Open the valve of the body interior heater by setting the switch handle to the position «warm» («warm air») and unscrew the plug of the expansion tank.
Place a container under the engine to drain the fluid, disconnect the outlet hose from the radiator and unscrew the drain plug with a hexagonal head located at the rear of the cylinder block on the right with a 19 mm wrench and drain the fluid.
Pour coolant into the expansion tank.
Start the engine and let it run at fast idle. Loosen the purge screw located next to the diagnostic block.
Add liquid to the expansion tank until it flows out without bubbles, then tighten the bleed screw.
Wait approximately 1 minute and stop the engine.
Start the engine again and let it run for about 30 seconds at 4000 rpm.
When the engines are idling, check whether warm air enters the passenger compartment.
After the engine has cooled, add enough liquid to the expansion tank so that its level is no more than 2 cm below the tank cap.