What is the reason why the sunroof of the new BMW 3 Series cannot be fully opened?
2 Answers
The new BMW 3 Series sunroof not fully opening is one of the modes of the dual-mode panoramic sunroof. This mode is generally used for ventilation inside the car. According to the tilted angle at the rear, negative pressure is created while the car is moving, which can quickly expel rising air currents and smoke generated inside the car, serving the function of external circulation. The advantage is that it can also be used on rainy days. The panoramic sunroof has two opening methods: One is where the rear of the panoramic sunroof tilts up to create a gap, suitable for driving, allowing the negative pressure to extract air from inside the car. The other is where the entire panoramic sunroof slides backward to open completely, suitable for parking to enjoy the scenery or for low-speed driving. The sunroof is sealed with a rubber seal. During use, it is important to pay attention to dust prevention for the seal. In winter or after long-distance travel, frequently clean it with a duster. Do not force the sunroof open when it is frozen, as this can damage the sunroof motor. In seasons with high wind and sand, clean the seal with a sponge every two months.
I've driven the new BMW 3 Series, and it's quite common for the sunroof not to open fully. This is mainly a deliberate design limitation. BMW engineers considered driving safety, as fully opening it at high speeds might allow debris to be sucked in or create excessive wind noise that could affect driving. It's not a malfunction but rather a protective measure. The new 3 Series also features an anti-pinch sensor system, which sometimes stops automatically when encountering foreign objects to avoid injuring passengers. Many modern cars are like this—just opening halfway for ventilation is sufficient. During maintenance, make sure to check the cleanliness of the tracks to prevent dust from clogging and affecting the sliding mechanism.
