Is it a vinegar smell? Got it this morning when I started the air con. Only lasted a couple of seconds, but pretty annoying. I've read about it but hadn't experienced it until now.
Haven't had any rain in a month. It's been too hot to was the car, our daily temperature is 108F (42C).Have you washed your car or driven in the rain recently?
Mine makes the vinegar smell if there is too much water flowing down the windscreen and gets into the aircon intake vents.
Running the car aircon on full power for 20 minutes sorted it out.
It's not the screen wash. I haven't used the screen wash and from what I've read it is a known issue going back to the 2014 models. It looks like they replace the evaporator in the dash and some other aircon components. Some get the smell back and some do not. I'll book it in, I'm just not keen on them dismantling my dashboard.This "could" be a health hazard! I would ask the dealer to push MINI for a permanent resolution.
On the other hand, could it be your screen wash? I used to get rental cars in Hawaii and when you used the screen washers there was a real stink of rotten eggs.