97 rodeo heater/ac fan BUZZ/NOISE

my fan for my ac/heat buzzes like crazy. ive taken the fan out (located under passenger dash) and gave it power and it ran fine, silent, no noise at all! it buzzes so loud you cant run it at all.
also my hvac switches only works on high...on low, medium, there is no output at all!!!

any input will be appreciated.............and i LOVE my rodeo except for the fact that my neighbor ran into it on 09-02-2004 :( :(


!!!again thanks!!!

Sounds like some debris is rubbing against the blower/squirrel cage. It's common for leaves or paper to get in there. Feel around in the plenum if you take the blower out.
G/luck
Joel