Why do I hear a speaking noise while my Explorer is running? It goes away for a while, then comes back....

Why do I hear a speaking noise while my Explorer is running? It goes away for a while, then comes back....

well, a new belt could work,. once there, check the bearings of the tensioner and every other pulley,. good luck, too many parts moving there thats why the noise coming and going, 4 years is time for a belt replacement for sure.