You need to replace the blower motor resistor. I've been there done that.
Your blower switch sensor is out. Replace it!Then all the speeds will work
Sounds like your dial/switch controal is shot or faulty. Try and replace that than see what happens. Just happened to me recently with the temp controal dial.
The high speed relay for the blower motor would be found under the hood, on the passenger side of the firewall, close to the blower motor speed resistor.
replace the switch.
Bad resistor at the blower motor? Bad blower motor switch?
either the blower control switch or the blower motoer needs replacing
There is a Blower Motor Resistor Pack. Either the blower motor speed control switch itself is defective or the Resistor Pack is bad.
if your blower is working on low and medium speed then it's not a fuse it is the blower switch
Could be,The blower speed switch or electrical plug at switch is burned out. The high speed blower relay is burned out. The blower motor is on its way out. The blower motor speed control resister is burned out, The cabin filter (if applicable) is very dirty.
switch contact"s
There is a replaceable resistor which is in the engine compartment located on the blower. It is usually fastened by two small screws. Remove the electrical connectors and get a replacement. If the resistor is burned out you will still have high speed. If you have the lower speeds but no high speed, replace the blower motor high speed relay. If you have no speeds at all I would suspect either the blower speed switch and its electrical plug is at fault or the blower motor itself is bad.
either the switch or the fan motor