Could be two problems. A bad bearing in the motor and the resistor is open. The resistor is in the airstream in the blower case and the motor if not on the firewall should be under the passenger side dash. I will check on that.
Additionally, it could be your serpentine belt squealing due to excessive current draw from a bad heater motor. Make sure it's the blower.
Your blower speed resistor could be burned out for the lower speeds do to excessive current draw from a bad blower.
Blower motor is bad. Resistor controls speed. Motor is so worn out that it will only turn when set on high. Best to replace it before it burns out something else due to the high current draw.
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