Originally Posted by
CBC
I'm probably not the best person to help with this, as I am newbie to the e34 world. However, I can tell you that the A/C control module (brain) is located under the dash, in the center, just in front of the microfilter (on top of the trans hump). I have a 95 e34, and I accesed the microfilter and control module by removing the glove compartment, air ducts, etc. It takes some time/work to get to it, but it can be done with a little patience.
Be sure to replace the microfilter while you are that far into the dash. I found the procedure for replacing the microfilter (and gaining access to the control module) within this forum. I think I just searched under "microfilter" and was able to find it.
Hope this helps.