my BMW 3 Series makes a whining noise when accelerating what is wrong

Solution

1. Preparation

• Gather all tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Serpentine Belt

• Tools Required: Socket set, torque wrench, serpentine belt tool.
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Use the serpentine belt tool to relieve tension on the belt and remove it from the pulleys.
  3. Inspect the belt for cracks, fraying, or excessive wear.
  4. If damaged, replace with a new serpentine belt, ensuring correct routing around pulleys.
  5. Re-tension the belt and reattach any components removed.

3. Check and Top Off Fluids

• Tools Required: Funnel, fluid containers.
• Sub-steps:
  1. Locate the transmission dipstick and check the fluid level; add fluid if low.
  2. Check the power steering fluid level and top off as needed.
  3. Inspect for leaks around seals and connections.

4. Inspect and Replace Mounts (if necessary)

• Tools Required: Jack, jack stands, socket set, torque wrench.
• Sub-steps:
  1. Safely lift the vehicle using a jack and secure with jack stands.
  2. Inspect transmission and differential mounts for signs of wear or cracking.
  3. If mounts are damaged, remove the bolts securing them and replace with new mounts.
  4. Torque bolts to manufacturer specifications.

5. Test Drive

• After completing repairs, take the vehicle for a test drive to ensure the whining noise has been resolved.