Mercedes-Benz S-Class 2019 Operator's Manual page 534

532 Display messages and warning/indicator lamps
Warning/indicator lamp
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Coolant warning lamp
Possible causes/consequences and
The red coolant warning lamp is lit while the engine is running.
Possible causes are:
The temperature sensor is malfunctioning
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The coolant level is too low
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The air supply to the radiator is obstructed
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The radiator fan is faulty
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If there is an additional warning tone, the coolant temperature has exceeded the maximum permissible temperature.
& WARNING Danger of burns when opening the hood
If you open the hood when the engine has overheated or during a fire in the engine compartment, you could come
into contact with hot gases or other escaping operating fluids.
Before opening the hood, allow the engine to cool down.
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In the event of a fire in the engine compartment, keep the hood closed and call the fire service.
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Pull over and stop the vehicle safely and switch off the engine, paying attention to road and traffic conditions. Do
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not continue driving under any circumstances.
Observe the messages on the multifunction 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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