I recently returned home from a 600 mile trip, and while on the highway, there was a consistent squeak/rattle from the passenger side. It was extremely annoying to say the least. My other 2 passengers heard it, and we couldnt find anything to stop it. Has anyone else experienced this noise?? The thing i couldnt understand about it was it was happening on the interstate, the road was smooth.. i just dont know what it could be.

Not much in the way of help,but....http://www.chevymalibuforum.com/forums/showthread.php?p=14294#post14294

Anymore specifics as to a particular area it's coming from or over what kind of roads, etc.? Roof? Doors? Just somewhere on the side?

what vehicle is it, and what speeds.

its on the passenger side, either around the B pillar, or on the rear dash area. its annoying as hell, and it does it at highway speeds on smooth roads (doesnt make sense). its an 09 malibu with 10,000 miles.