02 mountaineer with a bad noise from the belt you replaced the belt the idler pulley and the tensioner pulley any ideas?

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If you have replaced the belt, tensioner and idler pulleys, then the problem could be the water pump bearing, alternator bearing, camshaft bearings, power steering pump or any of the items attached to the serpentine belt.

You may try to isolate the sound by listening with a length of rubber hose and place it near the areas where the 'noise' you hear may be emanating from. Just be careful not to get the hose too close to the engine fan or belts as it can get caught and cause damage or injury.
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