80Q Moose in the Heater

[Chris Soult <cas@penn.com>]

Now that the weather has turned cold in the North-East, I want to use
the heater in my car.  When I turn the fan on, however, it sounds like
there is a sick moose bellowing in my dash.  It is loud enough that I
have to turn the radio up really loud to drowned out the sound.  The
pitch increases as I increase the speed of the fan.  Thank God for
heated seats, if I didn't have them I would have to drive around cold -
or I would be deaf from the radio. 

Has anyone else encountered this? Is there a quick fix for this? Can it
be fixed by lubricating the fan? Where is the fan?

TIA
Jeb Soult
Emma@Penn.com