Suggestion: you might try posting in the Diesel Discussion subforum. I'm a short-time 300D owner, and as such won't presume to best be able to answer all your questions, but the collective experience there is substantial.
Before doing so, I would recommend that you spend a little time using the forum search function to search existing threads in the Diesel Discussion. Any number of people have been down the "running too hot" road, and will have dealt with the same sort of troubleshooting issues.
It also might help if you could provide some more details, i.e., does it do this at idle, or only under heavy load, or only when the AC is running? Did the problem occur abruptly, or is it something that has been gradually getting worse over time? Any maintenance or repair history for the car? How high is "way past 100" (opinions vary on how hot is too hot)?
-- eskimo
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