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High fan speed speed inop, the other three speeds ok and max AC boost works for the fan speeds that work. Has the rotory swich failed or is this the resistor block failed? By the wire diagram can't tell if this is all the same *** or if the resistor block seperate *** part of the rotory switch?  

sounds like a bad blower motor resistor.  should be a seperate peice but im not sure on your car.  

I just bought a 2001 TJ.  The fan switch was the problem.  Unfortunately, the switch is only sold with the panel of 3 controls.  It cost me about $80.00.  Everything was fine for about 3 weeks.  The replacement broke too!  I don't know if the fan is causing the switch to overheat or what.  My symptom is you must put the switch between the speeds to get anything to work.  It's like the switch got too hot and came apart inside.  I have 2 settings now, off and high.  The dealership said they'd replace the defective switch for free.  

I have replaced the fan switch on mine 3 times, it is the fault of the switch itself, it is underated for the current that the motor draws.  You must also be sure that the plug on the switch has good connections, this may require cutting the wires and installing new push on connections and this time SOLDER them to the wires.  If these connections get cruddy from overheting, they will cause resistance and the connection will get hotter and melt the plastic inside the switch.  You should be able to buy that fan speed switch separately, mine cost about$15.00 at the local dealer. Hope this helps...........TLC  

It could be the blower module. It is located behind the Glove Box. The wire from blower motor is connected directly to this module that has a defect of over heating the main power connection to this board. If you remove the Module and take apart you can see the burnt connection which causes a high resistance. You can get a replacement Kit from dealer to fix the wire terminal.  

How do I find this piece you are talking about? I have removed the glove box and everything else. I replaced the switches and the wireing to the switches last yr. Now this is my last hope. I need to fix this problem once and for all.

Thanks