I can't tell from the audio. It makes the sound I heard one time in my
90 when a leaf had blown up in there and was squealing like a reed
instrument. I fixed it by taking it to highway speed and turning the
heater motor on and off until they worked the leaf out of the flaps
where it must have been stuck.

But, I hate to tell you, the fact that the sound starts immediately
when you switch the fan on--no lag time for pressure to build--tells
me that the motor is going out, a sound I have dealt with more than
once.

My magic 8-ball sees this in your near future:

1. More squealing.
2. Smoke
3. Buy a new motor, pull the dash and fix the rotten foam flaps in
your heater box over a weekend.

Hope it's just a leaf stuck in there.

Jim

On Tue, Feb 16, 2010 at 9:06 AM, Paul Guzyk <paullist08@guzyk.com> wrote:
> is this the motor going? � or a plenum problem? �sound doesn't change much if I move heater levers.
>
> http://www.youtube.com/watch?v=iE4Ex_X3mqA
>