Welcome to Just Answer Chrysler my name is Mark.
Most likely you have an overheated connection for the blower motor resistor. I've seen this a couple of times on these and that would explain why it works sometimes and not others. The resistor can be located under the dash on the passenger side.
The resistor, is it simply a unplug old and plug in the new? Is it located behind the glove box? How do I get to it? is the proper name for the part the blower motor resistor?
Thank you you have been very helpful
Once you access the resistor, it is just a simple change out. You have to work from under the dash and remove a door from the bottom of the heater box. The are 2 slide catches that slide to the side in order to remove this door.
Once you swing the door down out of the way the resistor is right there held in with just 2 screws.
Yes, it's called a blower motor resistor.