bad switch or bad blower motor. i would go with the switch first as it is easier to access and cheaper. u can hotwire it and see if u can get the lower speeds. then go junkyard and get new switch
Blower motor relay is also somthing that will cause what you describe. Get a new one. You get junk from a junk yard.
The Blower Motor Resistor Pack is defective. Replace it. It is located on the passenger side by the blower motor. Very easy fix, 1 clip and 2 screws. Check RockAuto.com AIRTEX Part # 3A1287 for price and a great picture so you know what you are looking for. I just replace one today. It took about 10 minutes. I have seen the same problem on a number of vehicles.
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