Does the smell somewhat resemble cat urine? My money is on bacteria on evaporator core. Many cars have issue where running ac and the Evap core doesn't completely drain all the way and the water causes bacteria to grow.
Anyway believe it or not they make something to cure it. Go to autoparts store or online and order Evap core cleaner. It comes in a spray can, has a little tube. You put that tube into the Evan core drain line under the car and spray backwards through the drain. The foam will expand up into Evap core and get rid of your smell. The fresh scent of cleaner only lasts a day or so but it flushes out bad stuff.
Then to prevent this in future your options are to flush again when needed or the other way is when your close to destination turn OFF your ac and drive with just blower on for the last mile or 2 this will allow the core to dry each time this preventing the mildew issue.
Last time I bought it I ordered from orieleys.
Oops didn't see post above. What he posted is what I was talking about.
Last edited by Kenwoodturbo; 03-07-2014 at 08:45 PM.
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