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Yes you can. I just did it myself.
I have a 2003 Mazda MPV. A few days ago my front AC blower stopped working on 1,2 and 3 speeds and would turn on only at 4 but then shuts off the compressor. After some research on the net, talking to the experienced mechanic and a visit to the Mazda Dealership I knew that the part that broke was the blower motor resistor and it is not sold separately - this is why it is not in the parts databases - it is a part of some plastic cover assembly behind the glovebox. The part that contains this resistor costs $99 plus tax (not including the installation). I was lucky enough to get a glance of the Mazda repair manual on how to change the resistor. Here is what you need to do:
First - Disconnect the battery by unplugging the ground (negative). Open the glove box half-way and gently pull forward the left bottom side until it pops out of the socket. The glove box is now removed. Behind it on the left side just in front, you will see a plug with 4 wires that is connected to the little plate that is being held by 2 screws. You will need a very short Philips screwdriver to undo them. Take out the plate and here it is - the front blower motor resistor. In my case I had to solder a little flexible stripe of metal back to where it was (there is some soldering residue left that gives you a hint) and plug it back in. Worked like a charm. My understanding is that this stripe of the metal was factory soldered under compression and worked like a fuse in case anything went wrong it would melt and disconnect.
A word of advise to all car owners: turn off AC, ac/heater blower, lights and radio and THEN shut off the engine. This way when you start the car - there will be less electric shock on all components and hence less chance that anything burns out.
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