What Causes the Noise When Wipers Scratch the Windshield?
2 Answers
Wipers scratching the windshield with noise can be caused by: 1. The wiper blades have aged and hardened; 2. There is a foreign object between the wiper blades and the windshield; 3. The linkage mechanism is deformed or there is an issue with the motor gap relay; 4. If the wipers move too fast, too slow, or continuously, it may be due to incorrect wiper arm angle. Wipers, also known as windshield wipers, are devices used to remove raindrops and dust from the vehicle's windshield, improving driver visibility and enhancing driving safety. The wiper system consists of a motor, reducer, four-bar linkage mechanism, wiper arm spindle, and wiper blade assembly.
I've encountered a similar situation before while driving—the squeaking noise from the wipers scraping against the windshield was quite annoying. The main cause is likely the wiper rubber hardening due to aging, preventing even contact with the glass and creating friction noise. If there are insect remains, dust, or an oily film on the glass surface, it can also cause the wipers to scrape unclearly and produce noise. Additionally, a loose or deformed wiper arm can make the entire assembly shake, intensifying the sound. Using the wipers without spraying water in dry weather can easily damage the rubber. I recommend first thoroughly wiping the windshield with glass cleaner to ensure no residue remains. Then, check if the wiper arm screws are loose and tighten them by hand if necessary. If the rubber is cracked or has been used for over a year, replace the wiper blades promptly—high-quality ones cost just a few dozen yuan and are easy to install yourself. Avoid using the wipers when it's not raining, especially in winter when the rubber is stiff—forcing them can shorten their lifespan. Safety comes first—poor visibility can lead to accidents, so addressing the issue promptly saves both hassle and money.
