The blower resistor has failed. Located behind glove box door.
Where is the resistor on 2001 jeep wrangler
The blower resistor is behind the glove box door.
remove the battery and the cpu, the blower motor will be right under it.
In the fuse box
I had the same problem and I found it to be the blower motor resister. This is what controls the blower motor settings. You will have to find out where it is on yours.
Either your switch is messed up, or more likely the blower motor resistor is bad.
it needs a blower motor resistor to make the fan settings work.If you replace the Blower MOTOR Resistor it should resolve the problem.
In a 1997 Jeep Wrangler, the relay switch for the heater blower and motor is located behind the dash. It will be directly behind the HVAC knobs behind the dashboard.
Replace fan switch.
Go to Wholesalemopar.com and search for your wrangler, keyword "resistor". Two parts will come up, I believe they are the same, but one has a link to a schematic for blower assembly. Good Luck.
Defective blower motor resistor pack.