Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 583

Warning/indicator lamp
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Coolant warning lamp (yel-
low)
Possible causes/consequences and
Stop the vehicle immediately in accordance with the traffic conditions and switch off the engine. Do not continue
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driving.
Note the messages on the driver display.
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If the coolant temperature display is at the lower end of the temperature scale:
Consult a qualified specialist workshop.
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If the coolant temperature display is at the upper end of the temperature scale:
Exit the vehicle and keep a safe distance from it until the engine has cooled down.
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Make sure that the air supply to the radiator is not obstructed.
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Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. In doing so, ensure that the
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coolant temperature display remains below 120°C.
* The yellow coolant warning lamp is lit while the engine is running.
Possible causes:
The temperature sensor is malfunctioning
R
The charge air, transmission oil or battery cooling is faulty
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The radiator shutters are blocked or defective
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Avoiding high loads on the engine, drive to the nearest qualified specialist workshop.
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Solutions
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P223 0288 02
Display messages and warning/indicator lamps 581