* Power Steering Pump: This is the most likely culprit. A whining power steering pump often gets louder as you turn the wheel and/or increase speed (higher RPMs). Check the power steering fluid level. Low fluid can cause whining and damage the pump. If the fluid level is low, top it off and see if the noise reduces. *However, if the fluid is low, it already indicates a potential leak and further pump damage*.
* Alternator: While less common to whine, a failing alternator bearing can produce a high-pitched whine that increases with engine speed. Check the alternator belt for wear and slippage.
* Water Pump: A failing water pump bearing can sometimes whine, though this is less typical than the power steering pump. Check for any leaks around the water pump.
* Belt Tensioner/Idler Pulley: Worn bearings in these components can create whining noises. Inspect them visually for any obvious damage or play (movement).
* Transmission: While less likely to cause a whine that increases directly with *engine* speed, a transmission problem could contribute. However, transmission issues often manifest differently (slipping, harsh shifting).
Troubleshooting Steps:
1. Check all fluid levels: Power steering, engine oil, and coolant. Low levels can exacerbate existing problems.
2. Listen carefully: Try to pinpoint the location of the whine. This can help you narrow down the potential source.
3. Inspect belts and pulleys: Look for cracks, fraying, or excessive wear on the belts. Check for play (movement) in the tensioner and idler pulleys by trying to move them slightly.
4. Test the power steering: Turn the steering wheel slowly from lock to lock while listening for the whine. If the noise is significantly louder during this test, the power steering pump is a prime suspect.
5. If possible, have someone else rev the engine while you listen: This can help isolate the source of the noise.
Important Note: Ignoring a whining noise can lead to more significant and expensive repairs. It's best to have a mechanic diagnose the problem as soon as possible. Continuing to drive with a failing power steering pump, for example, can result in complete pump failure leaving you without power steering.
