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Why does the engine of my Mercedes 190E produce a whining noise - even with auxiliary belt removed?

A whining noise coming from the engine of a Mercedes 190E, even after the auxiliary belt has been removed, can have a few potential causes:

1. Power Steering Pump: The power steering pump is driven by the engine and can generate a whining noise if it's faulty. Check the power steering fluid level and condition; a low fluid level or deteriorated fluid can cause the pump to make noise.

2. Alternator Bearing: The alternator, which is responsible for generating electricity, has bearings that can wear out and produce a whining sound.

3. Water Pump Bearing: The water pump, which circulates coolant through the engine, also has bearings that can become worn and make a whining noise.

4. Damaged Engine Components: In rare cases, internal engine components, such as worn timing gears or faulty transmission parts, can create a whining noise that may persist even with the auxiliary belt removed.

5. Loose or Misaligned Components: Double-check that all engine components, such as pulleys, are securely fastened and aligned correctly.

6. Wind or Resonance: While unlikely, it's possible that a particular engine component or part is causing a resonating sound that is being amplified or transmitted to the cabin through other components or airflow.

Without directly inspecting and diagnosing the vehicle, it can be challenging to pinpoint the exact source of the noise. If you have mechanical knowledge, you can visually examine the engine components and listen carefully for the origin of the noise. However, it's highly recommended to consult a professional mechanic who has the necessary expertise and tools to accurately identify and address the issue, ensuring the proper functioning of your vehicle.