Motor started making noise yesterday and today stopped spinning. It is making a lot of noise, whining trying to get started. I cleaned a bunch of the lint and grime off the motor and it blew hard for a while. But the next time the furnace kicked on it didn't blow again. Making noise so I shut it down. I know the obvious thing is that this very old unit and should be replaced but does this sound like a motor issue? Let me know the next step.