Simple little how to on replacing the brushes in your heater blower.
a set of new brushes.
Heater Blower fan carbon brushes audi a4 80 avant a3 on eBay (end time 05-May-11 21:01:09 BST)
Philips screw driver
Flat blade screw driver
Locate the glove box.
Remove the glove box
Remove this air bag bracket to give you room. You can see the holes where it was at the top of the image. 4 10mm bolts
Remove the 4 screws that holds the fan blower in place
Remove the fan blower
Remove the fan blower from its plastic housing. There is 3 black rubbery bits that holds the fan in to the larger plastic housing. Use the flat blade to gently push theses and release the fan.
Locate the two old brushes. The clip that keeps the spring in looks lie it does in the picture. Just to the left of it is the contact point with solder that you need to unsolder and remove.
Old brush Vs New brush
Once the two brushes has been removed and the solder all cleaned up you're left with this
Fit the new brushes, solder the cables and clip the springs back in.
Put it all back together and enjoy a working fan.