Mercedes-Benz A-Class 2020 Operator's Manual page 399

Warning/indicator lamp Possible causes/consequences and
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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
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If the coolant temperature display is at the lower end of the temperature scale:
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or
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The coolant level is too low
The air supply to the radiator is obstructed
The radiator fan is faulty
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
not continue driving under any circumstances.
Observe the messages on the multifunction display.
Consult a qualified specialist workshop.
Exit the vehicle and keep a safe distance from it until the engine has cooled down.
Check the coolant level ( page 261).
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Display messages and warning/indicator lamps 397
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