S-Class (W223) 2021 to Present

Cooling System Malfunction Error Message

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Old Jan 27, 2026 | 08:48 AM
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Cooling System Malfunction Error Message

Got this error this morning while taking a buddy to the airport. When I got to the airport, I turned off the car, opened the driver's door, closed it, and started the car. Error did not reappear on the drive to work. Hopefully this is another glitch in the system and not indicative of a bigger issue. I'm driving to Charleston this weekend and don't want a "real" coolant issue between Atlanta and Charleston.

It was cold at the time, 16 degrees F, but coolant level was fine.

This has been reported in another forum here with lots of causes - Error message cooling system malfunction reduced drive performance - MBWorld.org Forums

Anyone with a W223 have the issue?


Last edited by Mem30306; Jan 27, 2026 at 08:54 AM.
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Old Jan 27, 2026 | 10:04 AM
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I had that happen once, and it never came back. Was last winter and it was when it was very cold.
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Old Jan 27, 2026 | 10:09 AM
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I have had this 4 times in the last 3 weeks. 1 time they bleed the system 2 time replaced both water pumps thermostat 3 time re bleed system and it is in the shop again for the 4th time waiting to hear so I can start the buy back process
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Old Jan 27, 2026 | 10:16 AM
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Originally Posted by bradsl2000
I have had this 4 times in the last 3 weeks. 1 time they bleed the system 2 time replaced both water pumps thermostat 3 time re bleed system and it is in the shop again for the 4th time waiting to hear so I can start the buy back process
Geezus! - That sucks @bradsl2000 I hope that's not what's going on with mine.
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Old Jan 27, 2026 | 12:28 PM
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2 times in the last 3 weeks. My message; Coolant Low Refer to owners manual. Went away each time when restarting.
Had it in for A service last week. Mentioned to SA but they found nothing.
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Old Jan 27, 2026 | 12:40 PM
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Originally Posted by pippen990
2 times in the last 3 weeks. My message; Coolant Low Refer to owners manual. Went away each time when restarting.
Had it in for A service last week. Mentioned to SA but they found nothing.
I used to get that message in my 2018 E63 quite often. I would take by the dealership and have them top off the coolant. In fact, it was such a known issue they had a bottle of coolant in the service bay for this very purpose. However, if they didn't find that the coolant level was low during your A service, then maybe just a glitch.
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Old Jan 28, 2026 | 09:22 AM
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Had the same message on my S580 this summer. I stepped into the garage to input Toll Service billing information for a drive to Seattle. The moment the key was sensed by the vehicle there was an enormously loud roar from the radiator fan. I got in and the error message on the screen. Eventually, the radiator fan turned off. The strange thing is the car had been sitting al night in the garage so no reason for the cooling fan to start up.

Dealership where it was purchased said to keep an eye on it. We opted to make a pit stop in Spokane, shout out to the dealership. Their tech tore into it and discovered that one of the antifreeze reservoirs (the vehicle has two) was down by a cup. He gave me instructions for checking both reservoirs should it happen again. It never has.

JR
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Old Jan 29, 2026 | 09:02 AM
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Originally Posted by WEGJR
Had the same message on my S580 this summer. I stepped into the garage to input Toll Service billing information for a drive to Seattle. The moment the key was sensed by the vehicle there was an enormously loud roar from the radiator fan. I got in and the error message on the screen. Eventually, the radiator fan turned off. The strange thing is the car had been sitting al night in the garage so no reason for the cooling fan to start up.

Dealership where it was purchased said to keep an eye on it. We opted to make a pit stop in Spokane, shout out to the dealership. Their tech tore into it and discovered that one of the antifreeze reservoirs (the vehicle has two) was down by a cup. He gave me instructions for checking both reservoirs should it happen again. It never has.

JR
I was going to post; It is I believe the turbo coolant reservoir located underneath the vanity cover. It happened to me as well.
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Old Jan 29, 2026 | 09:19 AM
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I got the message the other day on the way to airport, but not since. Road trip to Charleston this afternoon - so hopefully a glitch and nothing more.
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Old Jan 29, 2026 | 09:56 AM
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Originally Posted by DonS550
I was going to post; It is I believe the turbo coolant reservoir located underneath the vanity cover. It happened to me as well.

That’s what the Spokane tech showed me. I didn’t remember what it was for only that it was quite sensitive to slight drops in fluid level.
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Old Jan 31, 2026 | 08:44 AM
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I got this message last night driving home from dinner. It was about 12 degrees (VERY cold for here). Drive was unaffected, temp was right where it should be. Got home and shut down then got back into it to take my Mom home since she was watching our kids, no message and no issues.

Who knows
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Old Jan 31, 2026 | 03:30 PM
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Just got my car back this morning after a week in the shop. They replaced the 48volt battery and flushed the system 3 times. Assured me it was resolved. Put 45 miles on it on the drive home and got the message again. returned it to dealer. I give up but I love the car
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Old Jan 31, 2026 | 03:46 PM
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That’s crazy!
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