I really hate this unfair attention.

I am preparing my shopping list for my E400 10th year rejuvenation , for the easier ones to do, other than timing chain cover for that hidden coolant flat seals x 2.

So coolant hoses is 1st line of defense.

When any of you face with the same issue like me, do take note of the actual hoses P/N on the engine and DO NOT rely on EPC.

I give 2 examples where even the latest 2023 EPC system of Mercedes Indonesia which is online to Germany, does not do better than my Ebay 2018 EPC/WIS
Meaning the E400 or M276.8 thingy....is not UPDATED too until now , DUGGHH !!!!


Hoses P/N can be tricky if the hose is a mix between aluminum pipe + rubber hose. The P/N on the hose itself often is not the true P/N of the complete hose+pipe set, but the hose only.
If all rubber hoses, it is easier and usually the P/N is the correct P/N.


Hose #1 . Physical on the car it is : A212 830 88 00




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If using EPC and my VIN number is inserted, I will get different P/N A212 830 04 00
Sometime different P/N can mean update P/N, but this is NOT A GUARANTEE unless you see instruction like REPLACED WITH P/N xxxxxx




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If I do not use my VIN, and instead use the chassis code of E400 sedan, which i s W212.065, I get the correct P/N, among the selections.





The part looks like this.



The coolant flow is as follows :
A is the return of coolant from HVAC heater core. So this is Input.
B is the return of the coolant after cooling the turbochargers (2), this is also Input.
C is the output of this hose, into the INPUT of the small baby 12VDC coolant pump, as shown on the photo earlier in the post.

A B03 start stop engine will use this "hose" to keep HVAC heater core warm by circulating coolant when engine is in STOP-OFF mode in traffic.


Now I tracked what does the wrong P/N A212 830 04 00 recommended by the EPC looks like ? , compared to the one on my car, P/N A212 830 88 00
Aha, the plastic Tee is shorter.




On my car, the long Tee for Hose #1 in discussion. Later I will explain the issue with Hose #2.




Can kindly E400 owners or M276.8 engine owners see if you guys get the long Tee or short Tee version ?
My car is a RHD , so a LHD car maybe different because your HVAC heater core + EVAP is at the LEFT of the firewall same as your steering location..
RHD car the HVAC heater core + EVAP is at the RIGHT side firewall, or same as driver steering.
The return hose from HVAC heater core for LHD vs RHD car will be different.


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Hose #2
In the EPC using my car VIN or using only chassis code W212.065, Hose 2 DOES NOT EXIST !!!!!




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By tracing Hose #2 P/N, I can find it in CLS400 and the one supposedly with 3.5 Liter version of M276 Turbo. The M276.850 .







.......... Welcome to EPC/WIS.


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Here is a glimpse of the UN-UPDATED data of Front SAM when for M276.8 engines and sometime because of RHD variant, which can make your head spin when using WIS wiring diagram auto llink feature.
I did a Front SAM tear down last year giving it conformal coating to prevent moisture on the computer board and I check each and every wire ( total 138 wires ) against the 10 pages of Front SAM.
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