my Volkswagen Golf MK6 (2009-2014) makes a whining noise when I accelerate, what's wrong?

Solution

1. Preparation

• Tools Required: Socket set, OBD-II scanner, jack and jack stands, wrench set, stethoscope, or mechanic’s ears.
• Ensure the vehicle is parked on a level surface and the engine is cool. Disconnect the battery for safety.

2. Inspect and Replace Engine Belts

• Sub-steps:
  1. Remove the engine cover (if equipped) using the socket set.
  2. Inspect the serpentine belt for any signs of wear or damage.
  3. If damaged, loosen the belt tensioner and remove the old belt.
  4. Install a new belt following the routing diagram usually found on a sticker in the engine bay.
  5. Tighten the tensioner to the manufacturer's specifications.

3. Check and Change Transmission Fluid

• Sub-steps:
  1. Locate the transmission fluid dipstick or fill plug.
  2. Remove the dipstick/fill plug and check the fluid level.
  3. If low, add the appropriate type of transmission fluid (check the owner’s manual).
  4. If the fluid is discolored or has a burnt smell, perform a transmission fluid change.
  5. To change fluid, drain the old fluid from the transmission pan, replace the filter, and refill with new fluid to the correct level.

4. Inspect and Replace Alternator or Power Steering Pump

• Sub-steps:
  1. Use a stethoscope to pinpoint noise from the alternator or power steering pump.
  2. If a bearing is failing, remove the accessory drive belt.
  3. Remove the alternator or power steering pump using the wrench set.
  4. Replace with a new component and ensure all connections are secure.
  5. Reinstall the accessory drive belt.