This exterior component, found on the BMW 3-Series (E90 generation) models, refers to the decorative and protective molding located along the edge of the vehicle’s roof on the driver’s side. It typically consists of a long, narrow piece made from materials like plastic or rubber, designed to seal the gap between the roof panel and the body of the car. This sealing function helps prevent water leaks and wind noise while also enhancing the vehicle’s aerodynamic properties.
Properly functioning molding contributes significantly to the vehicles overall weather resistance and cabin comfort. Damaged or deteriorated molding can lead to water intrusion, causing potential damage to the interior headliner, electrical systems, and potentially promoting rust. Furthermore, it plays a role in minimizing wind noise at higher speeds, thus improving the driving experience. Over time, exposure to the elements can lead to wear and tear, making replacement necessary to maintain the vehicles structural integrity and aesthetic appeal. The specific design and material composition of this part evolved alongside the E90’s production run (2004-2012), sometimes incorporating minor changes for improved functionality or aesthetics.
