Is a fluttering sound from the under-car shield normal? Q: My wrench turning days are over, but I still enjoy reading about cars, so I enjoy your column every week. There's a fluttering noise ...

There's a fluttering noise under my car at 55 mph or higher. I bought the SUV Ford Explorer with 25,000 miles, and I noticed the noise right away. My mechanic said it was from a flexible shield under ...