I had a similar problem years back. I changed my A/C control unit (sword was fine) #1 in real oem http://www.realoem.com/bmw/showparts...68&hg=64&fg=45
here's a picture
http://i22.ebayimg.com/04/i/001/2c/66/5179_1.JPG
i think there's two types, one for with auto climate control and the other for without.