Hi all. New to the forum, have owned my '04 for just at one year now. I'm gonna replace the cabin air filter (no idea how old current one is) and am using a carbon-impregnated one for odor removal, but is there also maybe a drain for the condensation that happens when using the A/C, and maybe that drain is clogged and letting some moisture become rancid in the heater box? It's pretty stinky, like vinegar or maybe peroxide-smelling, especially when you first turn on the fan. But it doesn't ever go away completely. Thanks for your help, experience, and suggestions!