Ive seen both ideas published about whether you need barrier hoses for R134a. You do need it for R22. The industry info says that if your hoses were used with R12. You don't have to replace them. The mineral oil seeps into the hose and creates a barrier that will not allow the R134a to leak through the hose. So you don't have to replace the hoses as long as they were not leaking.
If your compressor has had the black death
http://www.ackits.com/index.cfm?fuseaction=Black%20Death
You will have to COMPLETELY flush the AC system, replace the R/D and the expansion valve which will be blocked due to the black death. If going to all this work put in inline filters between the compressor and the condenser as well as between the R/D and the expansion valve. This will prevent any particles that you may have missed in your flushing to cause blockage or damage again.
Dave
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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car
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