Noise When running

2004 MERCURY MOUNTAINEER
115 MILES
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RONS1269
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  • 1 POST
We have an 8cyl AWD Premier Model. The mechanics have looked and looked and cannot isolate it. We took it to the dealer, they have no idea either.
The car makes a humming/whining sound when its idling and when you are driving it, never gets any louder but is always there. It sounds like a power steering pump going out when you turn the wheels, Thats the noise it makes, The mechanics have promised me it is NOT the pump because it does it ( makes the noise) weather you turn the wheel or not.
Mar 8, 2012 at 6:43 PM
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JACOBANDNICKOLAS
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  • 110,175 POSTS
Remove the belt and see if the sound goes away. If it does, then you know it is a belt driven accessory. NOTE: Do not run the engine for longer than a few seconds with the belt off.
Mar 8, 2012 at 10:04 PM