Sour feet, cat urine, and red oak all have a very similar smell...
Check and change your ac filter. It's behind the glove box. And clean the evap coil like ken wood said. That should do the trick. Definitely sounds like you're getting some stagnant water in the drain pan. Check the drain if you can.
Also, i see your car is a '14. If it's under warranty, you can try letting the dealer deal with it.
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