As I only have my Jetta 1 week today, I have a simple question. I noticed that sometimes when I open my door usually, I hear like a little motor sound off for about 2 seconds. What the heck is that? Sounds like it's coming from the trunk or something? Only happens when the car sits for a while. As if something warms up before going in. Any ideas??? Just trying to learn all these cool features the car has.