When I'm driving my 323i with my AC on everything seems fine, but when I shut off the AC on the coldest setting (16 degrees celcius (Canadian)) it smells very nasty inside my car, I need to shut off my vents, Does anyone know what the problem is? or if there is anything I can do about it myself because I am living 1500 km away from the nearest BMW dealership. Thanks for any help. Senad