* Wheel Bearing: This is the most likely culprit. A failing wheel bearing will often produce a buzzing or humming sound that increases with speed. The sound is more pronounced when the wheel is under load (driving straight or turning left, putting weight on that bearing). Turning right takes the load off that bearing, hence the silence.
* Brake Caliper: A sticking or slightly seized brake caliper could cause a dragging brake pad, resulting in a buzzing or grinding sound. Again, this would be worse when the wheel is under load (driving straight or turning left).
* CV Joint (Constant Velocity Joint): A worn or damaged CV joint, especially the inner joint on the left side, can produce a buzzing or clicking sound, particularly under load and during turns. The sound might be less noticeable or absent when turning right as the stress on that joint is reduced.
* Loose or Damaged Parts in the Suspension: Something loose in the suspension, like a bolt or a worn ball joint, could vibrate and create a buzzing sound, especially under load or when the suspension is flexed during turning.
* Tire Issues (less likely): While less likely to be directional like this, a severely unbalanced tire or a tire with a developing separation could produce a vibration felt and heard as a buzz. However, this would likely be present regardless of the direction of turning.
Troubleshooting Steps (in order of likelihood):
1. Check the Wheel Bearing: This is the first thing to investigate. Jack up the front left side of the car safely, support it securely, and then try to wiggle the wheel at the 3 and 9 o'clock positions. Excessive play indicates a bad bearing. You can also try spinning the wheel and listening for any rough sounds or resistance.
2. Inspect the Brakes: Carefully examine the brake caliper and pads on the left front wheel for any signs of seizing, rust, or damage.
3. Check the CV Joint: Look for any grease leaks or damage to the CV boot. While it's difficult to definitively diagnose a bad CV joint without removing it, you can try gently moving the joint to feel for any play or resistance (again, jacking the car up safely).
4. Inspect the Suspension: Look for any loose bolts, worn bushings, or damaged suspension components on the left front side.
If you're not comfortable performing these checks yourself, take your Cavalier to a mechanic for a proper diagnosis. Ignoring these issues could lead to more significant and expensive damage.
