* Worn wiper blades: This is the most common cause. Worn blades lose their flexibility and ability to conform to the windshield's curve, causing them to lift off. Replacement is the simple solution.
* Damaged wiper arms: The arms themselves might be bent or damaged, preventing proper contact with the glass. This could be from impact or age.
* Wiper linkage problems: The mechanism connecting the motor to the arms could be broken, jammed, or worn. This could involve worn joints, broken linkages, or a faulty motor.
* Windshield condition: A cracked or significantly warped windshield can prevent proper wiper contact. A small chip might not be noticeable but could disrupt the blade's seal.
* Incorrect wiper blade installation: If the blades weren't installed correctly, they might not sit properly on the windshield.
* Loose wiper arm: The wiper arm might be loose on its mounting point, causing it to lift off at higher speeds.
* Faulty wiper motor (less likely): While less common, a failing motor might not have enough power to press the blades firmly against the glass. This is more likely to manifest as slow or intermittent operation than completely lifting off.
To troubleshoot, start with the simplest solutions:
1. Inspect the wiper blades: Are they worn, cracked, or torn? Replace them if necessary.
2. Check the wiper arms: Are they bent or damaged?
3. Visually inspect the wiper linkage: Look for any obvious signs of damage or looseness.
4. Examine the windshield: Look for cracks or significant warping.
If the problem persists after checking these, it's likely a more complex mechanical issue within the wiper system and professional repair will likely be needed.
