Loosen the bleed bolt at the top of the radiator next to the expansion tank and wait until the coolant bubbles no longer come out.
Loosen the air bleed screw (arrow) on the coolant pipe in the area of the oil filter until coolant no longer comes out with bubbles.
Tighten the air bleed screws and add coolant to the expansion tank.
Diesel engine: bleed automatically through the top tube to a separate expansion tank, it does not have bleed screws.
Close the expansion tank with a cap. The engine must not be warmed up with the cover open, because this may result in damage.
Start the engine, set the heater to the WARM position and warm up the engine. Maintain momentum with feed «gas» at 2500 rpm. Removing residual air from the system will cause the coolant level to drop to the level of the MAX mark on the reservoir.
Switch off the ignition.
Attention: Wait until the engine has cooled down, otherwise, when opening the cap of the expansion tank, you may get burned by hot steam or coolant.
Add coolant on a cold engine to the MAX mark on the expansion tank.
Loosen the bleed bolts again and make sure that the coolant comes out without air bubbles, then tighten the bolts.
Check the cooling system for tightness, especially hose connections, drain plugs and water pump.