Why does my car make a whining noise when I slow down?

Whirring or Whining

Whirring and whining noises often vary as the engine runs fast or slow, and they can indicate a number of different problems, including a failing water pump, a bad power steering pump, low power steering fluid, a failing alternator, or problems with the air-conditioning system. via

What causes a whining noise when decelerating?

A “whirring” noise while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload. This condition is typically always diagnosed as a bad ring and Pinion gear. via

Why does my car makes a noise when I decelerate?

Check the brake system and see if the caliper or rotor is damaged on the driver side wheel. Since the noise only occurs when decelerating to a stop, then there could be an issue with the brakes. via

Why does my car make a noise when I put it in gear?

Worn Clutch: If you have a manual transmission, the clutch may be worn out. This would make a screeching/grinding noise when attempting to put the car in gear. Failing Pilot Bearing: This problem is only pertinent to manual transmissions and only when engaging the clutch (pressing the clutch pedal in). via

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