Mercedes-Benz A-Class Operator's Manual page 486

484 Display messages and warning/indicator lamps
Warning/indicator lamp Possible causes/consequences and
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The red coolant warning lamp is lit while the engine is running.
Possible causes are:
R
Coolant warning lamp
R
R
R
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.
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If the coolant temperature display is at the lower end of the temperature scale:
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The temperature sensor is malfunctioning
The coolant level is too low
The air supply to the radiator is obstructed
The radiator fan is defective
Before opening the hood, allow the engine to cool down.
In the event of a fire in the engine compartment, keep the hood closed and call the fire service.
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.
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