Abnormal sound when the cooling engine accelerates.

1, the engine will whir when accelerating, or it will appear when decelerating. In short, the sound will change with the change of speed. Possible cause: the power steering oil is insufficient and filled with oil. The generator bearing may be damaged. Power steering pump, water pump problems, will produce similar noise 2, the engine has the sound of kicking people, like the sound of a pencil knocking on the table, the engine speed increases and the sound increases. Possible cause: There is dust in the engine. It is recommended to change the oil, filter the engine and clean the engine. There may be a valve problem.