Water pumps go bad and begin to leak water. If that is not the case (and bad water pumps rarely make a loud noise unless the bearings went really bad) I would check to see if the exhaust manifold is cracked by listening with the hood open to see if you can locate the noise in the area where the exhaust comes off the engine block.
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Water pumps go bad and begin to leak water. If that is not the case (and bad water pumps rarely make a loud noise unless the bearings went really bad) I would check to see if the exhaust manifold is cracked by listening with the hood open to see if you can locate the noise in the area where the exhaust comes off the engine block.