Why does my Mercedes EQE say cooling system malfunction or check coolant level?

Short answer: 'Cooling system malfunction' on an EQE has often been a faulty valve or flap in the cooling system, which owners said dealers replaced in a few days. A 'check coolant level' warning was often fixed with a top-off. Don't put it off: the coolant keeps the battery and motors at a safe temperature, and some cars went into reduced power after fast charging.

Symptom: A yellow or red cooling system malfunction or check coolant level message, sometimes with weak A/C or reduced power, especially after DC fast charging.

What to check first

1. Note whether the message is yellow or red, and follow the manual.
2. Note whether it happens after fast charging or in heat.
3. Book the dealer and ask them to check the cooling valves.
4. Don't add your own coolant without the correct Mercedes spec.
5. Run your VIN at nhtsa.gov/recalls.

Likely causes

1. Faulty cooling system valve or flap. EVs use liquid coolant to keep the battery and motors at the right temperature. Several owners said dealers fixed the malfunction warning by replacing a valve or flap in the cooling system.
2. Coolant level a little low. Owners with low coolant warnings said dealers often just topped it off, and one dealer said they don't always come completely full from the factory.
3. Software. Some owners waited for software updates as part of the fix.

What it usually costs

Owners reported warranty repairs or top-offs and didn't post prices.

Is it safe to keep driving?

If the warning is red or power is reduced, stop and call the dealer. For a yellow warning, get it checked soon and avoid fast charging until then.

DIY or shop?

Nothing to DIY. Coolant in EVs must be the exact spec. An EV's high-voltage system can stay live with the car off. Leave the orange cables, the big battery and the charging hardware to a trained EV technician.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA's recall lookup returned no EQE recall listings for 2023-2025 under the model names we searched. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 4 keyword-matched complaints for Mercedes-Benz EQE 2023–2025 (of 62 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-01; keywords: coolant, cooling, valve, pump, overheat, temperature, reduced power, turtle) (NHTSA returned no data for 4 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Cooling system malfunction anyone have similar issues on Reddit r/MercedesEQ, owners compared cooling system malfunction warnings. One said their EQB had the same message and a valve was replaced, one EQE owner had a recurring issue and got a buyback, and another said the A/C stopped blowing cold while DC fast charging, then the car went into reduced power until the battery cooled down.
• In Update on the cooling system error of EQE 500 2024 on Reddit r/MercedesEQ, a 2024 EQE 500 owner with a cooling system error wondered if it explained higher energy use in the cold. Other owners said their dealers replaced a valve or flap in the cooling system and the warning went away, with the car in the shop about three days, and advised not to delay it.
• In Low Coolant ? 2023 EQE 350+ on Reddit r/MercedesEQ, a 2023 EQE 350+ owner got a low coolant warning. Other owners said their dealers topped it off, one said a dealer claimed they don't come completely full from the factory, and others said to have it checked since coolant protects the battery and motors.

Quick tip

Don't wait for the warning to turn red. The repairs owners describe were quick.

Vehicle focus: Mercedes-Benz EQE sedan and EQE SUV (350, 500, AMG), 2023-2025.

Safety / mechanic note

Overheating can damage the high-voltage battery. Verify with a mechanic.