How many drainage holes does the sunroof of the BMW 3 Series have?
2 Answers
The sunroof of the BMW 3 Series has four drainage holes. Pay attention to the waterproofing of the sunroof: The sealing of the sunroof is done with rubber seals. During use, it is important to keep the seals free of dust, especially in winter or after long-distance travel. Regularly clean them with a duster. Additionally, never attempt to open the sunroof when it is frozen, as this can damage the sunroof motor. In seasons with heavy sand or dust, clean the seals with a sponge every two months. Operating the electric sunroof: Avoid fully opening the sunroof on bumpy roads, as excessive vibration between the sunroof and the sliding rails can cause deformation of related components or even damage the motor. During car washing: Avoid directing high-pressure water jets directly at the seals. This can not only deform the seals under pressure, leading to water leakage into the car, but also significantly damage the seals.
I used to drive a BMW 3 Series for quite some time and often researched these issues. Its sunroof design is quite clever, typically featuring four drainage holes: two at the front near the windshield and two at the rear near the rear window area. The main function of these holes is to collect rainwater or dew from the sunroof gutter and guide it through hoses to drain out under the car. One spring when there was a lot of rain, I noticed the car's carpet was wet. Upon inspection, I found that the rear holes were clogged with leaves, causing water to backflow inside. This made cleaning the carpet and drying it a real hassle. Since then, I've developed a habit of using compressed air to blow out the holes or gently cleaning them with a soft brush before the rainy season each month to prevent blockages that could lead to mold or electrical short circuits. Overall, the layout of the four holes ensures more even water flow and reduces risks, but regular maintenance is key to not letting it affect your driving comfort.
