* Power Steering Pump or Lines: A failing power steering pump can make groaning, whining, or rubbing noises, especially at low speeds when the pump is working harder. Leaking power steering fluid can also lead to a similar noise as the pump struggles. Check the fluid level and look for leaks around the pump and lines.
* Power Steering Rack and Pinion: The rack and pinion is the mechanism that converts the steering wheel's rotation into movement of the wheels. Worn seals, low fluid, or damage within the rack and pinion can cause rubbing or grinding noises, particularly at low speeds and when turning.
* Steering Column: While less common, a problem within the steering column itself (bearings, universal joints) could contribute to a rubbing sound.
* Suspension Components (Ball Joints, Tie Rod Ends): Worn ball joints or tie rod ends can create a clunking or rubbing noise, especially when turning. These components connect the steering linkage to the wheels and suspension. Inspect them for excessive play or damage.
* Brake Caliper: Though less likely, a sticking brake caliper could cause a rubbing noise, especially if it's dragging slightly. This would be more noticeable when turning one way than the other.
* Wheel Bearings: While usually associated with a humming or growling sound, significantly worn wheel bearings could contribute to a rubbing noise under certain conditions, including turning.
Troubleshooting Steps:
1. Check Power Steering Fluid: This is the easiest and quickest check. Low fluid is a common cause.
2. Listen Carefully: Try turning the steering wheel slowly while someone listens carefully to pinpoint the location of the noise.
3. Visual Inspection: Look for any obvious leaks around the power steering pump, lines, and rack and pinion. Inspect the steering linkage components (tie rod ends, ball joints) for play or damage.
Important Note: If you're not comfortable performing these checks yourself, it's best to take your Grand Prix to a qualified mechanic for diagnosis and repair. Ignoring these types of noises can lead to more serious and expensive damage.
