Contents: Draining the coolant ↡ Flushing the cooling system ↡ Radiator flushing ↡ Engine flush ↡ Filling the cooling system ↡ Antifreeze ↡
Draining the coolant
Caution! Replace the coolant on a cold engine. Avoid contact of coolant with painted surfaces of the body and clothing. Otherwise, wash the area where the coolant has come into contact with plenty of water.
Removal the cap from the expansion tank
Location of coolant drain plug
Location of the coolant drain plug on the engine block
1. Remove the cap from the expansion tank (see Fig. Removing the expansion tank cap).
2. Place a suitable container under the radiator and place a rubber hose on the drain end (see Fig. Location of drain tip for draining coolant). Using a large screwdriver, open the drain plug located under the tip and drain the coolant through the hose into a container.
3. Place a suitable container under the engine block drain plug, which is located on the right front side of the cylinder block (see Fig. Location of the coolant drain plug from the engine cylinder block). Open the drain plug by turning it with a wrench and drain the coolant from the engine block.
4. After draining the coolant, remove the drain hose and close the plugs on the radiator and cylinder block.
Flushing the cooling system
The coolant must be changed periodically and the cooling system flushed, as rust and dirt form in the system channels.
The radiator must be flushed independently of the engine.
Radiator flushing
1. Disconnect the hoses from the radiator.
2. Insert the hose into the inlet of the upper radiator tank, turn on the water and flush the radiator until clean water appears from the lower radiator tank.
3. If you cannot flush the radiator with clean water, use a detergent.
Engine flush
1. Remove the thermostat and temporarily install the thermostat cover.
2. Disconnect the hoses from the radiator and feed a stream of clean water through the hose into the engine block through the upper radiator hose and flush it until clean water appears from the lower hose leading to the radiator.
Article borrowed from the web portal [www.mercedesman.ru]
3. Install the thermostat and connect the cooling system hoses.
Filling the cooling system
Filling the expansion tank with water
If the coolant was replaced, first pour 2 liters of water into the expansion tank.
Filling with antifreeze concentrate
Next, pour in the required amount of antifreeze concentrate and clean water until the level reaches the max mark on the expansion tank
1. Before filling the cooling system, check that all hoses and clamps are in good condition. Note that the antifreeze mixture should be used year-round to prevent corrosion.
2. Remove the cap from the expansion tank.
3. Slowly add coolant until the level reaches the max mark on the expansion tank.
4. If the coolant was replaced, first pour 2 liters of clean water into the expansion tank, then pour in the required amount of antifreeze concentrate and the remaining water (see fig. Filling water into the expansion tank, Filling antifreeze concentrate).
5. To remove air from the cooling system, squeeze the upper and lower radiator hoses. After removing the air, add coolant to the max mark on the expansion tank and install the plug.
6. On 6-cylinder SOHC engines, remove the plug from the coolant sensor housing on top of the cylinder head. Once coolant appears from the hole, reinstall the plug.
7. Start the engine and warm it up to operating temperature.
8. Stop the engine and let it cool, then check the coolant level.
Antifreeze
Antifreeze is a mixture of distilled water and ethylene glycol concentrate. Antifreeze provides protection for the cooling system from corrosion and increases the boiling point of the coolant. The amount of ethylene glycol in antifreeze depends on the weather conditions of the car and ranges from 40 to 70%.