why does my Volvo XC60 First Generation (2008-2017) make a whirring noise when starting

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, battery terminal cleaner, screwdriver set.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Clean Battery Connections

• Remove the positive and negative battery terminals.
• Clean the terminals and battery posts using a battery terminal cleaner.
• Reattach the terminals securely and ensure a solid connection.

3. Test and Replace Battery (if necessary)

• Sub-steps:
  • Use a multimeter to test the battery voltage. If below 12.4 volts, charge or replace the battery.
  • If replacing, ensure the new battery matches the required specifications (group size, cold cranking amps).
• Reconnect the battery terminals.

4. Inspect and Replace Starter Motor (if faulty)

• Sub-steps:
  • Locate the starter motor. Usually found near the engine block, accessible from underneath the vehicle.
  • Remove the electrical connections from the starter motor.
  • Unbolt the starter motor using a socket set.
  • Replace with a new starter motor, ensuring the alignment is correct.
  • Torque bolts to manufacturer specifications (typically 15-25 ft-lbs).

5. Check and Replace Starter Relay (if necessary)

• Sub-steps:
  • Locate the starter relay in the fuse box (refer to the owner’s manual for exact location).
  • Remove the relay and test it using a multimeter for continuity.
  • If faulty, replace with an identical relay.

6. Verify Ignition Switch Functionality (if needed)

• If the above steps do not resolve the issue, consider inspecting the ignition switch.
• Remove the ignition switch and test for proper operation or replace if defective.