AC/Heater fan has four speeds. The first 3 quit working but the 4th (high) still works. Any solutions?
Sounds like your blower motor needs to be replaced.
You actually have a problem with your blower resistor block. The speeds are controlled by resistance to the motor. When the resistor block goes, this type of situation will present itself. This is about a 1-hour job at a dealership, and the part is in the $30 range.
Littlehorn is at least partially correct. Replace the resistor, but if the resistor blows quickly (within a couple years I would say) check on the blower motor.
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