Contents: Drain ↡ Refueling ↡
1. Engine cylinder block; 2. Cylinder head; 3. Liquid cooling system pump; 4. Coolant regulator (thermostat); 5. Upper coolant pipe; 6. Radiator with horizontal coolant flow; 7. Lower coolant line; 8. Oil radiator; 10. Expansion tank; 11. Silicate stock for preventing corrosion of aluminum alloys; 12. Drain tank; 13. Air removal line; 14. Refueling line; 15. Heat exchanger of the heating system; 16. Heating supply; 17. Heating outlet on the right; 18. Heating outlet on the left; A – coolant circulation mode in a small circuit. The coolant circulates only in the engine when its temperature is below 87°C; B – mixed mode. When the coolant temperature is within 87–102°C, the coolant regulator is partially open. The coolant also flows through the radiator; C – cooling mode. When the coolant temperature is above 102°C, its regulator is fully open. All the coolant flows through the radiator
As part of maintenance, the coolant should be replaced every 3 years. If the cylinder head gasket, radiator, heat exchanger or engine were replaced during a cylinder head overhaul, the coolant should be replaced in each case. This is necessary because anti-corrosion decomposition products are deposited on new light alloy parts during the running-in period and form a durable anti-corrosion layer. Used coolant usually does not contain enough of these anti-corrosion decomposition products to form the necessary protective layer on new parts.
If coolant is drained as part of other repairs, reuse it.
Warning! The coolant is poisonous and should not be simply poured out or mixed with household waste, but must be drained into special places.
1. Disconnect the battery ground (–) cable.
Attention! This will erase the radio's anti-theft code.
2. Turn the cap on the expansion tank to the left until it locks in place and the excess pressure is released from the cooling system. Then turn the cap further and remove it completely.
Caution! If the engine is hot, place a thick cloth around the cap before removing it to avoid burns from hot coolant or its vapors. Remove the cap only when the coolant temperature is below 90°C.
3. Remove the lower engine compartment cover.
4. Attach a hose with an internal diameter of 12 mm to the radiator drain nipple (arrow).
5. Place a clean collecting vessel under the radiator. Insert the hose into the collecting vessel and open the drain plug (3).
Drain
[Article borrowed from the web portal: MercedesMAN.ru]
1. Attach a hose with an internal diameter of 12 mm to the drain plug (4) on the engine cylinder block.
2. Place a clean collecting vessel under the engine, insert the hose into it and only loosen the drain plug without unscrewing it completely.
3. Drain the coolant completely.
4. Tighten the drain plug on the engine block to 30 Nm.
5. Screw in the radiator drain plug with a torque of 1.5 to 2 Nm (by hand).
6. If fitted, remove the drain hose.
7. Install the lower engine compartment cover.
Refueling
1. Check the antifreeze content in the coolant.
2. Fill the coolant up to the mark (arrow) through the filler pipe of the expansion tank (2). For cars without a separate expansion tank - up to the mark in the filler pipe, in the case of a black upper part of the tank - up to the beginning of the black part.
3. Connect the ground wire to the battery.
4. Let the engine warm up at idle speed until the coolant thermostat opens (coolant temperature is about 100°C). At the same time, set the heating to full power and press the accelerator pedal jerkily.
Caution! When the coolant temperature is between 60 and 70°C, close the expansion tank.
5. Check the tightness of the cooling system hose connections, as well as the threaded drain plugs and the liquid cooling system pump.
6. Set the time on the clock.
7. Enter the radio anti-theft code.