What Causes the Dry Grinding Sound When Folding the Rearview Mirror?
1 Answers
Rearview mirror folding noise is generally caused by insufficient lubrication of the internal torsion spring in the rearview mirror. You can disassemble the rearview mirror cover, spray lubricant on both ends of the spring, then manually fold and unfold the rearview 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 is during hot summer days when the sealing components expand due to heat and lack of lubrication; another is after rain or car washing, as the vehicle gets dirty, and tiny debris washed by rain or car washing adheres to the rearview mirror base and sealing components. Solutions: Manually extend and retract the rearview mirror, cleaning all visible rotating components connected to the rearview mirror during extension and retraction. After wiping clean, apply WD-40 rust-preventive lubricant to the rotating parts, spraying during both folding and unfolding. Plastic and wiring components may have gaps, misalignment, or movement, especially after exposure to sunlight, which can easily lead to such situations, causing the vehicle to produce abnormal noises on bumpy roads due to squeezing and loosening. The sound of electric current in the car mostly occurs when the vehicle is just started, especially during cold starts, when audio, air conditioning, wipers, and other devices are immediately or automatically turned on. The noise will automatically disappear after the engine warms up or the vehicle runs stably.
