What is this rattling noise by by accessory pulleys that gets louder as I idle?

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I recently had mechanics add a timing belt kit that included water pump, coolant flange, tensioner, thermostat, and belts. I've only driven it twice since Sunday and less then 10 miles. First day was okay but now it sounds like a rattling noise or clinking as I idle the car and gets louder as i push on pedal. The noise goes away when I turn wheel.