Hey folks:

I have a 2016 W212 and been having some trouble finding a replacement for the rubber boot that holds the auxiliary water pump, which attaches to the front of the coolant expansion tank.

The one on my car cracked and split, and now the pump's loose. I found a part # stamped on the holder itself, but can't seem to find a replacement anywhere. It's A2118350028

Has anyone replaced this bit, and if so, where'd you find it. FCPEuro and ECSTuning don't seem to have it.

Any help would be greatly appreciated.

 

Your AUX-Pump + holder maybe sold as one complete unit.

What is pulling the pump down so much??

 

Not sold separately from the DC pump itself which if for my car is called A2048350364 circulation pump
That P/N A2118350028 does not exist in EPC. This is common, even my radiator printed P/N on the body is not available in EPC.
Its like some P/N is between MB to its Vendor only and not for us retail customer.






Do some Macgyver fix on the rubber holder





This year 2026, me from Indonesia can not access anymore USA official MB dealers online website like :
mbonlineparts.com , mbdirectparts.com and the like , you try there the A2118350028
Probably I will need a VPN

 

might have some luck if you can chase down a Vemo# V99-16-0003

 

So far, no luck. but at S-Prihadi's suggestion, gonna MacGyver a fix.

Pulled the part out, cleaned it, and used some IPA on the mating surfaces. Then, I applied some vulcanizing rubber cement and held it in place with a binder clip while it cures.

Crossing my fingers that it works!!

 

Unfortunately, that did not work.

I contacted Mercedes-Benz and was told that the part is not sold separately from the pump and was recommended to try pick-n-pull.

I had started to 3d model a replacement I would print in TPU and used Makerworld to take a picture of the existing part, and had a pretty good 3d-model, but decided i would check the pick-n-pull first.

Got lucky, found two wrecked 2014's that both had what i needed, one was also cracking but the other one looked good. Cost me $8.40 and fit just right.

Thanks all for your help.