I have an 07 379 sh, blower motor has been making a loud vibration and general rattle noise for the last few months, which got worse the higher the setting, but otherwise worked. Now that it’s -25 and snowing I’d like a little more piece and quiet. I took the old one out and found the wheel slot was rotted and loose, this causing the rattle. I had another blow motor and wheel so replaced it, I turned it on and it continued to rattle In the first and second setting before stopping completely. I took it out and found I had the wheel slightly to far down so moved it up a mm or so, and tried again to no avail, the old one did not work again either.
Fuses were good. What would cause it to lose power now all of a sudden?