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This is 100% the Blower (Fan) Motor Resistor located near the Blower Motor. This is a very common problem with Chyrsler, Dodge, Jeep and Plymouth. The key symptom is the Fan only working on High. This is very easy to access and replace.
Yes I would go with the switch, BUT, does it have a resistor bank? That is, how does it reduce the speed? Many systems use resistors to lower the speed. Burnt or bad connections can cause this as well.
You can test the blower motor by connecting direct power from a source like the cigarette lighter if you are handy.
Most of the time the lower speeds konk out but the high speed continues to work this is the resistor bank that goes out.
You have to change the resistor, it's located in the blower housing under the dash. It looks like a plug with 2 or 3 little screws holding it in, it has different lengths of wire inside it that creates your different speeds
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