If the engine is hot, let it cool down and then relieve excess pressure in the cooling system by unscrewing the expansion tank cap (see Checking the level and topping up the coolant).
The design of the cooling system allows you to drain the coolant through the drain fitting located in the lower radiator tank.
The drain fitting of the cooling system is directed downwards and enters the hole in the lower cross member of the radiator frame.
For ease of draining the coolant..
... we put a tube of suitable diameter on the drain fitting of the cooling system.
We substitute a wide container with a volume of at least 8.0 liters under the drain hole, or tube.
With a screwdriver, unscrew the drain plug...... and drain the liquid from the engine into a substituted container.
To improve the drainage of fluid from the engine, unscrew the cap of the expansion tank.
We wrap the drain plug.
Fill the system with coolant through the expansion tank. Let's start the engine.
With the engine running, we vigorously squeeze the cooling system hoses several times alternately - this will help the fluid fill the system and force air out of it. As the liquid level in the expansion tank drops, we bring it to normal and wrap the tank cap. When the engine warms up, the outlet (lower) the radiator hose should be cold for some time, and then heat up quickly, which will indicate the beginning of the circulation of fluid in a large circle. After waiting for the cooling fan to turn on, we stop the engine.
After the engine has cooled down, check the coolant level in the reservoir and top it up (it must be between the MIN and MAX marks).