2003 Mercedes E-Class Owner's Manual - Page 292

Practical hints What to do if ... Problem Possible cause The red coolant warning lamp There is insufficient coolant in the reservoir. lights up when the engine is running. If this warning lamp lights up frequently, there is a leak in the cooling system. If the coolant level is correct, the electric radiator fan may be broken. Suggested solution Immediately add coolant to prevent engine from overheating ( page 264). Have the cooling system checked. If the coolant temperature is below 257°F (125°C), you can continue driving to the nearest authorized Mercedes-Benz Center. Avoid high engine loads (e.g. driving uphill) and stop-and-go driving. D D The red coolant warning lamp lights up while driving and you hear a warning sound. The coolant temperature has exceeded 257°F (125°C). Stop as soon as possible and allow the engine and coolant to cool down. Warning! G catch fire. You could be seriously burned. Steam from an overheated engine can cause serious burns and can occur just by opening the engine hood. Stay away from the engine if you see or hear steam coming from it. Driving when your engine is badly overheated can cause some fluids which may have leaked into the engine compartment to Turn off the engine, get out of the vehicle and do not stand near the vehicle until it cools down. 292