The variable resistor control has had several of the "pathways" burnt out. It is a common problem in newer cars. The only way to fix it is to find a replacement and replace the variable resistor under the knob in the panel. Depending on how mechanically inclined you are, you may need to take it to a dealer for servicing.

The last answer is somewhat correct. most controls today are electronic and quite often one or more speeds will malfuntion. Most cars today have separate fuse for the high speed and the rest. check this first. the unit is not on the switch but usually mounted somewhere on the outside of the fan housing with the electronics protruding into the housing to keep it cool.

This variable resistor control on a Wrangler is very easy to install and should take a max of 15 minutes. But, I have a question regarding this switch. I have had this problem about 6 times now and not sure why the thing is burning out. Once you take the old switch out, you could see where it had melted in the connections. I am wondering if this is a recall call item. At first, Jeep would sell you the entire panel for $110, and I did notice with the last two switches, they are now selling just the switches for about 20 to 30. Any help from anyone out there?

With the TJ series Jeep Wranglers (1998-2006) this is a common problem. There are a few answers, starting with the easiest and least expensive. First, the wires (C1 and/or C205) on the heater control panel could (and probably are) loose or covered in gunk. Make sure these are secure and corrosion free first. If this doesn't fix it, then check the fuse in the glovebox that correlates with the heater blower resistor. The blower resistor limits the amount of electricity the heating system gives and thus limits the output of moving air. This is actually what you are changing when you switch from low, medium, high and max on the control panel. With newer vehicles (chysler/Jeep specifically) this resistor gets blown. Sometimes, however, the fuse is just blown, so check the fuse first. If the fuse is fine, then you most likely need a new blower resistor. This can be found at NAPA, Advance Auto, or a JEEP deal for $18-$23, although it may require being shipped. There are 2 screws under the dash itself on the passenger side and there may be one on top. Take these off with a 1/4" socket and add the new one on. That should fix your problem. Worst case scenario, the problem is the blower motor itself. These run about $120 and are more difficult to replace. That should be everything!

On the 2000 Wrangler, you can purchase only the switch from the dealer. Part number 1-05011214AA. It's about $20. If your fan only works in the high position, you need to do a couple things. 1) Check the blower motor resistor block underneath the glove box. Where you feet stick in the foot well, there is a black panel your right foot would hit. It has about 4 7mm screws holding it pointing up. Unscrew these. The resistor block has two screws and a small wiring harness to it, it's also grey. Remove this and look at it. Sometimes its rusted out visibly. Use a voltmeter to check continuity between the 4 input pins. If there isn't any in all positions, then it may be bad. Also, don't just replace this as you may break it again. Pull off the dash (like you would install a stereo). Unscrew the HVAC control knob unit. Look at the speed selection switch wiring harness. Usually, this will melt. That would cause a short and if so, you need to replace. You can also perform a continuity test on it with a voltmeter making sure each switch position works and the switch isn't melted and shorted on the inside. This is the fourth replacement for me (155k miles). I'm also considering what others have said about maybe replacing the blower motor because maybe it's drawing too much current. Oh, if the wiring harness to the speed selection switch melts, I think you will need to build your own connector. Chrysler wanted something like $150 for a new wiring harness for this. I did my connector by using Anderson Powerpole connectors (for the thick wires) and a trailer wiring harness for the other 3. I carefully soldered one side of the connector to the switch contacts (making sure not to melt the switch itself!). I then put electrical tape in a square around the connectors and adding in a bunch of 10 min epoxy, such the contacts wouldn't bump into each other or be impacted by water. Hopefully Chrysler fixes this. Its a major defect.

I have a 2000 wrangler and this has now happened twice I read in numerous other blogs that this panel constatly burns out if you have a short - I still have to find mine I bought a used panel off ebay and replaced the fan switch as it was melted - evidenlty caused by a short but cant find it - shortly after I was down to high fan only - now its gone - about 1 year - luckily I bought a spare panel - I was told that the newer - since 2000 jeeps require the whole wiring harness replaced just because of this switch - I am sure my office heard me yell - but its a jeep ! So try and find a wrecker with a panel and grab as many as you can - it looks to be a defect in the panel or the structure of the electrical system

i have a 2004 jeep wrangler sport and the fan only works in the high position. i bought a blower resister but i do not know where it is located. could you please tell me where it is located.