i have a 1997 328i w/ 89k miles. i just replaced my climate control head unit b/c it was intermitently coming on and going off. this was just two weeks ago and everything was fine, but now the blower doesnt work at all. the rear defrost works, the a/c compressor is engaging and all the digital displays on the control unit itself seem fine. so i know the control unit is still working, but there is NO air moving at all. i've read through several of similar posts saying the problem might be the "final stage unit." please help with any ideas.