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Old 08-25-2014, 10:25 PM   #1
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blower problems???

So, I realize this is a common problem, but here is my situation. 2000 jeep wrangler 4.0, ac fan not working on any speed. I have looked at and replaced the fan speed control knob, blower motor resistor, blower motor, and lastly the blower motor relay. None of the connections looked burned, a little dirty but not to bad. I have full power to the blower motor as soon as I turn the key on of grounded to body but no power using the negative in the plug for the fan. I tried bypassing the ground at the blower motor relay but still no luck. Should the relay be clicking or something, because not a peep from the new or old one. Someone blew up my volt meter so I can't check continuity till tomorrow :/ thinking it has to be some kind of loose wire on the ground side of the blower motor... Thoughts?

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Old 08-25-2014, 10:52 PM   #2
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You are missing how the circuit works. If you are getting power to the motor the relay is good. As soon as you turn the key on the relay closes (clicks on) & supplies power to the motor. The rest of the control, the 4 speeds & off are through the ground side of the circuit. When off, there is no ground through the circuit & the motor doesn’t run. When on, the ground is either a direct ground for high speed or reduced ground through the resistor pack to reduce the speeds. So yes, you are probably missing the ground in the circuit (but not related to the relay being grounded). Here is a link to completely troubleshoot the circuit. You can do it without a meter if you have a 12v test light.

Heater problems

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Old 08-27-2014, 02:29 AM   #3
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I got it! Thank you so much Rubi! It was a melted plug on the outside of the climate control knob, three wires on the passenger side (not sure the correct name). I cut it back and made my own plug. Thank you again for your post. I hadn't found that particular plug in any of the wiring diagrams I had looked at.
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Old 08-27-2014, 01:39 PM   #4
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It is called the mode selector switch & that connector is the most common failure point. It is the C-3 connector in the FSM diagrams but the wires are not shown together so you have to go around the A/C-heater control panel in the diagram to find all the wires for that connector (labeled A,B, & C). If you need FSM diagrams in the future, or any other repair help here is a link that will help.

See online read only FSMs here:
Jeep Information Center, Jeep Parts Catalog, Jeep Repair Manual & More
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.
Pick your model & year then on the drop down menu pick the chapter you need.

And welcome to the forum.
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blower motor , blower motor resistor , blower relay

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