[kennykenny]

I have a 2003 Taurus SE sedan. When I turn on the interior fan, you barely get any air come out of the vents until the fan is on the highest(fastest) setting and there is a "grinding" noise. Any ideas as to what the problem might be? Thank you.

 

[Windows on Wash]

Sound like the blower motor is shot. If its not working under low speed, could be a motor failure (bearings, etc.) that are keeping it from spinning freely at the lower power.

 

[chandler48]

I have had the experience of having dehydrated mouse carcasses in the motor causing it to run out of balance. You'll know better once you pull the motor.

 

[kennykenny]

Sound like the blower motor is shot. If its not working under low speed, could be a motor failure (bearings, etc.) that are keeping it from spinning freely at the lower power.

I'm assuming that it is not the resistor? Or would the fan not run at all?

 

[Windows on Wash]

It would not run a a given speed (slow - medium - high) if the resistor is burnt out.

 

[DexterII]

Actually, any I have had to mess with anyway, I'm pretty sure they will work on high because that's the "normal" position if you will, essentially full voltage. The resistor just cuts the voltage down for the low and medium settings. So you could have two problems, the grinding as well as a bad resistor, but I would find and correct the grinding first because that's probably putting enough external drag on things to prevent it from running at the reduced voltage on the lower settings.