My 2003 gmc sierra keeps burning out blower motor resistors.

What is your question?

The problem only started this winter when I noticed the blower only worked on the highest setting. I replaced the hvac module with no change. Since then I have replaced the resistor twice. When I turn the fan on I get a distinct burning smell that smells like it is electrical. After that the resistor burns out in a few weeks leaving me with only the high speed setting.