Where is the protrusion on the left wiper?

[StephenAnn]

Left wiper protrusion is the bulge at the connection point between the wiper arm and the wiper blade, typically used to determine tire position by the wiper node. Functions of the wiper node: Often used to judge wheel position marks, such as needing to know where the left wheel will pass over, to avoid tires pressing on solid lines or dodging potholes and stones on the road. Reasons for wipers not cleaning properly: 1. Wiper blade aging or hardening; 2. Foreign objects trapped between the wiper blade and windshield; 3. Dirty windshield with oil film; 4. Incorrect wiper arm angle; 5. Incorrect wiper usage. Solutions for unclean wipers: 1. Rotate the entire wiper bracket 180 degrees; 2. Adjust the pressure of the wiper arm against the glass by manually bending the swing arm.

[KevinDella]

Last time I had my car repaired, I encountered quite a few issues with the wiper protrusion. It's usually due to a deformed wiper arm or a loose mounting base. Think about it, the wiper arm can easily get deformed if it's hit by tree branches or if a car washer forcefully bends it, making it look like a protruding piece. Also, the shaft connecting the wiper motor at the base can become misaligned if the nut is loose or rusted. You should first manually move the wiper up and down to see if it's stuck, then check the arm for any signs of bending. If the deformation is inside the motor linkage, it's more troublesome and requires removing the rain tray cover to inspect. Don't force it, as it could scratch the glass. It's advisable to go to a repair shop early and have it checked on a lift. Spending a few dozen dollars to adjust it is better than waiting until the wiper flies off.

[EstherRose]

Don't panic if your wiper is raised, I've got experience to share. Last week, my neighbor's car had the same issue—turned out the wiper arm was installed off position. The mechanic said it happened when the wiper blade was replaced without aligning the slot properly, or someone accidentally bumped it after car washing. If you want to fix it yourself, first turn off the engine and lift the wiper arm to check if the U-shaped joint at the base has slipped out of track. Then try tightening the fixing nut with a wrench. If the entire linkage is deformed, there's no quick fix—last winter, my car's motor bracket got bent under heavy snow, causing a 2cm raise, and I had to replace the whole set. Remember to avoid parking near piles of branches or hail-prone areas, as foreign object impacts are the most common cause of damage.

[DiJessica]

The wiper protrusion is usually caused by a few reasons: the wiper arm is deformed and stuck, the mounting bracket is loose, the linkage is bent, or the motor is faulty. I recommend checking the most obvious issues first, such as whether the wiper arm has been bent by external force. Gently press the protruding area—if it doesn't move at all, internal components may be damaged. If it resets but becomes misaligned when running, it's likely the bracket screws are loose. Avoid disassembling it yourself, especially in modern cars where the wiper linkage is hidden beneath the windshield and requires professional tools to access the service port. I've seen cases where forcing the wiper straight caused the motor to fail, making repairs more expensive than replacement. For safety, it's best to have it professionally inspected.

[DeGraham]

These minor issues are the most annoying in daily car use. Wiper arm protrusion is often caused by improper handling. For instance, forcefully pulling when replacing wiper blades can displace the arm spring, leading to protrusion. Or long-term neglect in cleaning the wiper groove allows fallen leaves and debris to jam the linkage joint. I make it a habit to lift the wiper arm monthly to clean grit from the base, preventing rust and jamming. For temporary fixes, gently pushing the protruding part might help reset it—stop immediately if it doesn't budge. Once saw a friend crack their windshield with a rubber hammer while trying to fix it. Actually, adjusting wiper arm position takes just 10 minutes, and repair shops usually don't charge for it.

[AnthonyFitz]

A raised wiper arm signals mechanical linkage failure. When the four-bar linkage system connecting the wiper arm base to the motor deforms, force transmission imbalance causes the protrusion. It's like the stiffness when muscles remain tense after an arm fracture. This typically occurs from forcing frozen wipers to operate or hood pressure. I once disassembled a vehicle and found a 3mm heat warp in plastic linkage rods completely altered the motion path. Solutions include realigning linkage and motor angles; severely deformed parts require replacement with more durable aluminum alloy components. Northern drivers should service wiper mechanisms before winter to prevent freeze damage.