OK, I really don't know where to post this. When my car is turned off and I'm just sitting there, I hear what sounds like knocking coming from the trunk. I sound like a crazy person, but my girlfriend and brother both heard it. Lol I looked in mY trunk, no one is in there by the way. I have a tool box and other stuff, but nothing is loose to randomly make the noise. It knocks like 4-5 times usually. Any ideas of what is doing this?
2005 cobalt base model coupe