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Discussion Starter · #1 ·
I came down a slightly inclined exit side road coming off a dual carriageway and briefly saw an amber warning message on the driver's display saying "top up coolant". This is for the heat pump.
It happened the next day whilst the car was on the driveway first thing in the morning. I stopped and started the car several times and it stayed on display. I went to the garage to show them, but by the time I arrived there, it had disappeared. They put it on their diagnostic machine, but nothing showed. They took the cap off the coolant tank and released the pressure. The coolant tank level was correct, so they did nothing else. It has not happened since.
This was 10 days ago but haHas anyone else seen this message on their vehicle?
 

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They need to bleed the entire coolant. I had mine 2 days ago at Hertford Merc and they mentioned that they received a lot of EQB and EQC with an airlock in the coolant tank causing some gushing sounds as well as popping up the amber warning to top up coolant.
They bled the system and refilled the coolant. Apparently, there was no need to topup the coolant, because the quantity was right, but the airlock was throwing the sensor off.
Hope this helps
 

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Discussion Starter · #3 ·
Thanks for responding. As described the pressure was released and with normal circulation and having a header tank there would not be any need to do anything further as the coolant level remained the same. They are a large dealership in Oxfordshire.
 

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I came down a slightly inclined exit side road coming off a dual carriageway and briefly saw an amber warning message on the driver's display saying "top up coolant". This is for the heat pump.
It happened the next day whilst the car was on the driveway first thing in the morning. I stopped and started the car several times and it stayed on display. I went to the garage to show them, but by the time I arrived there, it had disappeared. They put it on their diagnostic machine, but nothing showed. They took the cap off the coolant tank and released the pressure. The coolant tank level was correct, so they did nothing else. It has not happened since.
This was 10 days ago but haHas anyone else seen this message on their vehicle?
I have just taken ownership of an EQA & get the message to top up the coolant intermittently. I can only get a slot at the local dealership next Monday!! I thought coolant only related to petrol or Diesel engines?
 

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Our first EQC back in Aug had the top up coolant message appear on the dashboard just 2 weeks of ownership. I’d taken it to our local Mercedes’ dealership and at first they said the same thing you all mentioned about releasing the pressure, anyways that was corrected and within a couple more weeks we had the top up coolant message again. This time Mercedes’ diagnosed the problem relating to a faulty valve. This valve is on a back order and eta is 2 months for the fix. So Mercedes’ decided to replace our car with another new EQC. Taken possession yesterday and guess what! TOP UP COOLANT message on this one too…….
 

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As I understand Mercedes has at least three different problems wrt coolant that they have needed to solve on the EQA,EQB and EQC; The first was a problem with some batches of coolant that turned into gel and jammed the system, the second was air in the system as mentioned in this thread, and the third is a huge recall in china where they replace seals close to the rear motor. There have been lots of reports of leaks in china, some leaked into the motor, and motor failure... I see also in the forums in Norway that EQ cars leak coolant, so guess this is a systematic problem.
 
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