* Power Steering Pump or Fluid: Low power steering fluid is a common cause. The pump may be failing, making a groaning or thumping sound as it struggles. Check the fluid level immediately. If it's low, add fluid (the correct type for your Alero) and look for leaks. A failing pump will eventually need replacement.
* Power Steering Rack and Pinion: This is a significant component. Worn-out rack and pinion gears can create thumping or knocking noises, especially when turning. This is a more serious and expensive repair.
* Steering Linkage: The tie rod ends, ball joints, or other parts of the steering linkage can wear out and cause a thumping sound when turning. These components connect the steering rack to the wheels. Worn parts create play in the system, leading to the noise.
* Suspension Components: While more likely to produce clunks than a consistent thump, worn-out ball joints, control arm bushings, or strut mounts can contribute to noises that are amplified when turning the steering wheel, especially if the impact is felt through the steering column.
* Wheel Bearings: Worn wheel bearings can produce a thumping noise, often more noticeable at higher speeds or when turning. This noise often changes with the speed of the vehicle, unlike some steering-specific issues.
Troubleshooting Steps:
1. Check Power Steering Fluid: This is the easiest and cheapest check. Look for leaks around the pump, lines, and rack.
2. Listen Carefully: Try to pinpoint where the noise is coming from (front left, front right, etc.). This will help narrow down the possibilities.
3. Steering Wheel Play: Check for excessive play or looseness in the steering wheel. Significant play is a major warning sign.
4. Visual Inspection: Carefully inspect the steering components, suspension parts (tie rods, ball joints, etc.) for obvious damage or wear. Look for anything loose, bent, or cracked.
5. Professional Inspection: If you can't identify the problem, take your Alero to a qualified mechanic for diagnosis and repair. Trying to fix this yourself without the proper knowledge and tools can be dangerous.
A thumping noise is not something to ignore. Continued driving with a damaged steering or suspension component can lead to loss of control and accidents. Get it checked out promptly.
