My car smells like a compost heap when I open the air vents… help!
Sounds like Mildew may have grown in them. Has it been wet?
When’s the last time you changed the cabin filter, if equipped?
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It might be compost. If leafy debris gets trapped in the cowl, or in the heater box, or plugs the drain from the AC housing, you’re on your way to a nice farmette. Mouse droppings can add local flavor.