GLC63s, GLC63, GLC43 AMG SUV and Coupe (X253, C253) 2015 - Present

2024 GLC43 coolant level message

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Old Apr 4, 2025 | 08:16 AM
  #26  
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Originally Posted by aviator787
Relevance to coolant ?
Sorry for that and the confusion. I asked what loaner the other forum member got while the vehicle was in the shop and they answered.
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Old Apr 4, 2025 | 12:30 PM
  #27  
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24 amg 43 coupe
lol, and since this has a wee little bit to do with coolant, I just came home from the service department and was told for the first time in almost 3 weeks now that the new thermostat is not even in the car yet, they are on flushes 7&8 today, he asked me if they could drive it over the weekend, no, then told me after they are done flushing it the 8th time they will install the new thermostat, which is why I went there. I was like ok so whats really going on why is a thermostat failure needing 8 flushes and still has not been installed. it was sand, there was sand in the coolant system which is probably what caused the thermostat failure and why the radiators had to be replaced, yes plural "s" apparently there's more than one. I told him he had never told me this he insisted he had in text so I said ok lets review texts, he reads them all aloud and I said so where exactly do you think you mentioned debris or sand in the coolant so he scrolls back and reads them all aloud again then blankly stares at me as if hes made his point....frustrating. apparently when the engine was made they use sand to knock loose any metal shavings and they did not get it all out at assembly. Aviator, I know this probably has nothing to do with why your 43 is losing coolant but maybe it does somehow in that there could have been debris in system which could lead to various issues and I would imagine coolant loss could be one.

Last edited by Tchgrif; Apr 4, 2025 at 12:33 PM.
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Old Apr 4, 2025 | 12:46 PM
  #28  
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Originally Posted by Tchgrif
lol, and since this has a wee little bit to do with coolant, I just came home from the service department and was told for the first time in almost 3 weeks now that the new thermostat is not even in the car yet, they are on flushes 7&8 today, he asked me if they could drive it over the weekend, no, then told me after they are done flushing it the 8th time they will install the new thermostat, which is why I went there. I was like ok so whats really going on why is a thermostat failure needing 8 flushes and still has not been installed. it was sand, there was sand in the coolant system which is probably what caused the thermostat failure and why the radiators had to be replaced, yes plural "s" apparently there's more than one. I told him he had never told me this he insisted he had in text so I said ok lets review texts, he reads them all aloud and I said so where exactly do you think you mentioned debris or sand in the coolant so he scrolls back and reads them all aloud again then blankly stares at me as if hes made his point....frustrating. apparently when the engine was made they use sand to knock loose any metal shavings and they did not get it all out at assembly. Aviator, I know this probably has nothing to do with why your 43 is losing coolant but maybe it does somehow in that there could have been debris in system which could lead to various issues and I would imagine coolant loss could be one.
Molding sand? If so, that was an issue with the sedan as well.
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Old Apr 4, 2025 | 01:58 PM
  #29  
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Originally Posted by W205C43PFL
Molding sand? If so, that was an issue with the sedan as well.
I was told they use sand to clean out the engine casein, molding sand sounds more like sand mold for the actual engine casting so I do not know if these are considered the same thing but sand is present. they just called to say its still flushing sand out so probably wont be done with it till next Monday.
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Old Apr 4, 2025 | 03:41 PM
  #30  
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Originally Posted by Tchgrif
I was told they use sand to clean out the engine casein, molding sand sounds more like sand mold for the actual engine casting so I do not know if these are considered the same thing but sand is present. they just called to say its still flushing sand out so probably wont be done with it till next Monday.
I see, so I was specifically referring to this: https://www.reddit.com/r/AMG/comment..._molding_sand/
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Old Apr 4, 2025 | 05:08 PM
  #31  
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Originally Posted by W205C43PFL
I see, so I was specifically referring to this: https://www.reddit.com/r/AMG/comment..._molding_sand/
it's entirely possible they are lying to me and this is what is actually happening, see link. this car is 8 months old when code was thrown and the engines in the article were mostly from the year before but could MB still be making things shoddily, yes. time will tell. I really like this car a lot so I sincerely hope this is not whats actually going on.
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Old Apr 4, 2025 | 05:11 PM
  #32  
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Originally Posted by Tchgrif
it's entirely possible they are lying to me and this is what is actually happening, see link. this car is 8 months old when code was thrown and the engines in the article were mostly from the year before but could MB still be making things shoddily, yes. time will tell. I really like this car a lot so I sincerely hope this is not whats actually going on.
Hmmm fingers crossed this is not it. I guess you could also get a second opinion from another MB dealership.
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Old Apr 4, 2025 | 05:13 PM
  #33  
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Originally Posted by W205C43PFL
Hmmm fingers crossed this is not it. I guess you could also get a second opinion from another MB dealership.
If I ever get the car back and it again throws thermostat code I will be going to a different dealer/service
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Old Apr 4, 2025 | 05:44 PM
  #34  
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Originally Posted by Tchgrif
If I ever get the car back and it again throws thermostat code I will be going to a different dealer/service
Sounds like a plan.
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Old Apr 29, 2025 | 04:21 PM
  #35  
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2024 GLC43
Do we have 2 coolant reservoirs in the GLC43 ?
I checked with my mechanic and the fluid in the right hand side was also pink.


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Old Apr 29, 2025 | 04:52 PM
  #36  
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Originally Posted by aviator787
Do we have 2 coolant reservoirs in the GLC43 ?
I checked with my mechanic and the fluid in the right hand side was also pink.

https://cimg6.ibsrv.net/gimg/www.mbw...d7e0572101.jpg
Yes, many MBs have two, this is the norm. Just don't mistaken another brake fluid one as one of them though.
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Old Apr 30, 2025 | 07:32 AM
  #37  
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there is a diagram online of the reservoir on the right being the battery coolant system and the engine coolant reservoir being on the left.
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Old Apr 30, 2025 | 07:49 AM
  #38  
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Originally Posted by Tchgrif
there is a diagram online of the reservoir on the right being the battery coolant system and the engine coolant reservoir being on the left.
Interesting can you send....
Battery coolant ?
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Old Apr 30, 2025 | 08:02 AM
  #39  
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Originally Posted by aviator787
Interesting can you send....
Battery coolant ?
https://mbparts.mbusa.com/v-2024-mercedes-benz-glc43-amg--4matic--2-0l-l4-electric-gas/cooling-auxiliary-heating--battery-cooling-system?srsltid=AfmBOorTThx4AAHqrLM9YnHiIsyW9brbwXP ulEwYTNpEFRqQ7xjiHbnp

I goggled coolant system reservoir for 24
glc 43 and it popped up the two options, is how I found this

Last edited by Tchgrif; Apr 30, 2025 at 08:05 AM. Reason: more info
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Old Apr 30, 2025 | 04:27 PM
  #40  
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Seems linked to the radiator and no sign of the main one ?! Confusing how this works
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Old May 1, 2025 | 07:19 AM
  #41  
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Originally Posted by aviator787
Seems linked to the radiator and no sign of the main one ?! Confusing how this works
theres two radiators the schematic for the regular coolant system shows a bigger radiator, so there may be a total of three, high temp coolant, low temp coolant and battery coolant.also they replaced both of my radiators when the sand issue was being dealt with. schematic for high temp system 2024 glc 43 https://mbparts.mbusa.com/v-2024-mer...ooling-circuit

Last edited by Tchgrif; May 1, 2025 at 07:22 AM.
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