I bought an '07 Prius 3 weeks ago and I love it. This past weekend I changed the cabin air filter (it WAS filthy) and all went well, EXCEPT I now get an annoying fan/blower noise. Any thoughts as to why this happened and what to do would be appreciated. Gary
Filter upside down? A piece of junk getting into the duct and thence the fan during the filter swap seems most likely. Open 'er up again and have a look.