It may be required to flush the radiator in the presence of the following signs: overheating, which is reflected by the car indicators, steam coming from under the hood, reduced traction and extraneous sounds in the engine. To flush the radiator, drain the refrigerant, pour special flushing liquids or distilled water, and start the engine at idle speed for a while. After that, drain the liquid, flush the cooling circuit with water, pour the minimum amount of refrigerant, start the power unit again. After that, pour the desired amount of antifreeze and clean the outer surface of the radiator.