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Rock rolling around, solved

Rock rolling around, solved

For at least a month, a rock had been driving me nuts—I could hear it rolling around during most every turn. I figured it out; perhaps this will help someone else:

After vacuuming and searching in vain, I finally realized that a small rock was likely trapped in the rear passenger’s foot vent (the one under the driver’s seat) where I couldn’t easily get to it, so I put the fan to 11 and accelerated hard up a hill to make it roll back, then pulled to a gentle stop; I put my hand in the vent et voila!—it was at the rear-most lip of the vent where I could feel it, and get it out.

2015 Model S 85D