why does my Toyota RAV4 Fourth Generation (2013-2018) make a whining noise?

Solution

1. Preparation

• Gather tools and parts required for inspection and replacement.
• Tools Required: OBD-II scanner, multimeter, serpentine belt tool, fluid funnel, mechanic's stethoscope.
• Safety Warnings: Disconnect the battery before working on electrical components.

2. Inspect and Replace Serpentine Belt

• Inspect the serpentine belt for cracks, fraying, or signs of wear.
• If damaged, use a serpentine belt tool to remove the old belt.
• Install a new serpentine belt by following the belt routing diagram located under the hood. Ensure it is seated correctly on all pulleys.
• Torque specifications: Ensure all components are securely fastened according to manufacturer specifications.

3. Check and Refill Power Steering Fluid

• Locate the power steering reservoir and remove the cap.
• Check fluid level against the markings on the reservoir.
• If low, add the recommended power steering fluid type (typically ATF or specific fluid as per owner’s manual).
• Inspect for leaks around hoses and connections, and replace any damaged components.

4. Test and Replace Alternator if Necessary

• Using a multimeter, measure the alternator's output voltage with the engine running; it should be between 13.7 to 14.7 volts.
• If the voltage is below this range, consider replacing the alternator.
• Remove the alternator by disconnecting the battery, removing the serpentine belt, and unbolting it from the engine.
• Install a new alternator, ensuring all electrical connections are secure and tight.

5. Check and Change Transmission Fluid

• Locate the transmission dipstick and check fluid level; it should be within the marked range.
• If low or dirty, drain the transmission fluid using a drain pan, then replace it with the manufacturer-recommended fluid type.
• Refill fluid through the dipstick tube with a funnel until the correct level is reached.