HGV,

I'll take a look. I wonder if that part is the vacuum modulator. It would make sense.
I hear you on the overheating. That's the one thing I did hear prior to looking at this. I guess it's the aluminum head. The temperature was well within limits and the PO said he carried a coolant mixture in the trunk just to make absolutely sure that he didn't get stuck. He didn't have any problems with it, but I did like the attention to prevention.

- Ted

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1987 300SDL 265,000 mi.
1982 300SD 325,000 mi. (and holding)
1956 Packard Clipper 150,000 mi.