2008 Mercedes SL-Class Owner's Manual - Page 349
2008 Mercedes SL-Class Manual
Page 349 highlights
Practical hints What to do if ... Problem Possible cause/consequence The red coolant warning lamp comes on when the engine is running. There is insufficient coolant in the reservoir. Suggested solution Immediately add coolant to prevent engine from overheating ( page 288). Have the cooling system checked. If the coolant temperature is below 248°F (120°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 If this warning lamp comes on frequently, there is a leak in the cooling system. If the coolant level is correct, the electric radiator fan may be broken. D The red coolant warning lamp The coolant temperature has exceeded comes on when the engine is 248°F (120°C). running and you hear a warning sound. Stop in a safe location as soon as possible and allow the engine and coolant to cool down. 348