Blower motor not blowing

This weekend my sister picked up a 1987 325i cabriolet for a good price (free). It's going to be her car, but I'm going to be the one working on it. Newish paint, new leather interior, Recaro seats, new canvas top, generally fair to good condition mechanically.

Besides the control arms and bushings that I'll be replacing next weekend, the blower motor doesn't work. Everything lights up the way it should, and I hear relays clicking under the dash, but no joy from the vents. Fuses test good. Is there a more common failure point on these? Motor burns out? Switch goes bad? Relay goes bad? Any help anyone can provide on a starting point would be appreciated.

I'm a hobbyist, not a professional, and I'm much more familiar with the Mercedes 107 and 129 platform, but I need to learn about the e30 so I can work on this car for her. If anyone can point me to something like the shop manuals for the e30, that would also be great. I know the Haynes manuals for Mercedes stink, but MB makes their internal shop manuals available on CD. Is there anything like that for this car? Thanks in advance.

Here's a place to start and welcome aboard.

http://www.wedophones.com/BMWManualsLead.htm

As a teaser, section 6413 of the ETM has the schematic for the blower motor.

Does the blower motor work on any of the four fan speeds? If so, does it sound like you are killing a small bird in there? If it works only on speed 4, then it could just be the resistor. Here is how to change the resistor...

http://e30.bmwdiy.info/blower-resistor/index.html

Before I replaced anything, I would clean the resistor and motor really well with some electrical cleaner. My buddy actually used batter cleaner and his worked great afterwards and still does.

check the resistor. motor failure isnt uncommon. check to see if the plugs going to the motor are getting power.