my Volkswagen Golf MK7.5 (2020-Present) makes a whining noise when driving

Solution

1. Preparation

• Tools Required: OBD-II scanner, mechanic's stethoscope, jack, jack stands, socket set, torque wrench.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the battery to prevent any electrical issues while working.

2. Inspect and Replace Drive Belts

• Sub-steps:
  1. Remove the engine cover (if applicable) to access the serpentine belt.
  2. Loosen the tensioner using a socket wrench and remove the belt.
  3. Inspect the belt for cracks, fraying, or glazing. Replace if necessary.
  4. Install the new belt, ensuring it is properly aligned on all pulleys.
  5. Reapply tension to the belt using the tensioner and confirm proper tension.

3. Check and Replace Fluid Levels

• Sub-steps:
  1. Check the transmission fluid level using the dipstick (if applicable) and add fluid as needed.
  2. Inspect the power steering fluid reservoir and top off with manufacturer-recommended fluid.
  3. Check the differential fluid level and replace if low or contaminated.

4. Inspect and Replace Faulty Components

• Sub-steps:
  1. If the noise is traced to the alternator or power steering pump, remove the defective component.
  2. Replace with a new or refurbished part, following the manufacturer's specifications for torque values.
  3. Reconnect all electrical connectors and hoses.

5. Inspect Wheel Bearings

• Sub-steps:
  1. Lift the vehicle using a jack and secure it on jack stands.
  2. Spin each wheel by hand to check for roughness or noise.
  3. If a bearing is defective, remove the wheel and hub assembly to access the bearing.
  4. Replace the bearing using a suitable press, ensuring proper alignment.