The AC on my 02 M5 would go out sporadically then eventually quit together, even though none of the components seemed to be experiencing difficulty. I searched through m5board dot com and this piece seemed most likely to be the culprit. I ordered it and it was sent to me pretty quickly. I read through a DIY, popped it in place, and my AC worked again. Another reviewer seemed to get one that didn't last long so I'll update my review if it only lasts a few months, but so far, so good. If you don't mind doing things yourself, this is great value compared to taking it to a dealership and paying more than double just for the diagnostic.