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Mystery part in front left of engine bay (picture identification mystery)

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Old Feb 19, 2025 | 10:46 AM
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2005 S500 Designo
Mystery part in front left of engine bay (picture identification mystery)
Found in the front left of the engine bay, W215 CL-Class, M275 V12 engine.

It looks like some sort of vent device or one-way valve?



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Old Feb 20, 2025 | 08:51 AM
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W212 E63S Wagon - GSL580 - E63 - E350 - C300
That looks very much like the two plugs I just got for my water pump.
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Old Feb 20, 2025 | 11:04 AM
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2005 S500 Designo
Originally Posted by OldManAndHisCar
That looks very much like the two plugs I just got for my water pump.
Woah. I'm chasing a mystery coolant leak right now. Pressure tested the system and found nothing.
Do you have a part # or anything else?
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Old Feb 20, 2025 | 12:16 PM
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2005 S500 Designo
It is definitely some sort of one-way valve that relieves positive pressure
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Old Feb 20, 2025 | 12:23 PM
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2005 S500 Designo
More pictures:





It looks like the plastic clips holding it in the middle broke off causing it to pop out.
Maybe a part from the radiator? An air valve? I just pressure tested and vacuum tested the cooling system and found no issue.
Last edited by Fried Chicken; Feb 20, 2025 at 12:24 PM.
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Old Feb 20, 2025 | 12:47 PM
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
Yours looks a ton like this one....

https://www.fcpeuro.com/products/mer...lug-0009985590

Mine are -
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Old Feb 20, 2025 | 02:16 PM
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2005 S500 Designo
That looks very close, but the top on mine is flat. Checking pictures of the pump on eBay I don't see one for the M275 engine.

But it must be something. I looked hard and couldn't find anything in the suspicious area; granted it's cramped in there.
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Old Feb 20, 2025 | 03:29 PM
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S550 V8, CL600 V12, SLK32 AMG


URO Parts 30681138 Differential Filter.
Anyone in the house own a Volvo?
Last edited by waterzap99; Feb 20, 2025 at 04:01 PM.
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Old Feb 20, 2025 | 05:24 PM
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2005 S500 Designo
Originally Posted by waterzap99


URO Parts 30681138 Differential Filter.
Anyone in the house own a Volvo?
How on earth did you find that??

How would this end up in my front underbelly?
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Old Feb 20, 2025 | 05:27 PM
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
I used to want to leave some random part on a work bench at a shop.....just to watch.
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Old Feb 20, 2025 | 05:37 PM
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S550 V8, CL600 V12, SLK32 AMG
Maybe someone was messing with you, or maybe it fell off a car on the road and your car picked it up ? Very strange.
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Old Feb 20, 2025 | 08:30 PM
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Originally Posted by Fried Chicken
How on earth did you find that??

How would this end up in my front underbelly?
Perhaps reverse image search helped or something. google lens or right click search google for image.
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Old Feb 21, 2025 | 09:04 AM
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2005 S500 Designo
Originally Posted by waterzap99
Maybe someone was messing with you, or maybe it fell off a car on the road and your car picked it up ? Very strange.
😐

this is quickly going from a mechanical problem to an investigative one... mmk
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Old Feb 21, 2025 | 09:06 AM
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2005 S500 Designo
Originally Posted by OldManAndHisCar
I used to want to leave some random part on a work bench at a shop.....just to watch.
That's the sort of terrorism Bush the II was obsessed over
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Old Feb 28, 2025 | 04:18 AM
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W220 S500
I think it might be off the cooling fan for the radiator. It is a vent for the ECU that drives the fan, mounted on the fan pack.
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Old Feb 28, 2025 | 10:11 AM
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2005 S500 Designo
Originally Posted by AdamGdefender
I think it might be off the cooling fan for the radiator. It is a vent for the ECU that drives the fan, mounted on the fan pack.
Boom, this might be it! Wow good job. Location tracks as well. I'll see if I can find it.
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Old Feb 28, 2025 | 11:39 AM
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Originally Posted by AdamGdefender
I think it might be off the cooling fan for the radiator. It is a vent for the ECU that drives the fan, mounted on the fan pack.
Originally Posted by Fried Chicken
Boom, this might be it! Wow good job. Location tracks as well. I'll see if I can find it.
So Volvo uses the same exact part? Since someone used image search and found a Volvo part.
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Old Feb 28, 2025 | 11:56 AM
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Actually, answering my own question, aam not surprised, for example Volvo uses the same vacuum pump for turbocharged engines so the brands do have the same OE/supplier for various parts and so does Ford: https://mbworld.org/forums/w212-amg/...ve-repair.html
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Old Feb 28, 2025 | 01:24 PM
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Mercedes
Originally Posted by W205C43PFL
So Volvo uses the same exact part? Since someone used image search and found a Volvo part.
most cars use parts from major suppliers like Bosch , Valeo etc . Mercedes doesn’t make everything specific to Mercedes only

thats why the same Bosch fuel injection system of the 1990s was found in rolls Royce , Ferrari , Mercedes , Porsche etc
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Old Feb 28, 2025 | 07:47 PM
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Originally Posted by tusabes
most cars use parts from major suppliers like Bosch , Valeo etc . Mercedes doesn’t make everything specific to Mercedes only

thats why the same Bosch fuel injection system of the 1990s was found in rolls Royce , Ferrari , Mercedes , Porsche etc
That I understand but didn't know they share parts across so many brands.
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Old Mar 1, 2025 | 10:12 AM
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There is a huge universe of "parts" manufacturers. There will be a dozen companies that make plastic plugs and caps for the industry, and no auto manufacturer will make their own, just as one example. Just for fun and education, google plug and cap manufacturer.
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Old Mar 1, 2025 | 10:15 AM
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Originally Posted by wallyp
There is a huge universe of "parts" manufacturers. There will be a dozen companies that make plastic plugs and caps for the industry, and no auto manufacturer will make their own, just as one example. Just for fun and education, google plug and cap manufacturer.
Thank you.
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Old Mar 1, 2025 | 11:14 PM
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2005 S500 Designo
And here it is (from a parts fan I have):



Well. ****ing. Done. AdamGdefender! You get a Cookie!
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Old Mar 2, 2025 | 08:04 AM
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Originally Posted by Fried Chicken
And here it is (from a parts fan I have):



Well. ****ing. Done. AdamGdefender! You get a Cookie!
Woo hoo! did you investigate how the part fell/broke off and why?
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Old Mar 2, 2025 | 10:32 AM
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2005 S500 Designo
Originally Posted by W205C43PFL
Woo hoo! did you investigate how the part fell/broke off and why?
Not yet, this is off a parts fan that I fried with water.
I'm going to look when I get the next opportunity but am not currently in a rush.
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