my BMW 3 Series G20/G21 (2019-2024) wipers leave streaks when it rains, what should I do?

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1 hour

Time

medium

Difficulty

medium

Severity

3 min read

518 words

Problem Statement

The windshield wipers on a BMW 3 Series G20/G21 (2019-2024) leave streaks on the glass when it rains, indicating a possible issue with the wiper blades or windshield condition.

Estimated Time

1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical components to prevent accidental wiper activation.

Symptoms

•Streaks left on the windshield during operation
•Wipers skipping or chattering across the glass
•Reduced visibility in rain
•Wiper blades appear damaged or worn
•Noisy operation of wiper mechanism

Diagnostic Steps

1
Inspect the wiper blades visually for signs of wear, such as cracks or tears.
2
Clean the windshield thoroughly to remove any debris or contaminants that may affect wiper performance.
3
Check the wiper arm tension to ensure they are making proper contact with the windshield.
4
Test the wipers on a dry windshield to see if they operate smoothly without skipping.
5
Examine the windshield for scratches or other imperfections that could contribute to streaking.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Sub-steps:**
•Lift the wiper arms away from the windshield to a vertical position.
•Locate the release tab on the wiper blade where it attaches to the wiper arm.
•Press the release tab and slide the wiper blade off the wiper arm.
•Align the new wiper blade with the wiper arm and slide it into place until it clicks.
•Lower the wiper arm back to its resting position.

Parts Required

•New windshield wiper blades

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Diagnostic Steps

1
Inspect the wiper blades visually for signs of wear, such as cracks or tears.
2
Clean the windshield thoroughly to remove any debris or contaminants that may affect wiper performance.
3
Check the wiper arm tension to ensure they are making proper contact with the windshield.
4
Test the wipers on a dry windshield to see if they operate smoothly without skipping.
5
Examine the windshield for scratches or other imperfections that could contribute to streaking.

Solution

1. Preparation

Gather all necessary tools and parts.
Park the vehicle on a level surface and turn off the engine.
Disconnect the battery to avoid accidental wiper operation.

2. Replace Wiper Blades

Tools Required: Flathead screwdriver, socket set
Sub-steps:
1. Lift the wiper arms away from the windshield to a vertical position.
2. Locate the release tab on the wiper blade where it attaches to the wiper arm.
3. Press the release tab and slide the wiper blade off the wiper arm.
4. Align the new wiper blade with the wiper arm and slide it into place until it clicks.
5. Lower the wiper arm back to its resting position.

3. Clean the Windshield

Tools Required: Glass cleaner, microfiber cloth
Sub-steps:
1. Spray a quality glass cleaner on the windshield.
2. Use a microfiber cloth to wipe down the entire surface, removing dirt and oils.
3. Inspect the windshield for any remaining contaminants and repeat cleaning if necessary.

4. Adjust Wiper Arm Tension

Tools Required: Torque wrench
Sub-steps:
1. Remove the wiper arm by loosening the retaining nut with a socket set.
2. Adjust the position of the wiper arm to ensure it sits flush against the windshield.
3. Re-tighten the retaining nut to the manufacturer's specified torque value (typically around 10-15 Nm).
4. Test the wipers to confirm proper contact with the windshield.