E-Class Coupe (C207) & Cabrio (A207) 2010-: E250CDI Coupe, E350 Coupe, E350CDI Coupe, E500 Coupe, E550 Coupe [Coupes & Cabriolets]

Name or Part Number?

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Old Oct 23, 2025 | 04:05 PM
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Davery's Avatar
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2012 E550 Cabriolet 2011 VW Eos 1985 Pininfarina Spider
Name or Part Number?

I found the source of my very slow coolant leak. There is a line that goes from an expansion tank hose up to the top middle of the engine. There is a plastic T that is leaking. Does anyone know the name or part number of this?

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Old Oct 23, 2025 | 04:41 PM
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Bi-Turbo E550 Coupe (W207)
For full diagram here you go: https://classicparts.mbusa.com/v-201...and-components

If I had to guess I think it's: https://classicparts.mbusa.com/oem-p...ine-2782000900

I recommend you do all the turbo coolant lines at the same time. My independent repair shop did 2 lines in 2021, and the 3rd one burst open on the drive home, thankfully he did the last one for free since he felt bad that literally I drove off and all the coolant leaked again. Thats because it was brittle and no longer had the strength. So do all 3 turbo coolant lines at the same time is my recommendation. It's 14, 16, and 17 in the diagram. Whichever ones are the plastic ones, those are the ones to redo.

Here's another website with interactive diagram: https://www.mbpartsgiant.com/parts-l...iagram=5719816

Last edited by ibbij; Oct 23, 2025 at 04:52 PM. Reason: Added recommendation
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Old Oct 23, 2025 | 04:55 PM
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2012 E550 Cabriolet 2011 VW Eos 1985 Pininfarina Spider
It's not a turbo coolant line. It appears to be a recovery tank hose, part number 2782030417. I need to figure out if I can change it in the parking lot of my condo.

Last edited by Davery; Oct 23, 2025 at 06:22 PM.
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Old Oct 24, 2025 | 07:57 AM
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Bi-Turbo E550 Coupe (W207)
Originally Posted by Davery
It's not a turbo coolant line. It appears to be a recovery tank hose, part number 2782030417. I need to figure out if I can change it in the parking lot of my condo.
Yes that looks right, good luck with changing it.
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Old Oct 24, 2025 | 08:17 AM
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W212 E63S Wagon - GSL580 - E63 - E350 - C300
Originally Posted by ibbij
Yes that looks right, good luck with changing it.

Very easy swap out, very easy. What is common is for the 90 that goes into the engine will also be brittle and break. If that happens just take a soldering iron - melt out the old one and replace that as well. This is a sign that all of the smaller coolant hoses would like to be changed.
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