Noise when folding the rearview mirror is generally caused by insufficient lubrication of the torsion spring inside the mirror. You can remove the rearview mirror cover, spray lubricant on both ends of the spring, and then manually fold and unfold the mirror to see if the noise disappears. Repeat the process of spraying, folding, and unfolding multiple times until the noise is eliminated. Patterns of noise occurrence: One scenario is during hot summer weather when the sealing components expand due to heat, combined with insufficient lubrication. Another situation is after rain or car washing, as the vehicle may be dirty, and tiny debris washed by rain or water can adhere to the mirror base and sealing components. Solution: Manually extend and retract the rearview mirror, cleaning all visible rotating components connected to the mirror during extension and retraction. After wiping clean, apply WD-40 rust-preventive lubricant to the moving parts, spraying during both folding and unfolding. Gaps or misalignments between plastic and wiring components, especially after prolonged exposure to sunlight, can lead to such issues, causing abnormal noises due to loosening when the vehicle is on bumpy roads. Electrical current noises inside the car mostly occur right after starting, especially during a cold start, when audio systems, air conditioning, wipers, or other devices are activated immediately or automatically. These noises usually disappear once the engine warms up or the vehicle stabilizes during driving.
