What Causes the Lower Part of the Left Wiper to Shake on a New Car?
3 Answers
Impurities or foreign objects on the wiper blade or glass surface can cause noticeable resistance when the wiper reaches certain positions, leading to shaking. Below is relevant information about wipers: 1. Operating Principle: The power source of the wiper comes from the motor, which is the core of the entire wiper system. The quality requirements for the motor in wipers are quite high. Typically, a DC permanent magnet motor is used, and the wiper motor installed on the front windshield is usually integrated with the worm gear mechanical part. The worm gear mechanism serves to reduce speed and increase torque, with its output shaft driving a four-bar linkage mechanism that converts continuous rotational motion into a left-right oscillating motion. 2. Basic Introduction: The wiper is a blade-like structure installed in front of the windshield, composed of a motor, reducer, four-bar linkage mechanism, wiper arm spindle, and wiper blade assembly. Its main function is to clear rain, snow, and dust that obstruct the view on the windshield.
I've encountered this before! New car wiper judder is mostly due to assembly issues or oil film on the windshield. Check if the wiper rubber is deformed—prolonged compression during transport can cause uneven rebound. Also inspect the windshield; if the dealership didn’t fully remove the protective wax before delivery, the wipers will "dance." Another hidden issue: excessive spring pressure in the wiper arm. New car springs are stiff, and if the lower section presses too tightly, friction resistance skyrockets. Try using a glass cleaner to thoroughly remove oil film and observe if the rubber fully contacts the windshield. If it’s a simple fix like replacing the wiper rubber, consider buying branded silent-type rubber strips and DIY—it’s cost-effective and quick.
Don't rush to replace parts if your new car's left wiper is shaking—focus on these two areas: First, check the wiper arm installation angle. Some new cars may have linkage connection point deviations during assembly, causing abnormal pressure distribution during downward motion. Second, though rare, inspect the windshield curvature—some models may have insufficient glass flatness. Perform a water pouring test to check if the water film slides down evenly. I've seen cases where vibration was caused by reversed rubber blade installation, so pay attention to the directional arrow during installation. Temporary solutions: Spray washer fluid before rain for lubrication, or lightly sand the rubber blade edge burrs with fine sandpaper. If shaking persists after three weeks, it's more convenient to directly request wiper arm torque adjustment from after-sales service.
