One additional post to further complete this item.

I charge the system, and I knew there was a reason I use R134a initianally. I had the schrader valve in the low side fail when I removed the hose. Lost all the R134a. Glad that wasn't $100 worth of R12.
Also had a leak at one fitting. Tighten it installed the oil I lost and charged it with R134A again. So far the cars AC has been running very well. I charged to the point that the vent temp stopped dropping. I'll see when it gets above 100 degrees if the charge is correct.
So far the car has been very comfortable.
I'll keep you posted this summer.

Dave
7709

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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