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Mercedes Benz 1999 e430 makes a loud humming noise when idle and reverse but not drivingwhen you come to a stop and put it in neutral it stops but seems to be getting louder as time goes on?

Anonymous

∙ 15y ago

Updated: 10/27/2022

Check your radiator. From your description your car might be overheating, due to poor air intake at low speeds.

Wiki User

∙ 15y ago

What else can I help you with?

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