2011 Mercedes R-Class Owner's Manual - Page 283

Engine compartment Further information on engine oil (Y page 354). X Replace cap : on the filler neck and tighten clockwise. Ensure that the cap locks into place securely. may burn if it comes into contact with hot engine parts. 281 Checking and adding other service products Only check the coolant level when the vehicle is on a level surface and the engine has cooled down. X Turn the SmartKey to position 2(Y page 149) in the ignition lock. On vehicles with KEYLESS-GO, press the Start/Stop button twice (Y page 149). X Check the coolant temperature gauge in the multifunction display. The coolant temperature must be below 158 ‡ (70 †). X G Warning Ruse In order to avoid any potentially serious burns: 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 display indicates that the coolant is overheated. Rdo not remove the pressure cap on the coolant reservoir if the coolant temperature is above 158 ‡ (70 †). Allow the engine to cool down before removing the cap. The coolant reservoir contains hot fluid and is under pressure. Rusing a rag, slowly turn the cap approximately 1/2 turn to relieve excess pressure. If opened immediately, scalding hot fluid and steam will be blown out under pressure. Rdo not spill antifreeze on hot engine parts. Antifreeze contains ethylene glycol which Slowly turn cap : half a turn counterclockwise and allow excess pressure to escape. X Turn cap : further counter-clockwise and remove it. If the coolant is at the level of marker bar = in the filler neck when cold, there is enough coolant in coolant expansion tank ;. If the coolant is approximately 0.6 in (1.5 cm) higher when warm, there is enough coolant in coolant expansion tank ;. X If necessary, add coolant which has been tested and approved by Mercedes-Benz. X Replace cap : and turn it clockwise as far as it will go. For further information on coolant, see (Y page 355). Windshield washer system/headlamp cleaning system The washer fluid reservoir is used for both the windshield washer system and the headlamp cleaning system. G Warning Washer solvent/antifreeze is highly flammable. Do not spill washer solvent/ antifreeze on hot engine parts, because it may ignite and burn. You could be seriously burned. Z Maintenance and care Checking the coolant level