EQE SUV (X294) Forum for Discussion of EQE SUV

Cooling System Malfunction

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Old Feb 4, 2024 | 09:26 AM
  #1  
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C63
Cooling System Malfunction

Anyone else seeing this error?

Dealer says the car needs a new part - but no guidance on what. 3 weeks and waiting … still driving the vehicle.



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Old Feb 4, 2024 | 09:40 AM
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That's pretty odd. Wonder if it's some sort of valve in the coolant loop that is used for heat pump, heat exchanger, etc. Though I'd assume that would be more catastrophic and would disable the vehicle. Whatever it is, I'm sure the car will do its best to stay within thermal limits and preserve your battery. Please keep us posted on what it was - did they tell you the part number? Would be interesting to look it up.
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Old Feb 4, 2024 | 11:59 AM
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Sounds familiar.. if only there was a big search box in the upper right hand corner of this site and I typed "cooling malfunction" into it maybe I could get a clue... but alas. :P
https://mbworld.org/forums/eqs-suv/8...rformance.html
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Old Feb 4, 2024 | 12:22 PM
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Originally Posted by Crito
Sounds familiar.. if only there was a big search box in the upper right hand corner of this site and I typed "cooling malfunction" into it maybe I could get a clue... but alas. :P
https://mbworld.org/forums/eqs-suv/8...rformance.html
This is an EQE - but thanks Tips.
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Old Feb 4, 2024 | 12:27 PM
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Originally Posted by tuffcalc
This is an EQE - but thanks Tips.
Oh, well, that's completely different then. No clues to find here.
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Old Feb 4, 2024 | 12:29 PM
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Originally Posted by bytemaster0
That's pretty odd. Wonder if it's some sort of valve in the coolant loop that is used for heat pump, heat exchanger, etc. Though I'd assume that would be more catastrophic and would disable the vehicle. Whatever it is, I'm sure the car will do its best to stay within thermal limits and preserve your battery. Please keep us posted on what it was - did they tell you the part number? Would be interesting to look it up.
Was wondering if someone had part information myself.

I’ll report back. No feedback from the dealer on parts ordered yet.


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Old Feb 4, 2024 | 12:31 PM
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Originally Posted by Crito
Oh, well, that's completely different then. No clues to find here.
Another great tip. Definitely needed your input to realize that a cooling flap situation on an EQS is different than this situation.

You’re great.
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Old Feb 4, 2024 | 01:30 PM
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I wonder if it's the servo-controlled cooling slats on the front? I noticed when it was really cold and covered with ice, my sedan made a crunching noise as the slats opened and closed during the charge initiation. If that servo is stuck, it could reduce cooling during DCFC. Simple fix, but annoying of course.
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Old Feb 4, 2024 | 01:33 PM
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Originally Posted by bytemaster0
I wonder if it's the servo-controlled cooling slats on the front? I noticed when it was really cold and covered with ice, my sedan made a crunching noise as the slats opened and closed during the charge initiation. If that servo is stuck, it could reduce cooling during DCFC. Simple fix, but annoying of course.
Could be. I checked them yesterday and they are open when the car is off (not sure if this is the default position or not).

The slates don’t move if I put any pressure on them.

I have noticed no adverse affects just yet with the error. Hoping dealer “parts” come in soon.
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Old Feb 4, 2024 | 03:17 PM
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When you plug in your level 2 EVSE (I'm sure it also does it with DCFC), head to the front quickly, you'll see the slats close and open. If your garage is quiet, you'll hear the servo as well. When we had snow and cold temps, some ice had formed on the mechanism after a car wash. The servo is quite strong though. Curious if yours is working as described. Do post the job notes when your repair is done!
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Old Feb 4, 2024 | 05:21 PM
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Originally Posted by bytemaster0
When you plug in your level 2 EVSE (I'm sure it also does it with DCFC), head to the front quickly, you'll see the slats close and open. If your garage is quiet, you'll hear the servo as well. When we had snow and cold temps, some ice had formed on the mechanism after a car wash. The servo is quite strong though. Curious if yours is working as described. Do post the job notes when your repair is done!
Just checked. The slats don’t move at all when I plug in (level 2) - they are wide open. Could be the issue (bad servo). Will keep you posted.
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Old Feb 4, 2024 | 06:22 PM
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Originally Posted by tuffcalc
Just checked. The slats don’t move at all when I plug in (level 2) - they are wide open. Could be the issue (bad servo). Will keep you posted.
It usually takes 15-20 seconds before they start moving. If not, then you're lucky if that's the issue. It closes at higher speeds to improve aerodynamics. If they're stuck open, that's a good thing for cooling. The car assumes that something's wrong, so it may affect charging performance on DCFC a small bit. Looks like it failed safe, so good on MB for designing it that way. Either way, this is most likely the issue and is very minor. I was wondering if that would run into problems, seems like it may be a point of failure on the cars. Honestly not sure how much it really affects aerodynamics.

Last edited by bytemaster0; Feb 4, 2024 at 06:27 PM.
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Old Jun 24, 2024 | 03:34 PM
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EQE 350+ SUV
Hello, i have the same problem with my EQE 350+ SUV, have they already fixed it for you? Did the warranty cover it?
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Old Aug 24, 2024 | 08:09 PM
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Coolant Mafunction

Originally Posted by tuffcalc
Anyone else seeing this error?

Dealer says the car needs a new part - but no guidance on what. 3 weeks and waiting … still driving the vehicle.


My 2024 GLC300 did this today. Opened passenger door and engine fan came on and the coolant malfuction warning and engine light came on. I had not even driven it since day before. I drove it to an appointment and my car would not turn off. It said that function is not available. So, I left it running until it switched off on its own. Got back in a few hours later and just engine light was on. I had it towed to dealership. Only had it a few weeks. Waiting for answer Monday hopefully. Didn’t over heat and drove fine- strange
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Old Aug 28, 2024 | 01:41 PM
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Originally Posted by Belfren
Hello, i have the same problem with my EQE 350+ SUV, have they already fixed it for you? Did the warranty cover it?
Yes covered under warranty. One of the cooling flaps in the front grill (bottom middle) got stuck in the open position so it threw that error. I think they changed the flaps and motor running the flaps.
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Old Feb 27, 2025 | 09:24 AM
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Originally Posted by tuffcalc
Yes covered under warranty. One of the cooling flaps in the front grill (bottom middle) got stuck in the open position so it threw that error. I think they changed the flaps and motor running the flaps.

Are the cooling flaps unique to the electric vehicles? My conventional C300 put up the same dialog box. Currently at the dealer since Tuesday, no updates yet.
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Old Feb 27, 2025 | 09:42 AM
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Originally Posted by bevandmichael
Are the cooling flaps unique to the electric vehicles? My conventional C300 put up the same dialog box. Currently at the dealer since Tuesday, no updates yet.
It might have it too.
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Old Feb 27, 2025 | 10:36 AM
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Same thing with my EQB300. Replaced flaps. Changed out entire cooling system and cleared battery errors. Dealer actually wanted to replace battery but MB wouldn't approve. But car has actually gone 3 months without a repair so that is a record for this piece of trash car.
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Old Feb 27, 2025 | 11:02 AM
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Perhaps the electrically controlled flaps is part of MB's goal of being more aerodynamic, so it shuts it off when cooling isn't needed? Failing grille flaps is not a new thing in the automotive industry so in MB's defense, bmw had failing grille flaps too.
https://g05.bimmerpost.com/forums/sh....php?t=2044553
https://g20.bimmerpost.com/forums/sh....php?t=2085511
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Old Feb 27, 2025 | 11:03 AM
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Since MB only recently started using grille flaps (I think, please correct me if I am wrong, thank you), and not sure if they use the same supplier as bmw.
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Old Feb 27, 2025 | 12:57 PM
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The flaps aren't just for aerodynamics - there are times you don't want to cool the battery and drivetrain in colder temperatures, so they should remain closed. W205 C-class from 2015 featured them in combustion cars, and of course EVs have it as well.
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Old Feb 27, 2025 | 01:03 PM
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Originally Posted by bytemaster0
The flaps aren't just for aerodynamics - there are times you don't want to cool the battery and drivetrain in colder temperatures, so they should remain closed. W205 C-class from 2015 featured them in combustion cars, and of course EVs have it as well.
Are we talking about the same flaps, there are none of those grille flaps on the W205 as far as what I seen.
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Old Feb 27, 2025 | 02:00 PM
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Originally Posted by W205C43PFL
Are we talking about the same flaps, there are none of those grille flaps on the W205 as far as what I seen.
They are (or were) on the luxury variant in 2015-2019, I think, called "Lamellas". The EVs just have them at the bottom.
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Old Feb 27, 2025 | 04:27 PM
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Originally Posted by bytemaster0
They are (or were) on the luxury variant in 2015-2019, I think, called "Lamellas". The EVs just have them at the bottom.
I see, thanks for explaining, no wonder I don't see them, so they were only on the luxury trim with the standing star?
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Old Feb 27, 2025 | 05:34 PM
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Originally Posted by W205C43PFL
I see, thanks for explaining, no wonder I don't see them, so they were only on the luxury trim with the standing star?
Correct. Might have been in cars through 2022 model year, but I haven't seen any in luxury trim in quite a wihle.
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