I only noticed this about two months ago when I was scraping ice off the windows. This is a high pitched noise that I couldn't hear if I was inside with windows all up. It doesn't change with speed, and it's consistently there as I shift from P to D, R, etc. Turning the steering wheel doesn't affect it. I really don't think it's normal, but I want to see if any of you guys are experiencing this. Thanks in advance.