I posted earlier today about a sulfur smell in my car, and i did more research and found this post in an archive from Oz Bricks, another board.. but it was archived and the replies didn't seem to address the confluence of the 2 problems. (and unfortunately there's no email address to contact this person by!!!)

I have the same issue, 2 weeks ago my coolant tank leaked until the light came on, and now I suddenly have the sulfur in exhaust problem. Can you think of how the 2 issues are related? My experience is exactly like the following:

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Here's the story....
About 2 weeks ago, my engine cooling warning light came on. I looked under the hood, and my coolant resevoir was almost empty. I noticed that the cap
was completely cracked so I replaced it and refilled the resevoir w/ fluid. The Volvo dealer said it was the obvious cause of the coolant loss and it should be
fine. The engine never overheated...I noticed the temperature gauge remained normal. The light never came back on over the past two weeks. Today,
however, I was driving home and the check engine light came on. All gauges looked fine, but I noticed an awful rotten egg smell coming from the exhaust (so
did everyone outside!). When I got home, it stunk the whole garage up. The check engine light stayed on. I let it sit for about an hour and restarted
it....same thing.
Is this a cooling problem still?
Should it not be driven at this point?
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One other thing is that my turbo seems to be whining more than usual.. all other fluids seem OK.

Thanks VERY MUCH for any insights you can offer...