Mercedes-Benz E-Class Sedan Operator's Manual page 441

Warning/indicator lamp
Possible causes/consequences and
Otherwise:
Leave the vehicle and keep a safe distance from the vehicle until the engine has cooled down.
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Check the coolant level .
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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 on to the nearest qualified specialist workshop. In doing so, ensure that the
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coolant temperature display remains below 248 °F (120 °C).
Display messages and warning/indicator lamps 439
M Solutions