Originally Posted by JohnsZ

Thanks Ken for the info but I'm sure it's mouse related or some other rodent especially given the fact that they found several acorns in the filter. Plus, there has always seemed to be a faint animal kind of smell in the interior so I want to make sure that a dead mouse is still not in there. I should have told you that it dosen't matter if the AC is on or not. You'll hear junk in the system just by turning on the fan. And it's weird because the noise isn't just one spot...you can hear dirt like debris moving around in different areas in the system which is especially noticeable when I turn up and then turn down the fan speed. Anyway I'll find out Thursday. Lets just hope that Sasquatch doesn't have a brother! Thanks for the AC info though