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It's probably the blower motor resistor. It can overheat and burn out, often melting the connector so the connector cannot be separated. See the linked YouTube video for information on replacing the resistor, and connector if necessary. Dodge Dakota Durango Blower Motor Resistor Replacement
The blower motor resistor is bad ! The blower motor operates at different speeds an when you turn the speed switch It directs current through a different resistor making the blower motor go slower of faster . What Does Blower Motor Resistor Do eHow
The resistor bank is bad for slow speeds, the switch is bad for high speed. In your test, you have voltage, but the switch wont carry the amps, to run high speed. Open circuits will not blow fuses. Replace both switch and resistor bank for all speeds. Make sure to clean leaves and trash from fan housing and see if fan spins freely.
First Check the Front Blower Relay located in the IPM Fuses and Relay box in the Engine Compartment. There should be individual Front and Rear Blower Relays. The Identification and Location should be on the rear of the IPM Cover. If not check your Owner's Manual.
Switch these two Relays and recheck operation of the Front and Rear Blowers again. If the Front now works and the Rear does not, then the Relay was bad and needs to be replaced.
However the most common problems I have found is that the Front Blower only works on High. Is that the Case? Check it to be sure. If it only works on High then it is 100% the Resistor that is bad and needs to be replaced. The Front Blower Motor Resistor fail in these more often that the Blower Motor itself.
Remove the Dash Glove Box out of the Dash to gain access to the Resistor.
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Replace your blower motor resistor Resistor located under dash on passenger side in screwed into blower housing. May be able to be repaired. Requires soldering a small piece of "unmelted solder" across where the old fusible link was. look carefully at resistor. Or else just replace. Buy new. Junkyard resistor likely to be as bad as yours.
Your blower moter is under your glovebox and very easy to replace.I dont think thats your ploblem.I would pull off the dash.It will snap right off without breaking anything.Then pull out the part that holds the selector switch for the fan speed.Then you unplug that switch.Clean the copper contacts.Plug it back in.If everything works again like it should and did in my truck then it is either that switch that is bad or the wiring harness.I would replace that switch.