* Wiper arm is incorrectly positioned: The wiper arm might be slightly out of alignment. Try adjusting it; sometimes a slight repositioning can make a big difference.
* Wiper blade is worn or damaged: A worn or damaged wiper blade won't make proper contact across the entire windshield. Replace the blade. This is the most likely cause.
* Wiper arm is bent: The wiper arm itself might be bent, preventing proper contact. Inspect it carefully.
* Windshield is warped or damaged: A slightly warped or damaged section of the windshield could be preventing proper contact. This is less likely but possible.
* Wiper motor issue (less likely): In rare cases, a problem with the wiper motor could cause inconsistent wiping, but usually, this results in more general problems than just a middle-of-the-window contact.
Troubleshooting steps:
1. Inspect the wiper blade: Check for wear, cracks, or damage. Replace it if necessary. This is usually the simplest and most effective solution.
2. Check the wiper arm: Look for any bends or misalignments. Try gently adjusting the arm's position.
3. Examine the windshield: Look closely at the area where the wiper blade isn't making contact. Is there any damage or warping?
4. Test the wiper with a new blade: If you've replaced the blade and the problem persists, you may need to investigate the arm or windshield more thoroughly.
If you've tried these steps and the problem continues, it's best to take your vehicle to a mechanic for a professional diagnosis.
