Driving home a few weeks ago the heater blower suddenly stopped. I took it out and gently tapped the fins and it started again, tried to some silicon wd40 down the shaft, put it back in. It ran fine for a couple of days and then stopped, two weeks later just started mid driving, but wouldn't start when I next started the car. When it was working, the fan speed control all worked fine.

Question is, is this a failing motor, a stuck motor that needs lubrication, or a resistor problem.

I tend to think if the blower motor were to fail, it would just fail, this seems more like it's getting stuck, or seizing up a little. I have recently bought a power probe to bench test it to see if it spins every time off car but have not had time yet.

Thanks.