2009 Mercedes E-Class Owner's Manual - Page 247

Operation Engine compartment Transmission fluid level The transmission fluid level does not need to be checked. If you notice transmission fluid loss or gearshifting malfunctions, have an authorized Mercedes-Benz Center check the transmission. reservoir contains hot fluid and is under pressure. RUsing X a rag, slowly open the cap approximately 1/2 turn to relieve excess pressure. If opened immediately, scalding hot fluid and steam will be blown out under pressure. not spill antifreeze on hot engine parts. Antifreeze contains ethylene glycol which may burn if it comes into contact with hot engine parts. Using a rag, turn cap 2 slowly approximately 1/2 turn counterclockwise to release any excess pressure. X Continue turning cap 2 counterclockwise and remove it. The coolant level is correct if the level Rfor Coolant level The engine coolant is a mixture of water and anticorrosion/antifreeze. When checking the coolant level, the vehicle must be parked on level ground, and the coolant temperature must be below 158‡ (70†). RDo cold coolant: reaches marking bar 1 in coolant expansion tank 3 (1.5 cm) higher Rfor warm coolant: is approximately 0.6 in X X G Warning! In order to avoid any potentially serious burns: RUse extreme caution when opening the hood if there are any signs of steam or coolant leaking from the cooling system, or if the coolant temperature indicator indicates that the coolant is overheated. RDo not remove pressure cap on coolant reservoir if coolant temperature is above 158‡ (70†). Allow engine to cool down before removing cap. The coolant Add coolant as required. Replace and tighten cap 2. For more information on coolant, see the "Technical data" section (Y page 396) and (Y page 400). 1 Marking bar in the expansion tank 2 Cap 3 Coolant expansion tank Z 245