We'll I've had this car for almost two years and we are still going!

The blower motor stopped working in the span of about two months, then not at all. At first it was an intermittent failure at any fan speed, then stopped altogether. Makes it pretty hard to see here in Michigan when the weather gets (WAY) below freezing.

My first inclination was the switch, but then reading I see the resistor may be the problem. The blower it self never got loud or weird sounding.

What is the best troubleshooting method for this?

And thanks for everything!

 

Use a test light at the motors connector to see if you have power to the motor.

 

If you happen to discover that it is the resistor, please see the following guide. I followed this guide when I was seeing similar behavior to what you're describing, although my blower would work, but only on the highest speed setting.

Blower Resistor Repair Guide 850/s,v70 - FWD/AWD 1998 and Prior - Volvospeed Forums

I repaired the resistor with a new fuse and solder, and I haven't seen the issue reoccur in over a month. I had to have a working blower motor in Minnesota with the weather through the winter, and so far so good.