A bit of background, my mom picked this 2014 CX-5 up about 5 months ago with 31,000km on it. She noticed that it had a very stuffy, dusty smell coming from the vents(the type of smell when you're following a car closely on a gravel road, spitting up dust). She took it to the dealer and they replaced the cabin air filter(it was BAD, it had never been changed before and had tree leaves, dirt, silt, pine needles etc. in it and was caked full of crap). She said the smell didn't go away, it just went down in severity, but says it's more or less, back again. Should I check the filter again, maybe not all the crap was collected? If so, where is the cabin filter on these cars?