When I start my car up in the morning when its cold outside, my car makes a whistling sound, and it comes from the engine, I suspect from the belts, but I could be wrong. It stops after it has warmed up for about 5 mins, then it goes away. I don't know if this questions been asked before, I'm sorry if it has, but, I'm curious as to what the noise is, and if its something to get worried over, thank you.