E9 Coupe Rust Diagrams

Front and Rear Windows:

The front and rear window frames are one of those areas that can have rust problems without any visible signs from the outside. The car pictured below looked fairly nice up until the rear window actually fell out! The entire rear sheet metal section of this frame had to be replaced with a solid used piece.

Most of the water and moisture that causes the problem in this area comes from above. Dirt is probably the worse enemy, getting caught between the frame and rubber seal and holding moisture. It can also be hard to check this area for rust since the rubber gaskets tend to get less plyable with age and can't be lifted up without cracking.

Although always a concern with coupes, these areas are usually not as problematic as others.