Thank you Joe and Steve!! Went out and checked it, and sure enough, there was hardly any space between the top of the fan and the shroud. I adjusted it, to where now there is plenty of space. I haven't driven it yet, but judging from the scrape marks on the fan blades...that was the problem! I had the shroud off, and I guess I just wasn't thinking about clearance when I put it back on.

Thanks again!

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'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.

"A Mercedes-Benz is like a fine wine, it only gets better with age."