The blower is either off, or full blast. I've replaced the resistor twice, once from the dealer and once somewhere else. The first time it seemed to last about a week. The second time just a day or so. Once installed all the intermediate fan speeds work fine. Then, nothing. Either off or high speed.
The heater/AC fan motor resistor fails on 2000 Plymouth Breeze
too much draw from the blower motor. replace the motor and resistor together.