2005 Mercedes C-Class Owner's Manual - Page 120

Controls in detail Instrument cluster Coolant temperature gauge Warning! The coolant temperature gauge is on the left side in the instrument cluster ( page 24). During severe operating conditions, e.g. stop-and-go traffic, the coolant temperature may rise close to 248°F (120°C). The engine should not be operated with the coolant temperature above 248°F (120°C). Doing so may cause serious engine damage which is not covered by the Mercedes-Benz Limited Warranty. G Driving when your engine is badly 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 and can occur just by opening the hood. Stay away from the engine if you see or hear steam coming from it. Turn off the engine, get out of the vehicle and do not stand near the vehicle until the engine has cooled down. 118