Question about 1999 Ford Explorer

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Only when it is hot out a loud humming noise starts in the engine

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I suggest that you open the hood (when the engine is hot) and try to pinpoint the source of the noise. Check the power steering pump- these sometimes make a noise that could be described as a hum or whine. The alternator and belt idler or tensioner are other things to check. An automotive-type stethoscope might be useful for tracking down the noise.

Posted on Aug 22, 2010

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