Yup. Initially they tested r134a with new r12 hoses and it leaked like a sieve , hence the hose change recommendation, than after a bunch of cheapie conversions were done, they discovered that r12 hoses saturated with mineral oil didn't leak in most cases so they dropped the recommendation. There are a few vehicles that have had problems with the high side hose between the compressor and condenser giving out after a while, so some manufacturers still recommends changing that hose out during a conversion I've personally never run across a seeping hose ( and I go over every system with a sniffer ) but I've had plenty of compressor seals start leaking like crazy after conversions, to the point that I strongly suggest that I put a new compressor in on any that come through for the conversion, and if they don't , I let them know ahead of time roughly what it is going to cost for seasonal recharges so they can figure it in. If doing your own recharges, it doesn't cost much, but for folks having to pay for it, it adds up to more than just having the compressor done after a few years.
I've also run across tons of leaking old orings. When installing new orings on an r134a system, DO NOT coat them with ester or pag oil, it will dry them out and cause leaks and other problems. you need to get a jug of r12 mineral oil to coat new orings with , even on a r134a system. check around on price, it usually only comes in qt cans and most local places want near $30 for it, Oreilly's has it for around $12 --------Robert Kaleb C. Striplin, work wrote: > Well from what I have always been told when a system is converted to R134 > from R12, the oil from the R12 over the years forms a natural barrier inside > the hoses. > > --- > Kaleb C. Striplin > Cox Auto Trader > 730 PP Supervisor > > ----- Original Message ----- > From: "Tom Hargrave" <[EMAIL PROTECTED]> > To: "'Mercedes Discussion List'" <mercedes@okiebenz.com> > Sent: Monday, July 09, 2007 7:51 AM > Subject: Re: [MBZ] Slow A/C leak 240D > > > >> The O-rings are just one issue. Some of the R12 lines are porous to R134A. >> If this is the case then the R134A will slowly bleed through the lines, >> leaving the oil behind since the oil can't pass through. >> >> Thanks, >> Tom Hargrave >> www.kegkits.com >> 256-656-1924 >> > > > _______________________________________ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
