Where are the sunroof drainage holes located on the BMW 3 Series?
2 Answers
The BMW 3 Series has four sunroof drainage holes, all located in the pillars next to the front and rear windshields. Here are some important notes: Pay attention to the waterproofing of the sunroof: The sunroof is sealed with rubber gaskets, so it's important to keep the gaskets free of dust during use. Do not force the sunroof open when it is frozen, as this may damage the sunroof motor. Avoid fully opening the sunroof on bumpy roads: It's best not to fully open the sunroof on rough roads, as excessive vibration between the sunroof and the sliding rails can cause deformation of related components or even damage the motor.
I drove a BMW 3 Series for several years. The sunroof drainage holes are usually hidden in the four corners of the roof. Look carefully near the A-pillars and C-pillars, and you'll find small holes designed to divert rainwater and prevent leaks into the car. Typically, the front two holes are located near the windshield connection, while the rear two are above the inner side of the taillights. You can see the gaps in the tracks when you open the sunroof. I clean them once a year to prevent leaves or dust from clogging them, as rainwater could otherwise leak onto the seats or carpets, causing mold or rust. Once, during heavy rain, I didn't clean them in time, and water dripped onto the audio system, which was a hassle to repair. So, I now make a habit of using compressed air to gently blow through the holes to ensure they're clear. Different model years may have slight adjustments, but the locations are generally stable. Regular checks can save a lot on repair costs.
