I have a 2015 Mini S with about 28,000 miles. Just lately, when I turn on the AC, there is a sour smell, kind of like vinegar. It only last for a couple of minutes but seems to be getting stronger.
You might have mold and bacteria growing on the AC condenser. Also when was the last time you changed the cabin filter. That could be full of dirty and bacteria generating those smells.
There are several products which can help with this. Some as simple as using lysol/a disinfectant product on the cabin air intake and letting that kill off the goop. Some are more complicated where you hook up a product to the evaporator drain and it shoots some stuff up there to kill the goobs. I think the latter is probably the best option long term. After you've had the ac on and the cabin gets nice and cool there is a temperature and humidity difference between inside and out. Crack the windows a bit when you exit the vehicle to let the temperature imbalance even out more quickly. The fresh airflow will help to keep condensation down to a minimum and reduce the smell
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