Anyone experiencing/hearing rattling noise at idle from the passenger side of the car. The noise goes away under acceleration. I thought it was the drive-belts that needed changing an tension adjustment, however, after I replace the belts with the specified tension, the sound still there. It appears louder when the car is warm versus cold. Anyone have suggestions?

 

Belts squeal and are very noticeable. Also, they are louder when cold and diminish when warmed up.

the rattling noise you are talking about could be from an idler pulley possibly? Noises are very hard to diagnose without hearing them in person. In writing they are very difficult to describe.