* Wheel Bearing: This is a very common cause of grinding noises. A worn wheel bearing will make a groaning or grinding sound, often increasing with speed. This is the most likely culprit.
* Brake Components: Worn brake pads or rotors can cause grinding, especially if the pads are completely worn down to the metal. This would likely be accompanied by other symptoms like a pulsating brake pedal or reduced braking power.
* Suspension Components: Worn ball joints, tie rod ends, or control arm bushings can create groaning or grinding sounds, especially when going over bumps or turning.
* CV Joint (Constant Velocity Joint): A failing CV joint, particularly the outer joint on the right front, can produce a grinding or clicking noise, often more pronounced during turns.
* Power Steering Pump or Rack: While less likely to cause a *grinding* noise specifically, a failing power steering pump or rack can produce groaning sounds. This would likely be more of a whine or groan, and may be related to steering input.
Troubleshooting Steps:
1. Check the obvious: Look for anything visibly wrong – loose parts, damaged components, leaking fluids (brake fluid, power steering fluid), etc.
2. Listen carefully: Try to pinpoint exactly where the noise is coming from. Does it change with speed? Does it change when turning? Does it change when braking? These clues will help narrow down the possibilities.
3. Jack up the vehicle (safely): Support the vehicle securely on jack stands. With the wheel off, check the wheel bearing for play. Try to grab the wheel at the top and bottom and rock it. Excessive movement indicates a worn bearing. Inspect the brake pads and rotors for wear. Inspect the CV joint boot for tears.
Recommendation: It's highly recommended to have a qualified mechanic inspect your Alero. Attempting to diagnose and repair these issues yourself can be dangerous, especially when dealing with suspension and braking components. The cost of a proper diagnosis is much less than the potential cost of an accident caused by a faulty component.
