What runs alongside both sides of the window to maintain its upright position?

The run channel is a critical component in automotive design that helps to maintain the proper alignment and position of the window within the vehicle door. It runs along both sides of the window and facilitates smooth operation when the window is raised or lowered. The run channel also helps to reduce wind noise, prevent leaks, and protect the window from debris and damage.

By providing a defined pathway for the window to travel, the run channel ensures that the window remains securely in place, contributing to overall vehicle safety and functionality. The design of the run channel typically allows for easy movement while keeping the window stable, which is essential for both driver visibility and passenger comfort.