why does my Volkswagen Golf MK5 (2004-2008) make a whining noise when accelerating?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Serpentine Belt

• Tools Required: Socket set, belt tensioner tool
• Sub-steps:
  1. Locate the serpentine belt routing diagram (usually found on a sticker in the engine bay).
  2. Use the belt tensioner tool to relieve tension on the serpentine belt.
  3. Remove the old serpentine belt from the pulleys.
  4. Inspect the pulleys for wear; replace if necessary.
  5. Install the new serpentine belt according to the routing diagram.
  6. Reapply tension using the belt tensioner tool and ensure proper alignment.

3. Inspect and Replace Alternator or Power Steering Pump

• Tools Required: Socket set, multimeter
• Sub-steps:
  1. Test the alternator output using a multimeter; it should read between 13.8 to 14.4 volts when the engine is running.
  2. If the alternator is faulty, remove it by disconnecting the wiring harness and unbolting it from the engine.
  3. Replace with a new alternator and reconnect all wiring.
  4. For the power steering pump, check fluid levels and inspect for leaks.
  5. If the pump is making noise, remove it by unbolting and replacing it with a new unit.

4. Check Transmission Fluid

• Tools Required: Transmission fluid dipstick, funnel
• Sub-steps:
  1. Locate the transmission fluid dipstick and remove it.
  2. Check the fluid level; add fluid if low.
  3. If the fluid is dark or has a burnt smell, consider a fluid change.