On a Volkswagen Passat, the phrase “sunroof replacement” can refer to two very different repairs, and picking the right scope is the easiest way to keep costs under control. A glass-only sunroof (moonroof) glass replacement is typically the correct fix when the panel is cracked, chipped, or shattered, but the mechanism still operates normally. If the roof slides and tilts smoothly, the seal sits evenly, and the frame is not distorted, the repair usually involves removing the damaged panel, preparing the bonding surface, installing the correct glass for your Volkswagen Passat, and setting height and alignment so the panel closes flush. Leak and wind-noise checks are part of doing it right. A full sunroof assembly replacement—often called the cassette or module—is more likely when breakage affected the moving hardware or the assembly was already failing. Common warning signs include a roof that will not open or close, grinding or binding in the tracks, broken lift arms or guides, a warped or corroded frame, damaged rails, or persistent leaks even after drains are cleared. Panoramic systems are especially sensitive to deformation; if the cassette is bent or the rails and seals are worn, replacing only the glass may not solve the underlying issue. Bang AutoGlass focuses on targeted diagnosis, not generic “replace everything” quotes. Because we’re mobile, we can inspect your Volkswagen Passat where it sits, confirm glass-only vs assembly needs, and build an estimate around the actual failure. When glass-only is appropriate, most installs take 30–45 minutes, plus at least one hour of safe drive-away time for adhesive cure.