Where is the protrusion on the left wiper?
2 Answers
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.
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.
