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On my 560 it was the expansion valve...
I did a writeup on replacing the valve. You can find it at this link:
http://www.funnyyouasked.com/Mercedes/W126/ExpValve/removal_and_replacement_of_expan.htm
The part is not very expensive. It is imporant that you know how to empty and refill the system, which (by your post) I suspect you know. Figure about an afternoon.
Good luck!
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Henry Bofinger
1989 560 SEL (black/black)
2001 Audi TT Roadster (silver/grey)
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