C63 AMG (W206) 2022 - (Upcoming AMG)

C43 Coolant Block Issues

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Old 09-29-2023, 11:06 AM
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Exclamation C43 Coolant Block Issues

Figured this would be important to note,

As per reddit poster:

"We currently have 2 2023 c43s at our shop experiencing this same problem. Production of the block led to some casting material being left inside of it. There is a process to correct this issue. We are having to filter the coolant to get the material out of the vehicle. It’s a fairly long process in that if your shop is doing it correctly it will take multiple days to clean out, there’s multiple heat and cool cycles the engine needs to go through before we know for sure that all the debris is gone."

It appears this can clog the thermostat and not allow coolant to properly absorb heat / cool the engine, resulting in reduced performance. If the dealer initially replaces only your thermostat, it's possible it will happen again.
Old 10-08-2023, 06:28 PM
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Originally Posted by Adi-Benz
Figured this would be important to note,

As per reddit poster:

"We currently have 2 2023 c43s at our shop experiencing this same problem. Production of the block led to some casting material being left inside of it. There is a process to correct this issue. We are having to filter the coolant to get the material out of the vehicle. It’s a fairly long process in that if your shop is doing it correctly it will take multiple days to clean out, there’s multiple heat and cool cycles the engine needs to go through before we know for sure that all the debris is gone."

It appears this can clog the thermostat and not allow coolant to properly absorb heat / cool the engine, resulting in reduced performance. If the dealer initially replaces only your thermostat, it's possible it will happen again.
Seems significant, hopefully it only affects a small portion of vehicles. I wonder if there will be a recall for the affected portion?
Old 02-11-2024, 02:51 PM
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Originally Posted by W205C43PFL
Seems significant, hopefully it only affects a small portion of vehicles. I wonder if there will be a recall for the affected portion?
same issue here. Mine was made in South Africa. Wonder if the others were too.
Old 02-20-2024, 12:59 PM
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Same issue

Got my c43 in December 2023 with 3200 miles on it, seems to have same issue as everyone else thermostat replacement and engine cycling needed. Dropped off beginning of Feb and haven’t received it yet. Hopefully it will return this week. Hoping this isn’t a long term issue love the car other wise.
Old 02-20-2024, 10:29 PM
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Is this why there is so many slightly used c43s for sale? In my area alone I saw about 15 c43s with less than 7k miles on them for sale.
Old 02-23-2024, 11:22 AM
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Originally Posted by agilbreath
same issue here. Mine was made in South Africa. Wonder if the others were too.
I believe SA is where all the W206's are made.
Old 02-27-2024, 02:57 PM
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My understanding is the cars are assembled and made mostly in SA but the engine and trans are assembled in Germany. Please correct me if I am in error.
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Old 02-28-2024, 11:25 AM
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Originally Posted by eatmydust
Is this why there is so many slightly used c43s for sale? In my area alone I saw about 15 c43s with less than 7k miles on them for sale.
Many likely were loaner cars.

Originally Posted by mischief
I believe SA is where all the W206's are made.
No, primary production for the C Class is in Bremen Germany. South Africa is the second largest production plant for the W206, and where all US market cars (including AMGs) are built. W206s are also produced in smaller quantities in China and I believe India and maybe via knock down kit in certain other south east asia countries (thailand, malaysia, indonesia) where local labor is exremely cheap but tax incentives for local market cars make cars built out of country insanely expensive (I'm talking 300% tax if the car isn't assembles locally).

Last edited by BenjaminKohl; 02-28-2024 at 11:29 AM.
Old 03-21-2024, 07:54 PM
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Originally Posted by BenjaminKohl
Many likely were loaner cars.


No, primary production for the C Class is in Bremen Germany. South Africa is the second largest production plant for the W206, and where all US market cars (including AMGs) are built. W206s are also produced in smaller quantities in China and I believe India and maybe via knock down kit in certain other south east asia countries (thailand, malaysia, indonesia) where local labor is exremely cheap but tax incentives for local market cars make cars built out of country insanely expensive (I'm talking 300% tax if the car isn't assembles locally).
They do amg models for loaners?? Wow. Never got that when I got loaners.
Old 04-22-2024, 11:57 AM
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My car is in the shop for the same reason. Have you guys had the issue reappear after they fixed it?

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