What is the automotive ventilation cover assembly?
The automotive ventilation cover assembly is a type of ventilation structural component located on the vehicle body. Its main function is to balance the air pressure inside and outside the vehicle, expel the air inside, and also take into account drainage, noise reduction and sealing.
In simple terms, it is like opening a "one-way breathing hole" on the vehicle body: the air inside can be expelled, but water and most of the noise are kept outside.
Main function
Balanced Air Pressure: When closing the car door, the air inside the vehicle is compressed, causing the pressure to suddenly increase. If the pressure cannot be released quickly, closing the door will be very difficult, and it may even cause vibrations to the ears. The ventilation cover assembly is designed to allow this airflow to be expelled from the rear of the vehicle, maintaining pressure balance.
Cooperation with Air Conditioning Ventilation: When using the external circulation mode of the air conditioning, fresh air from outside is drawn in, while the turbid air inside is expelled through this component, achieving ventilation.
Reduction of Wind Noise: When the vehicle is in motion, the outside air flow is fast and the pressure is low. The air inside will flow out through this passage, helping to reduce wind noise and fluctuations in the internal pressure.
Common Locations and Structures
Location: Generally installed at the rear of the vehicle, such as behind the tail lights or near the trunk.
Structure: Usually composed of several independent small blades. When the airflow passes through, the blades automatically open; there is also a rubber sealing ring on the back, which serves a waterproof and sealing function.
Confusing Points: The "ventilation cover plate" at the front of the vehicle
Here, it is necessary to clarify first: There is another part on the vehicle called a "ventilation cover plate", but its position and function are completely different. It refers to the plastic decorative panel under the wiper, at the bottom of the front windshield, also known as the rainwater collection plate or the front windshield lower decorative panel.
Its Function: It serves to provide dust protection for the wiper shaft, guide the rainwater out, prevent water from entering the engine compartment, and is also related to the air intake system of the air conditioning.
Great Wall Automobile applied for a patent for the "ventilation cover plate structure" in 2024. This structure is located under the hood and is sealed in alignment with the front windshield, taking into account both the appearance integrity and pedestrian protection safety performance.
So, if the "ventilation cover assembly" you are asking about is at the rear of the vehicle, it is responsible for balancing the air pressure and ventilation; if it refers to the panel under the wiper at the front of the vehicle, it is responsible for waterproofing, dust prevention, and deflection. Both are not simple covers like the air outlet.
The main function of the vehicle ventilation cover assembly is to balance the air pressure inside and outside the vehicle, expel the internal air, and also take into account drainage, dust prevention, and sound insulation. It is a key component for ensuring the safety of passengers and the normal operation of the air conditioning system.
Core Functions
Balancing Air Pressure: When closing the car door or using the external circulation mode of the air conditioning, the pressure inside the vehicle will suddenly increase. The ventilation cover assembly can promptly expel the excess air outside the vehicle to avoid window fogging and door locking problems.
Auxiliary Ventilation: When using the external circulation mode of the air conditioning, fresh air from outside is drawn in, and the turbid air inside is expelled through it, achieving a circulation update of the internal air.
Accelerating Heat Dissipation: When the vehicle is traveling at high speed, the airflow passes through it to remove the heat from the engine compartment and the interior, helping the engine maintain a stable working temperature.
Other Functions
Drainage and Dust Prevention: The drainage channels on the ventilation cover plate (also called the rainwater collection plate) can quickly drain water, preventing water from entering the engine compartment; at the same time, the sealing structure can prevent sand, stones, and dust.
Sound Reduction and Noise Suppression: During acceleration, the outside noise (exhaust sound, road noise) may be transmitted into the vehicle through the ventilation opening, so the component is usually equipped with sound insulation treatment.
If the ventilation cover plate is damaged or blocked, it may cause leakage, window fogging, or even damage to internal components of the engine compartment. It is recommended to check it every 20,000 kilometers, and test the drainage function before the rainy season.
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