My van has been starting to make a whining noise. When I take my foot off the accelerator and let it roll the rest of the way to the corner even before I touch the brakes & hear this wind down noise. I thought it was my tires so I had them rotated. But it is still doing it. It kind of sounds like RRRRrrrrr. What do you think it is? I would just like an idea before I take it to a mechanic & they try to pull the wool over my head. Thank you for any help you can share.