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I'll second the suggestion; put briefly, Swagelok rules!
I was first exposed to the fittings while working in the nuclear industry; holds leak-free under high pressure, joints are capable of being disconnected & reconnected with no loss of sealing capability, and they come in a staggering array of sizes (metric and inch) & materials (nylon, PTFE, brass, aluminium, carbon steel, stainless steel, titanium, etc.) The fittings use a 2-piece ferrule, made to exacting specs; no torque is placed upon the tubing when installing.
They also have various adapters, hoses, etc. The hoses are either teflon with a 340 stainless steel overbraid (may be too porous for A/C over the long term) or corrrugated 316L stainless steel with a 321 stainless steel overbraid; order with tube fittings on both ends, and you'll be able to attach it to the existing tubing after cutting out the bad section (assuming you have sufficent straight sections of tubing to attach it to). Custom hoses may be pricey, but will be much less than what the dealer wants to charge you!
The website is www.swagelok.com; I'm fortunate enough to live not far from a regional supplier, so I make extensive use of the stuff (even have a hard-copy catalog). I'm not sure if you can order direct from the web site; if not, get the part numbers you need, then try Denver Valve & Fitting at 303-232-8844. (No connection except being a happy customer...)
Follow the installation instructions as given (nut finger-tight, then one and a quarter more turns to seat the ferrule); overtightening them will gain nothing, and may cause galling & subsequent leaks.
Volvo content: I use Swagelok fittings on the oil lines to & from the ultra-filtration oil bypass filter on my 740 (no leaks, no worries).
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Tom Harper ('86 740GLE, NØMKC)
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