Ive done a ton of these, replace the blowermotor resistor,it located near the blower motor in the heater box just unplug it remove two screws and out it comes, its on the pass/side toward the bottom, also take a look at the connector some of these durangos melt the connector if so replace the connector, thye connector is a dealer part heres a picture of the resistor, hope this helps.
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Ive done a ton of these, replace the blowermotor resistor,it located near the blower motor in the heater box just unplug it remove two screws and out it comes, its on the pass/side toward the bottom, also take a look at the connector some of these durangos melt the connector if so replace the connector, thye connector is a dealer part heres a picture of the resistor, hope this helps.