Mercedes-Benz S-Class Cabriolet 2017, Owner'S Manual

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Warning/indicator lamp
Possible causes/consequences and M M Solutions
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Coolant warning lamp
The red coolant warning lamp is lit while the engine is running.
Possible causes:
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The temperature sensor is malfunctioning
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Coolant level too low
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The air supply to the radiator is obstructed
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The radiator fan is faulty
If there is an additional warning tone, the coolant temperature has exceeded 120 °C.
& WARNING Danger of burns when opening the bonnet
If you open the engine bonnet 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.
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Before opening the bonnet, allow the engine to cool down.
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In the event of a fire in the engine compartment, keep the engine bonnet closed and call the fire service.
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Stop the vehicle immediately, paying attention to road and traffic conditions, and switch off the engine. Do not con‐
tinue driving under any circumstances.
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Observe the messages in the multifunction display.
If the coolant temperature display is at the lower end of the temperature scale:
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Consult a qualified specialist workshop.
478 Display messages and warning/indicator lamps