I finally got my expansion valve changed out and the details are on this other thread:

http://www.peachparts.com/shopforum/diesel-discussion/283700-bad-expansion-valve-cause-intermittent-ac.html?posted=1#post2544653

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Treiberg's Collection: 1981 240D, 1985 300SD, 1992 300E, 1997 E300D, 2005 C230K