As some of you know, this last weekend I towed a 95 Neon ACR on a full car trailer from Des Moines Iowa to St. Louis. I don't know when exactly it started, but now there's a sound coming from my engine bay. It sounds sorta like a Supercharger Belt, but also sounds sorta it's sucking air in from somewhere. However, when I'm at Highway/Interstate speeds, I can't hear it. I haven't opened the engine bay, but it sounds like it's coming from the front. Any ideas?