Went to drain the coolant in my ,87 SDL last night and found that there was no drain on the lower Radiator housing. I mean none, not even a bolt or bushing.
The rad. is a replacement OE Behr that was installed by the PO in 2000.
I had to remove the lower Rad. Hose to drain the coolant - very messy
The manual shows a drain plug but it definitely wasn't there on mine.
Has anybody else come across this

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown

I've got what appears to be a replacement Behr in the SDL (installed by PO) and it does have the drain.

Are you sure you are looking for the right thing? It's a plastic threaded piece that is recessed in a cavity. You have to get underneath the vehicle to see it. I seals with an o-ring (that I now believe has to be replaced on mine. )

The first time I drained mine it took a little looking to find it. It seemed like the sheet metal under the radiator had been bunged up a little so the access hole for the drain wasn't exactly centered on the drain anymore. Maybe that is the case with yours??

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Keep everything as simple as possible-but no simpler--Albert Einstein

It's usually very blue in color.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)