Why is there always a sound of wipers rubbing against dry glass?
2 Answers
Wipers rubbing against the glass may produce noise due to aging and hardening of the wiper blades, foreign objects between the wiper blades and the windshield, deformation of the linkage mechanism, or issues with the motor or interval relay. Below are the causes and solutions for these problems: 1. Wiper blade issues: Wiper blades are rubber products and will age and harden over time, especially in winter. If they no longer clean effectively, the simplest and most effective solution is to replace them. Generally, wiper blades should be replaced every one to two years. 2. Foreign objects between the wiper blades and windshield: When the wipers are turned on, sharp noises may occur due to friction between the blades and the windshield. Owners should check and clean any debris under or around the wiper blades to ensure cleanliness. 3. Deformation of the linkage mechanism or issues with the motor or interval relay: Abnormal noises can result from the wipers moving too fast, too slow, or continuously. Over time, the mechanism may deform, become stuck, or rust, leading to abnormal operation. If new wiper blades have been installed, check for dirt or oil stains on the windshield and clean it with a cleaning solution or try another set of new blades. If the noise persists, adjust the angle of the wiper arm using pliers. 4. Incorrect wiper arm angle: In most cases, the squeaking noise occurs because the wiper arm angle is incorrect, causing the blades to bounce on the windshield. If the blades are in good condition, adjust the angle of the wiper arm so that the blades are perpendicular to the windshield. You can use pliers to adjust the angle—place a cloth over the wiper arm head, grip it with pliers, and bend it slightly to ensure the blades are perpendicular to the windshield.
I've encountered that annoying squeaking sound of wipers scraping on dry glass a few times, usually caused by hardened wiper blades. The rubber on wipers becomes stiff and loses elasticity due to sun and rain exposure, making it screech like hard plastic when moving across dry glass. It could also be due to oil film or dust buildup on the windshield reducing lubrication, or incorrect wiper installation angle causing excessive pressure. For solutions, I recommend first checking the wiper blades for cracks or wear—replacing them is cost-effective and works well. Cleaning the glass with a professional degreaser can save trouble, and parking in shade helps delay aging. In winter, cold weather makes this issue more common, so regular checks on wiper blades and arm pressure are advisable. From a safety perspective, persistent noise can distract drivers, especially in rain when visibility is crucial. I replace my wiper blades every six months to ensure peace of mind while driving.
