hi there. it probably means the shaft that drives the fan is slipping. and it only grips the fan when it is turning at a lower speed. hope that helps..... no sorry. i mean the belt that drives the fan might be slipping.
You need to replace blower motor resistor.
Blower resistor pack broken?
you have a bare wire touching on your blower motor
The blower motor resistor pack is defective. Replace it.
The blower motor resistor is bad.
If you are saying that the blower motor only works on the high speed setting, then the Blower Motor Resistor is defective and needs replacing.
There is a Blower Motor resistor that is located at the bottom back of the heater box on the passenger side cab. The blower motor plugs into it so that will help locate it. If the resistor goes you lose the lowest fan setting first and eventually the high fan setting will cease to function. Simple to repair just a little time consuming to do because of the limited space to work in. You need to remove the blower motor to properly access and remove the Blower motor resistor.
Check the fuse box. The front and rear blower motors are probably on different fuses.
The Blower Motor Resistor Pack is defective. Follow the wires from the Blower Motor to find it.
I have been told that when the fan blower only works in the last setting, it is usually the result of a bad fan resistor. I ran across this question trying to find where the location of that resistor is. The Haynes Repair Manual for the Dodge Spirit does not show the location...
It is the blower motor resister that shorted open. it is retangular in shape and is usually by the blower motor behind the glove box. It have two or sometimes 3 bolts holding in it.
If you are referring to the blower motor speed, and only the highest setting works, then the problem is a bad Blower Motor Resistor Pack.