Fan Blower motor vibration

Hi there. I just bought a used 2004 Venture. The fan blower motor works fine at all speeds, but it causes noticeable vibration. You can actually feel it in the steering wheel and the vibration increases in intensity as the fan speed is increased.

Has anyone encountered this? I'm thinking that either the motor bearings are going or the fan may be bent or something.

I'll be buying a manual today, but thought I'd see if anyone had any experience with this.

Thanks,

Paul

Sounds like debris in the squirrel cage. My Lumina had the same symtoms and I found leaves and whirly birds.