Blower fan "Howling"

[1968 Valiant]

Can anyone tell me why my blower fan is making a "howling" noise on its lowest setting?
It is brand new and driving me crazy!!!
the fan is not rubbing on anything and it only does it on low

 

[mtandrews]

what does it do when you power it up outside the doghouse?

 

[dusterny]

Because it is new doesn't mean it's any good sorry to say. Take it out run it see if you got bad brg. or another issue.

 

[MVRCorp]

Dry bearing. It shouldn't do it if it's new but a few drops of good old 30W on both bearings will cure it.
Jim

 

[Done Swimmin]

Try hitting the shaft snub on the outside to drive the motor shaft (armature) in a fraction. The small change will allow the motor to spin in a slightly different spot on the bearings. It works to stop resonance (noise) that develops over time.
pete