Slightly turn the cap of the expansion tank to the left and release the pressure in the cooling system. Then unscrew the cover and remove it.
Attention: Do not open the cover when the engine is hot - it is dangerous! The cooling system is under pressure. Remove the cover only when the coolant temperature is less than 60C. Before unscrewing, cover the cover with a thick cloth.
Raise and support the car in front, remove the lower casing (mudguard) engine compartment.
Place a clean drain pan under the radiator and unscrew the drain plug at the bottom of the radiator. To turn the cork, you need to use a large screwdriver or even a coin.
Move the drain container under the engine and unscrew the drain plug on the cylinder block. The plug is under the exhaust manifold.
Let coolant drain completely.
Screw the drain plug with a new O-ring into the cylinder block and tighten to 40 Nm.
Loosely tighten the radiator drain plug with a large screwdriver or coin.