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I don't know anything about the 3.2 engine but I can tell you that the box in my 2.4 non-turbo HAS a vacuum control diaphragm which is integral to the box. So when the diaphragm cokes up and fails it necessitates the replacement of the box.
But the 2.5T has NO diaphragm or any other mechanical parts within it. So the diaphragm style may be used only in non-turbo engines??? Just a guess.
I see no reason to replace the box on a 2.5T as long as you can get it, along with all associated hoses and engine passages, thoroughly flushed out with carb cleaner or the like. There will be some crud built up inside the two ports going into the engine block. Try to carefully dig them out rather than pushing the crud into the engine block. Loosen the oil filler cap and make sure you can blow a healthy volume of air through those ports.
The achilles heal on the 2.5T PCV systems seems to be a small "nipple" fitting, as Volvo calls it. The original uses a section of hard plastic tubing that becomes brittle with age and nearly impossible to clean out without breaking it. See part #15 in this diagram (P/N 9202208):
https://www.volvopartswebstore.com/showAssembly.aspx?ukey_assembly=239388&ukey_make=865&ukey_model=12010&modelYear=2005&ukey_category=7072&ukey_driveLine=11324&ukey_trimLevel=24651
I see in the diagram that it may be somewhat re-designed from what I recall. Maybe it will now last longer before clogging up.
It bolts to the underside of the intake manifold via a banjo bolts and is the piece that provides vacuum to the PCV system. The "U" shaped tube is a coolant passage that is supposed to keep the vacuum tubing good and warm so that the crud doesn't solidify in the vacuum tubing. Once again, short haul driving is not your friend.
The 2.5T would be a fantastic engine if it weren't for the lame PCV system. So you'll have to settle for simply having a "really good" engine. :)
Good luck and sorry for the long ramble.
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (STILL not road worthy!)
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