Why can the sunroof of BMW X3 only open a small gap?

[MirandaLynn]

The reasons why the BMW X3 sunroof can only open a small gap are as follows: 1. This is one of the two opening modes of the dual-mode sunroof, typically used for vehicle ventilation. By tilting the rear section upward, it creates negative pressure during driving, which quickly exhausts rising hot air and smoke from the cabin, serving as an external circulation function. The advantage is that it can also be used during rainy days. 2. Most sunroofs have two opening methods: one is the rear section tilting upward to create a small gap, suitable for high-speed driving as it uses negative pressure to extract cabin air. The other is the entire sunroof sliding backward to fully open, suitable for parking to enjoy scenery or low-speed driving.