1. Dry door hinges: Over time, the door hinges can become dry and lack lubrication, causing a grinding noise when they are opened and closed.
2. Worn door bushings: The door bushings, which are located on the hinge pins, can wear out over time, causing the door to shift slightly and rub against the door frame, creating a grinding noise.
3. Misaligned door: The door may be misaligned, causing it to rub against the weatherstripping or the door frame, resulting in a grinding noise.
4. Damaged door rollers: Some Suburban models have rollers on the bottom of the door that help it slide open and closed. If these rollers become damaged or worn, they can cause a grinding noise.
