Sorry to Hijack this, I had similar problem. My fan will blow consistently well when at lowest setting and usually well when at second setting, but when blowing at third speed and top speed the fan will eventually stop. usually after about 5-10 seconds. I can sometimes even smell something burning as if the fan is rubbing on something, but there is no squeaking or odd sounds. Just normal hard blowing cold A/C, then gradually slows down to nothing after 5-10 seconds. I have already replaced the resistor with no improvement. I was going to replace the blower next, but thought I'd check on here for alternative diagnosis. This happens whether on A/C, heater, or with the in-cabin recirculation on or off. Any ideas?