There will be screams when the car starts. Where did this cry come from?

This cold car of Volkswagen Bora has a similar whistle when it is started, and this is the reason for these phenomena. He wants to find the reason from his design. The first reason is that many mechanics say that belts ring, the second reason is the sound of mechanical ventilators, and the third reason is the howling of throttle. I will talk about the causes and elimination methods of this howling from these places.

First, let's talk about the sound of a belt. This belt forms a transmission device between moving pairs, and its aging degree is beyond doubt. In addition, it is made of rubber, which will cause surface hardening and cracking when used for a long time. When the engine is cracked, aged and cold, it will produce howling. When this noise occurs, first clean the belt or apply belt oil to eliminate this noise. If it can't be solved, you can only replace the belt. Only by replacing the belt can the howling be reduced or eliminated.

Now it's the mechanical ventilator. His problem is that the mechanical ventilator accumulates too much carbon. When his blade rotates, the carbon deposit and the blade form a vacuum vortex, which will form a whistling sound. This sound will disappear when the blades are not working, or it will disappear when the temperature rises and the carbon deposits become soft. This situation can only be solved by cleaning. Only when the ventilator is removed and cleaned with cleaning agent can this ventilator be used.

Then there is the whistle of the accelerator, and his voice is also a kind of carbon deposit. As we all know, the throttle valve is in charge of air intake, and its opening affects the engine speed. When pollutants appear in the flap position of the throttle, the opening and closing of the throttle will form an obstacle. When pollutants form carbon deposits for a long time, the opening of the throttle valve will be affected, and the vacuum degree will change, so will his air intake. There will be a whistle at this time, that is, the sound of whistling. With the increase of temperature, the throttle opening is also changing. From large openings to small openings, this sound will also change or disappear. The solution to this situation is to clean the throttle. As long as the cleanliness of the throttle is guaranteed, there is no problem.

The solution of this whistle is this. As long as it is cleaned and maintained during the maintenance period and replaced in time, it is enough.