how to fix my Volkswagen Tiguan First Generation (2007-2018) with a whining noise from the engine

Solution

1. Preparation

• Tools Required: OBD-II scanner, mechanic's stethoscope, belt tension gauge, socket set, torque wrench.
• Safety Warnings: Disconnect the battery before working on electrical systems. Allow the engine to cool before opening any components.

2. Replace Serpentine Belt

• Sub-steps:
  1. Locate the serpentine belt routing diagram (usually found on a sticker in the engine bay) for reference.
  2. Release tension on the serpentine belt using the belt tensioner tool.
  3. Remove the old serpentine belt from all pulleys.
  4. Compare the old belt to the new one to ensure proper size and length.
  5. Install the new serpentine belt according to the routing diagram.
  6. Reapply tension using the tensioner, ensuring it is properly seated on all pulleys.

3. Replace Worn Pulleys (if necessary)

• Sub-steps:
  1. Remove the serpentine belt as outlined in the previous step.
  2. Inspect each pulley for wear; if any pulley is damaged, remove it using a socket set.
  3. Install the new pulley and torque it to the manufacturer’s specifications (generally found in the service manual).
  4. Reinstall the serpentine belt as previously described.

4. Inspect and Replace Accessory Components (if necessary)

• Sub-steps:
  1. Identify the component making noise (alternator, power steering pump, or water pump) using the stethoscope.
  2. If a component is faulty, disconnect the battery and remove any electrical connections.
  3. Unbolt the component using the appropriate socket size.
  4. Install the new component, ensuring proper alignment and torque specifications are followed.
  5. Reconnect electrical connections and the battery.