I have searched all over the net. No kind of air blows in my 2000 sport. I changed both the fan control switch and the one with all the vacuum hoses. The connector going to the vacuum one was melted so I bought the new end and spliced it in. Still nothing. Pulled the resistor just now and its a little dusty but nothing looks melted or anything. Can't see that any other wires look melted etc. Checked 10amp fuse under dash and its good as well. Any suggestions?
FWIW got mine for about $130 from O'Reilley a couple years ago...easy replacement use a mirror and flashlight there is a write up on here how to do it...or google it.....maybe easier to test it outside of the Jeep one hot wire one ground?
My '04 is doing the same thing. no airflow on any setting. I've checked the inside and outside HVAC fuses (swapped them with known good ones), replaced the resistor, and replaced the blower control switch. As a result of the last bit the right side LED on the panel is now flickering and there's still no air flow inside the vehicle. engine temp is normal (right in the middle). what should I check next?
Mine started just blowing on high this week, I suspected the resistor but was wanting someone to give info on troubleshooting rather than just throwing a part at it. I might pull the switch out and take a look at it and maybe apply some contact cleaner if it looks like I can get some inside it.
2000 Wrangler Sport
what I've read about the resistor, you've got the symptoms. after replacing it, I read more into it and usually if one or more but not all your fan levels work it is the resistor. mine was obviously bad (there was a bulge and separation of the seal around the circuit board. after I pulled it out and replaced it, I had a better look and saw corrosion under that little bulge. 2 screws in very awkward places are all that holds it in though. if your jeep has a light on the floorboard you will need to remove that as well (1 more screw) and there is a big green cable right over top of one screw. you don't have to but can disconnect that for more room to work. there is a pretty good video online that will walk you through.
apparently my resistor needed replacing but it wasn't the reason I entirely lost all fan output. neither was the speed control switch. my wife bought me nice aluminum fan control knobs a while back when the OEM plastic ones stripped out.
Pull the two wire connector on the blower motor and connect a test light across the two terminals on the conector turn everything on and see if you have power there. Also look closely at the the connector and terminals in it to see if their loose or discolored from overheating, same thing with the two terminals in the blower fan. If you have power at the connector and all the terminla are tight and clean you'll need a blower motor.
That is not the proper way to test the motor. If the ground wire in the connector is not grounded, the test light will not light & you will think there is no power to the motor. The speed is controlled from the ground side & most of the time it seems like the ground path is open at the mode switch (one with a 3 wire connector & the vacuum hoses to it). Either a bad connection or a bad switch. Check that 3 wire connector for melting or signs of overheating like discoloration of the terminals. Then make a jumper with something like a paper clip & remove that connector & jump between the terminals of the 2 heavier gauge wires (black & dark blue) & turn the key on. The fan should come on. Try all 4 fan speeds. If they all work & the connector is good then the mode switch is bad.