What is the car rear door sealing plug?
The sealing plugs (also known as rubber plugs or gaskets) on the rear doors of a car come in two main types, with different positions and functions:
The rubber plug on the edge or frame of the door (sealing buffer rubber block): This is the most common "sealing plug", mainly used for sealing, buffering, and shock absorption. When closing the door, it can absorb the impact force, preventing the metal of the door from directly colliding and deforming, and also preventing wind, dust, water, and noise.
The drainage hole rubber plug (waterproof plug) on the bottom of the door: At the lowest edge of the door, it is the plug on the drainage hole. This must not be removed! It is responsible for draining the rainwater inside the door and preventing dust and sand from entering. Removing it can easily cause sand to block the drainage hole, resulting in water accumulation inside the door, rusting, and possible interference with the window lifting mechanism.
Daily precautions
Don't pry it off randomly: Regardless of the type of rubber plug, it is not recommended to remove it actively. Especially the plug on the drainage hole, do not remove it! If removed, it may get wet, dusty, rusted, and increase the noise when closing the door.
Regular inspection: When washing the car, wipe the surface of the rubber plug with a damp cloth to check if there is any cracking, deformation or detachment. If you find aging and cracking, replace it in time.
The rubber film/gasket on the inner side of the car door: Some car door interior panels also have a layer of rubber film and gasket, mainly for sealing and sound insulation. If removed, it will cause the closing sound to become brittle, the noise to increase, and may also affect the window lifting mechanism.
The rear door sealing plug is mainly used for waterproofing, dustproofing, sound insulation, and shock absorption, and protecting the internal structure of the car door. Don't underestimate this small rubber block.
Specifically, it has the following functions:
Sealing protection: Block the process holes on the car door to prevent rain, dust, and sand from seeping into the interior of the car door, avoiding rusting of metal parts, short-circuiting of circuits due to moisture, and reducing the transmission of external noise into the car.
Buffer and shock absorption: Use the rubber elasticity to absorb the impact force when closing the door, avoiding direct hard contact between the metal of the door and the door frame, reducing the noise of the closing mechanism, and reducing the wear of hinges and locks, preventing the door from deforming and developing gaps over time.
Protecting internal components: Keep the interior of the car door dry, allowing the window lifting mechanism, door locks, wiring harnesses, and other key components to remain in a stable environment for a long time and reduce the likelihood of failure.
During daily use, if you find that the sealing plug is cracked, deformed, or detached, it is recommended to replace it in time. You can also wipe the surface of the sealing plug with a damp cloth when washing the car. Don't let it be worn down by sand. Be careful not to remove it out of curiosity, otherwise the sealing performance of the door will decrease, and it may cause abnormal noise when closing or water leakage problems.
The rear door sealing plug mainly blocks the process holes on the vehicle body, serving the functions of sealing, waterproofing, dustproofing, and noise reduction. It is generally not "malfunctioning". The problems you encounter such as poor sealing, water leakage, or increased noise are mostly due to the detachment, aging, and deformation of the sealing plug, or problems with the sealing rubber strip it cooperates with.
Common fault manifestations
Difficulty closing or poor sealing: First, check if the sealing plug has been pushed out or shifted. Also, check if the sealing strip on the door frame is aging and swollen, causing the door body and the car frame to not fit tightly.
Water leakage, dust entry, and increased wind noise: When the sealing plug is detached or the sealing strip is damaged, water and dust can easily enter the interior through the gaps, and the wind noise will increase at high speeds.
There is a "metal-on-metal" abnormal noise when closing: If the sealing plug is missing, the metal will directly collide when closing the door, and over time, the door is likely to deform and develop gaps.
Self-examination methods
First, visually inspect: Open the rear door and look along the door frame and the vehicle body for the black rubber plugs. Check if any have fallen off,ed up， or are significantly aged and cracked.
Clean and reset： Use a damp cloth to clean the sealing plug and the contact surfaces around it. If it is only shifted， gently push it back to its original position； also， clean the dust on the sealing strip on the door frame.
Check the condition of the sealing strip： If the sealing strip has local wrinkling or bulging， it can be slowly returned to its position； if there is a large crack or fracture， it is recommended to replace it directly.
Don't scribble on anything: Do not apply engine oil, alcohol or strong solvents on rubber parts. This will accelerate the aging of the rubber. Using a dedicated rubber maintenance agent is safer.
Points to note
If the sealing plug is severely damaged, lost, or the sealing strip has aged and deformed and cannot be restored, it is recommended to replace it with the original part directly. Do not try to patch it together with glue.
Loose door hinges and shifted lock positions can also cause the door to not close properly. In such cases, it is easier to get more off-track when adjusting by yourself. It is best to have it precisely corrected at a repair shop.
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