The following can cause this problem.................. 1. Bad blower motor. 2. Bad blower motor wheel. 3. Trash in the blower housing...
They get noisy, squeal and vibrate. Also if you keep burning out the blower motor resistor, that is a sign the blower motor is on its way out.
Your ac/heater blower motor may be going out, located below the glove box compartment.See "Related Questions" below for more about this easy do-it-yourself repair.
Behind the glove box inside the car. Small space to work but takes about 1/2 hour to replace. It's an easy do-it-yourself for about $50. Auto repair shops will charge $150-$300.
its the motor
Dust from drywall cutting for example is fine enough to get into the blower fan motor and cause a squeaking noise. You'll need to replace the fan if this is the case.
Ceiling fan motor is squeaking
-yes-if it work on hi only, check blower resistor-did you check the fuses-hit the blower with a hammer and see it that gets it going. if so, replace-has the blower been noisy lately? if so, replace-what kind of car is this? edsel? corvair? skyline?
Seafoam Motor Treatment.
remove the motor, some times its a buildup of leaves or debris stuck in the (squirrel cage fan blade) if no debris motor is old and bearing is worn you can run the blower while it it out of heater box but hold on with 2 hands and have someone turn switch you dont want to break plastic fan blade cage by bumping into dashboard at 600 rpm
You didn't say what type of motor. If an electric motor it could be the shaft bearing(s) are worn.
Why would pool pump motor be very nosiy all of a sudden