I did this work on a W126 including flushing the condenser, evaporator and lines. I had my indi recharge the system. Search on my the posts for my profile and you will see the amount I spent on it. Its not to bad to do on your own if you have the tools, time and patience.

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Current
1989 300SE - Siegfried
2010 Toyota Tundra Crewmax
2005 Honda CRV

Gone but not forgotten
2001 F150 Supercrew - The Screw
1966 Ford LTD 390 - The Big G!
1995 Mercury sable
1986 Subaru DL
1982 Ford EXP - my first car