I have a fairly new (bought in September of 2002, sole owner) Saturn SL2. Whenever I drive it for longer than just a few minutes, I noticed a sound when I have turned the car off and am walking away. It's a "tick tick tick" sound - I've heard it before on other cars, and always attributed it to the car cooling down. Is it normal for cars - new or old - to have these kinds of "settling" sounds after driving? Or is it a sympton of building problems?