blower replacement

I am looking for information on replaceing the heater blower on a 94 325is. Has anyone done this and what am getting into. The blower does not work, I am going to see if I am getting power to the blower. When I turn the control knob to 1,2,3,4 I can hear the vents opening and closing but the blower does no come on. I have checked the blower motor resistor and it seems to be fine. Any information would be very helpful.

Thanks

My blower works only on # 4. I want to change the resistor but I can't find it. Canyou help me to lokate it?
Thanks in advance.

Check behind the Micro filter. Take out its carrier as well. It'll look like two wheels on either end of a cylinder. that is where it is located on the e46 and e90