If the engine is hot, you need to let it cool down and then release the excess pressure in the cooling system by unscrewing the expansion tank cap.
Place a wide container with a capacity of at least 7.5 liters under the drain hole located at the bottom of the left tank of the cooling system radiator.
To reduce the intensity of fluid drainage at the initial moment, the expansion tank cap should be tightly screwed on.
We unscrew the radiator drain plug by hand..
…and drain the coolant into a container by unscrewing the expansion tank cap.
Using a Phillips screwdriver, loosen the clamp securing the lower radiator hose.
We remove the hose from the radiator pipe..
…and drain the liquid from the engine into a container provided.
To improve fluid drainage from the engine…
...use pliers to squeeze the clamp securing the coolant supply hose to the throttle heating unit and slide the clamp along the hose.
We remove the hose from the throttle assembly branch pipe.
After draining the coolant, connect the hose to the radiator, tighten the clamp and screw on the radiator drain plug. Fill the system through the expansion tank until liquid flows from the coolant supply hose to the throttle heating unit. After that, install the hose in place and secure it with a clamp. Start the engine. With the engine running, vigorously squeeze the cooling system hoses several times in turn - this will help the liquid fill the system and displace air from it. As the liquid level in the expansion tank drops, bring it to normal and screw on the tank cap. When the engine warms up, the outlet (lower) radiator hose should be cold for some time, and then quickly heat up, which will indicate the beginning of the liquid circulation in a large circle. After waiting for the cooling system fan to turn on, stop the engine.
After the engine has cooled down, check the coolant level in the tank and top it up to normal (it should be between the MIN and MAX marks).