The blower motor resistor controls the amount of electricity that flows through it. The amount of electricity that gets to the blower motor determines the motor's power and makes it possible to switch the air conditioner between high and low settings. Unfortunately, the resistor can run into many different problems like getting your aircon stuck on high setting, burning out frequently, and many others. Fortunately, if you know what is causing the problem and if you know how to fix it, you won't have much of a problem. For more information regarding common problems with the Dodge Durango blower motor resistor, continue reading.
A malfunctioning blower motor resistor is evident when the air conditioner starts blowing air at maximum power no matter what you do to the A/C control unit. This could mean that the blower motor resistor is burned out. The only possible fix to this situation is to have the resistor replaced with a new one. If you still can't adjust the air speed even after replacing the blower motor resistor, then the A/C control unit might be the one having trouble.
It is normal to have the blower motor resistor replaced from time to time, but if you find yourself needing to replace the thing every other week or so, then you've got a problem. If you've installed the blower motor yourself, be sure that you've done so correctly. The resistor is usually placed in the path of the blower motor's airway. This allows the resistor to be cooled down by the moving air to avoid overheating.
The wire harness could also be the culprit. Check out the wire harness connected to the blower motor resistor. Check for broken wires and make sure that none of them have their metal core exposed; this could cause short circuiting and may have led the blower motor resistor to burn out. Fix or replace the wires to solve the issue.
A malfunctioning blower motor could also cause the resistor to burn out. This happens when the blower motor pulls in too much electricity, overloading the coils and circuits of the resistor. Try cleaning the blower motor to remove any dirt that may be messing with the electrical contacts, but if that fails to fix the problem, replace the whole thing instead.