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sounds like a blower resistor. usually it is on the passenger side under dash near blower motor and hvac box. the resistor add resistance to the circuit to slow the blower motor, if it is inop then you only get high speed.
Check to see if you are getting voltage to the blower motor if you are the motor is bad if not check the fan speed switch. 1 2 3 or low medium high if you get voltage going to the switch but not from replace the switch if you have voltage from switch check the blower motor resistor the although with the blower resistor you commonly have a high fan speed in the max setting and the lower speed settings don't work wich would make you think 1 2 3 are not working but 4 is. That is why it is best to check all parts to make sure the part you do replace needed to be replaced
Problem with blower motor is the blower motor resistor. They are usually located next to the blower motor, a couple of screws and a couple of plugs and your done. Autozone sells them for around $30 each. Wipers you may want to check for relays under the hood in the fuse block. There may be 2 relays 1 for low and 1 for high. I have switched relays from other working accesories and got wipers to work. Sometimes bad connection.
the blower not working on settings 1-3 is the blower motor resistor. this limits the power provided to the blower motor itself to change the speed. at setting 4 it is getting full power. since it quit on 4 also, i would still say the resistor needs to be replaced first, then see if the blower comes back. you may also need a blower motor. if you have a voltmeter you can just turn the switch to 4 and see if the motor is still getting 12 volts. if it is and doesn't run, it needs a blower motor too. if it's not, then its just the resistor
The fan motor has gone out,it was bad before it went out,drawing too many amps,so it took the blower motor resister out with it.The resister is next to the blower motor.On the speedo,check,or replace the speed sensor in the transmission,
Usually when the blower only works on the higher speeds, the blower motor resistor has gone bad. This should be located somewhere near the blower motor itself, it is usually bolted to the blower motor housing (or in that area), just unbolt it and you can replace it. Hope this helps