1. Check the Wiper Blades:
* Worn Blades: This is the most common cause. Worn or damaged wiper blades can lose their flexibility and ability to smoothly traverse the windshield. Look for cracking, tearing, or a buildup of debris on the rubber. Replace them with blades specifically designed for your vehicle's make and model. You can find these at most auto parts stores.
* Bent Arms: Carefully inspect the wiper arms themselves. If they're bent, they won't make proper contact with the windshield, leading to overlapping and sticking. Sometimes, gentle bending back into place can work, but be cautious not to break them. If bent significantly, replacement is likely needed.
* Blade Installation: Ensure the wiper blades are correctly attached to the wiper arms. Sometimes, improper installation can cause them to rub against each other. Check your owner's manual or look for online guides showing the correct installation procedure.
2. Check the Wiper Arm Pivot Points:
* Lubrication: Over time, the pivot points of the wiper arms can become stiff and dry. Apply a small amount of silicone-based lubricant (NOT WD-40 – it can attract dirt) to these points. Move the wiper arms back and forth a few times to distribute the lubricant.
* Corrosion: If the pivot points show signs of rust or corrosion, this can restrict movement. Try cleaning them carefully with a wire brush and then applying lubricant. If corrosion is severe, you may need to replace the wiper arms.
3. Check the Wiper Motor and Linkage:
* Motor Problems: A malfunctioning wiper motor can cause inconsistent movement, potentially leading to overlapping. This is less likely to cause *only* overlapping, but if you have other wiper problems (like intermittent wiping not working) then this could be a factor.
* Linkage Issues: The linkage that connects the motor to the wiper arms can also be a source of trouble. This requires more mechanical expertise and often involves removing parts to inspect. If you're not comfortable with this, take it to a mechanic.
4. Windshield Condition:
* Scratches or Debris: Deep scratches or large debris on the windshield can interfere with the smooth operation of the wipers.
5. Frozen Wipers (Seasonal):
* In cold weather, ice can build up and cause the wipers to stick and overlap. Make sure to clear the ice and snow completely before operating your wipers. Using a de-icer spray can be helpful.
Troubleshooting Steps:
1. Start with the blades. Replacing worn blades is the cheapest and easiest solution and often solves the problem.
2. Check the arm pivot points. Lubrication is simple and inexpensive.
3. If the problem persists, then you may need to investigate the motor and linkage, which is more involved. Consider taking it to a mechanic at this point.
Important Note: Before working on your wipers, always disconnect the negative battery terminal to prevent accidental electrical shocks.
