1996 Dodge Grand Caravan 3.8L. Heater/Air condition Blower motor works only on high speed shortly before it br?

1996 Dodge Grand Caravan 3.8L. Heater/Air condition Blower motor works only on high speed shortly before it broke I could smell the sent of a hot electrical component or wire; I have occasionally smelt this sent on and off for sometime, but a liter smell. 2years ago I replaced the blower motor with a new one from a Dodge dealer with no problems until now… I am 68 and in a position that I can’t afford to take it to a shop. I would deeply appreciate any info you can provide. Thank You; Tom