Thanks again All.

So it is under the metal 'dome' right. 3 bolts I see there, yes. "Terminates on top of engine" isn't that really the water pump? Just want to make sure I am in the right place! Alldata (which happens to have lousy directions for this procedure, by the way) says drain radiator. My fluid is recent so does not need to be changed. Do I really have to drain all the fluid or can I just let a little bit (how much?)? Also, where is best place to drain radiator?

ciao

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David
1986 300E Anthracite + ECodes + MB Mileage Award