My car has 157,000 miles, and is 5 years old and (this is going to sound strange) but when it is warm outside, or the sun is out after it is really cold, the car makes a creaking noise from what seems like right behind the back seat. I'd say it is the speaker box, but it made the noise before I changed my speakers and re assembled all that housing back there and it is still noisy. It isn't too loud....but it sure is annoying. There is a spot where 2 peices of plastic touch, so I put paper towels down in there, which seemed to muffle the problem for a day or too. Please help!