Blower motor only goes on high but low and med dont work at all

If the motor blows on med-high but not high or low, it's the resistor.

you probably need new control switch.

Check the blower motor resistor.

The blower resistor has gone bad which is why you lost blower speeds.This may have been caused by the blower motor drawing too much power. At this point I would verify that no fuses burned out and then check the pigtail plugs going to the resistor and blower motor to make sure the connectors and connections are not melted or wiring is frayed. These connectors are located in the engine compartment on the passenger side. After checking this and if everything appears ok then the blower motor itself has probably gone bad and needs replaced. I would also replace the blower motor resistor as well. If the connectors appear damaged replace or repair as needed .

your switch is bad more than likely but different settings send power threw the motor different ways so if one way shorts out another sometimes still works also if you have had a different blower motor put in some only have one speed if you just buy the cheapest one

Try the controls

blower motor resistor is burnt out on those speeds

The problem usually stems with the blower motor resistor,high speed by-passes it and there-fore the controller is sending power but the resistor has gone open and the speeds can't be regulated.

Your blower resistor is bad. It controls the mutiple speeds to allow you to go from low/med/high. When it goes bad you get one speed or no speeds....It's about $20-$50 at any local auto parts store. It mounted directly to the speed switch or on the heater plenum unit on the passenger side behind the glove box....

its the blower motor resister not a relay.