you know the valves are extremely dirty. An Italian "tune up" works just fine. Just remember, 5500 rpm in 2nd gear = 55mph.
So long as the vacuum hose has the same inside diameter as stock.
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Keeping it running is better than buying new
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