Bought a Challenger last winter, decided to check coolant, found an acorn, so I decided to pull radiator and check it, glad I did, seems a chipmunk or mouse was set up good, pile of acorns and a nest. I only assume the previous owner pulled a used radiator from a junkyard, (Im sure its not the original judging by the wrong bolts used). Guess they didnt check the radiator before installing.