My blower motor doesn't seem to make a horrible noise, but because I am new to this car I have nothing to compare it to. My best description is to say it "purrs". That being said, it does not seem like it is blowing as hard as it should. When I turn on the defrost, I feel a decent amount of air come through the defrost vents. But, the normal vents seem a little weak. I would say that level 4 (high), seems like a 2-3. I checked the squirrel cage and it looked clean. So, I am thinking either a door is not opening or closing all the way to channel the air to the vents, or something may be clogged, thinking the old (input = output) logic. If enough air isn't coming in, enough won't blow out. Any thoughts?