* Power Steering Pump: A failing pump can make groaning or whining noises, especially under load (like turning the wheel). The noise you describe might be from internal wear within the pump, or a belt slipping on a worn pulley.
* Power Steering Rack and Pinion: This is the mechanism that converts the steering wheel's rotation into wheel movement. Worn bushings or seals inside the rack and pinion can create squeaking, grinding, or rubbing noises, especially when turning. This is a common source of the rubber-on-rubber sound you're hearing.
* Power Steering Fluid Level: Low power steering fluid can cause the pump to work harder and make noise, or even cause damage. Check your fluid level immediately. It's usually a reservoir with a dipstick, often near the pump. If it's low, add the correct type of fluid (consult your owner's manual).
* Steering Rack Boots: These rubber boots protect the rack and pinion from dirt and debris. If they're torn or damaged, the rack can be exposed, leading to noises as it rubs against things.
* Belt Tensioner or Idler Pulley: While less likely to cause a *rubbing* sound specifically during steering, a worn belt tensioner or idler pulley can make noises that are mistaken for power steering issues, especially if the power steering pump is belt-driven.
How to troubleshoot:
1. Check Power Steering Fluid: This is the easiest and safest first step. Add fluid if needed (but don't overfill). See if the noise improves.
2. Listen Carefully: Try turning the steering wheel slowly and then more quickly. Does the noise change in pitch or intensity? This can help pinpoint the source.
3. Visual Inspection (with caution): Carefully inspect the power steering fluid reservoir, pump, hoses, and the area around the steering rack for any leaks, damage, or obvious wear. You might see cracks in the boots. Do not attempt to work on the steering system while the car's engine is running!
4. Professional Inspection: Given the noise description and potential severity, it's highly recommended to take your car to a qualified mechanic. Diagnosing and repairing power steering issues requires expertise and specialized tools. Ignoring the problem could lead to more significant damage and expensive repairs.
Safety Note: Driving with a noisy and potentially failing power steering system is risky. If the steering becomes difficult or unresponsive, pull over immediately and have the vehicle towed.
