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If not the switch, you need to check vacuum lines near the firewall inside the engine compartment and under the dash. Just in case. I had problems with mine blowing only through the defrost because of a broke vacuum line. Good luck
Do the blower speed settings still work, just weaker? Or is it just one low speed all the time? If you can still change the speeds then it's a weak blower motor. If its just one low speed all the time, (same speed for high and low blower speed settings) then you need a blower motor resistor.
On your vehicle, if it works on low speed, that eliminates the fuse, the blower motor relay and the blower motor resistor. All of the parts of the resistor must bee good for it to work on low. The relay supplies power to the motor and the controls provide the ground, so if the motor runs at all, it is not the relay or the fuse. The only thing left is the switch. Fords are bad about burning the wire connector that conects to the switch. You will most likely have to replace the switch and the connector. Both of these parts are widely avaiable at most aftermarket parts stores.
If it was the motor that went out then it would not blow at all. The resistor is the culprit that starts killing off speeds. It should be about $25 to $30 at an aftermarket store like autozone or advanced auto parts.
need new technician.if the blower motor works even with only one speed than the blower motor works and did not need replacement.sounds like blower motor resistor or resistor wiring,when there is a problem with the resistor or wiring you will only have one speed,this way you atleast have heat.so if your tech replaced the blower motor when it worked and did not need replacement then it sounds like he is just throwing parts at it,you have to wonder if he really checked anything.have the resistor and wiring checked and if ok then check the heater control head and wiring.