Why does my 2020 Ford Explorer make a whining noise when accelerating?

Problem Diagnosis: Whining Noise During Acceleration in 2020 Ford Explorer

Possible Causes

1. Belt Issues: Worn or loose serpentine belt
2. Transmission Problems: Low transmission fluid or issues with the transmission itself
3. Differential Issues: Low fluid level or worn components in the rear differential
4. Wheel Bearings: Worn or damaged wheel bearings
5. Power Steering Pump: Failing power steering pump can produce whining sounds

Step 1: Visual Inspection

• Tools Required: Flashlight

1. Inspect the Serpentine Belt:

   • Look for cracks, fraying, or signs of wear.
   • Check if the belt is loose on the pulleys.

2. Examine the Fluid Levels:

   • Check the transmission fluid level using the dipstick; ensure it is at the correct level and has a red color.
   • Inspect the rear differential fluid level (if accessible).

Step 2: Noise Identification

• Tools Required: Mechanic's stethoscope (optional)

1. With the engine running, listen closely to the source of the noise.
2. Use a mechanic's stethoscope to pinpoint whether the sound is coming from the engine bay, transmission, or wheel areas.

Step 3: Test Driving

• Tools Required: OBD-II scanner (optional)

1. Take the vehicle for a test drive:

   • Accelerate gently to see if the noise occurs consistently.
   • Try turning left and right to check if the noise changes, indicating potential wheel bearing issues.

2. If equipped, scan for any trouble codes that might provide further insight.

Repair Instructions

Repair Option 1: Replace Serpentine Belt

1. Tools Required: Socket set, belt tensioner tool, replacement serpentine belt.
2. Instructions:
   • Disconnect the negative battery terminal.
   • Use a belt tensioner tool to relieve tension on the serpentine belt.
   • Remove the old belt and inspect pulleys for damage.
   • Install the new serpentine belt according to the belt routing diagram.
   • Reconnect the battery terminal.

Repair Option 2: Transmission Fluid Change

1. Tools Required: Transmission fluid, funnel, sockets, drain pan.
2. Instructions:
   • Raise the vehicle using jacks and secure it on jack stands.
   • Place a drain pan under the transmission pan and remove the drain plug (if applicable).
   • Allow old fluid to fully drain.
   • Replace the drain plug and refill with new transmission fluid through the dipstick tube using a funnel.
   • Start the engine and let it idle; check for leaks.

Repair Option 3: Inspect Wheel Bearings

1. Tools Required: Jack and jack stands, socket set, wheel chocks.
2. Instructions:
   • Lift the front or rear of the vehicle and remove the wheel.
   • Grasp the wheel at 12 and 6 o’clock positions and shake; if you feel play, the wheel bearing may need replacement.
   • If necessary, remove the hub assembly to access and replace the wheel bearing.

Repair Option 4: Check Power Steering Pump

1. Tools Required: Socket set, power steering fluid.
2. Instructions:
   • Inspect the power steering fluid level; fill if necessary.
   • Check for any signs of leakage or damage to the power steering pump.
   • If the pump is noisy, consider replacing it. Disconnect the battery, remove the pump belt, and unbolt the pump from its mounting.

Conclusion

After performing the above diagnostic and repair steps, re-evaluate the vehicle to ensure the whining noise has been eliminated. If the noise persists despite these repairs, further investigation into the transmission or differentials may be necessary, potentially requiring professional assistance. Always remember to refer to the vehicle’s service manual for specific torque specifications and procedures.