2011 Mercedes E-Class Owner's Manual - Page 248
2011 Mercedes E-Class Manual
Page 248 highlights
246 Warning and indicator lamps in the instrument cluster Problem ? The red coolant warning lamp lights up while the engine is running and the coolant temperature gauge is at the start of the scale. Possible causes/consequences and M Solutions The temperature sensor for the coolant temperature gauge is faulty. The coolant temperature is no longer being monitored. There is a risk of engine damage if the coolant temperature is too high. X 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. X Engage the parking brake. X Consult a qualified specialist workshop. The coolant level is too low. If the coolant level is correct, the airflow to the radiator may be blocked or the electric radiator fan may be malfunctioning. The coolant is too hot and the engine is no longer being cooled sufficiently. X Pull over and stop the vehicle safely and switch off the engine, paying attention to road and traffic conditions. X Allow the engine and coolant to cool. X Check the coolant level and add the coolant (Y page 274). Observe the warning notes. X If the coolant needs adding more often than usual, have the engine coolant system checked. X Make sure that the air supply to the radiator is not blocked, e.g. by snow, slush or ice. X At coolant temperatures below 248 ‡ (120 †), continue driving to the next qualified specialist workshop. X Avoid subjecting the engine to heavy loads, e.g. driving in mountainous terrain, and stop-start driving. The coolant has exceeded a temperature of 248 ‡ (120 †). The airflow to the radiator may be blocked or the coolant level may be too low. The engine is not being cooled sufficiently and may be damaged. X Pull over and stop the vehicle safely and switch off the engine, paying attention to road and traffic conditions. X Allow the engine and coolant to cool. On-board computer and displays ? The red coolant warning lamp comes on while the engine is running. ? The red coolant warning lamp comes on while the engine is running. A warning tone also sounds. G Warning Driving when your engine is overheated can cause some fluids which may have leaked into the engine compartment to catch fire. You could be seriously burned. Steam from an overheated engine can cause serious burns which can occur just by opening the engine hood. Stay away from the engine if you see or hear steam coming from it.