There is a fuse under the hood for the blower motor.
Bad bearing in blower motor?
under the glove compartment I was told!
It should be in the heater blower motor case which is located under the glovebox.
the thermostat needs to be replaced
It is over the passenger side strut tower, accessible from under the hood.
NoNo
There are similar, but not the same.
The resistor block or blower motor resistor is used to control the speed of the blower motor. That is how you get the lower speeds on your air conditioning or heater. The higher the resistance the lower the speed of the motor.
Usually if the resistor is bad the heater will only run on full blast.
The Dodge Caravan heater was invented in 1984 by the Dodge and Mopar companies. Since it's creation it has evolved into a much bigger and popular van.
Probably the blower motor resistor is fried. New ones from Dodge dealer are usually about $20 for the part. A very cheap and easy DIY fix.