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Old 09-30-2011, 09:01 PM   #1
rkl
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heater fan switch not working in low speed

On my 2005 Wrangler, the low speed fan setting does not work..Medium and high settings work fine...Could this be a bad relay and if so where is it located..or is it in the fan itself?...thanks for any info RKL

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Old 09-30-2011, 09:03 PM   #2
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Probably the heater resistor pack.

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Old 09-30-2011, 09:11 PM   #3
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it could be the switch, the resistor, or a fuse/relay.

mine actually just went out progressively over the last week or two.

switch is pretty cheap, resistor is between 20-50 bucks, fuse and relay are cheap. all of its pretty easy to get to and replace.

also you can apparently replace the whole panel of switches for the climate control, I havent read to much on that yet.
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Old 10-01-2011, 12:34 AM   #4
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Funny, I lost everything except high a few weeks ago. Been meaning to ask.
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Old 10-01-2011, 06:21 AM   #5
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I'm doing mine, (2000tj), today. Same problem. It's the resistor on not only Jeeps but on vehicles in general. The heater motors are made to run on 12 volts when on high, and on less to run on the other lower speeds.
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Old 10-02-2011, 06:59 AM   #6
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I renewed my resistor yesterday as I had planned, (napa part #257 for my 2000). I started by taking the glovebox door off which I didn't need to do, but it does let more light into the work area. You still can't see anything till you remove the thin black plastic cover from the assembly, (4- 8mm screws), and you'll see the resistor held in by 2 more 8mm's. Once removed from the air-flow you can better see to unplug it. Your old resistor could be cruddy looking because it's in the intake air-flow being cooled because it get's hot performing it's task .

If we imagine a day in the life of one of these resistor packs we can understand why they fail so easily. By the time we are arriving at a destination, the vehicle is comfy, the fan on low, the resistor assembly is at it's very hottest from it's job of converting volts into heat and dissipating it into the air and it is depending on the air flow passing by it to cool it off--and you shut the Jeep off. No more air flow. The temp of the resistor raises dramatically for a minute or two and I think I recognize a little capsule shaped heat-fuse sitting in there that is probably the cause of the failure. You'll see it too, it looks like a pill. They are cheap at Radio Shack and I'm going to replace mine and clean it up the assy with throttle body spray for future use. This is the same device that is in the nozzel of hair dryers so they won't melt. Do the resistor a favor by turning the fan off just BEFORE you arrive, (and run your hair dryer blower on cold for a few seconds).
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Old 10-03-2011, 03:01 AM   #7
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Quote:
Originally Posted by 00tj2 View Post
Funny, I lost everything except high a few weeks ago. Been meaning to ask.
if high is the only setting that works it is the blower motor resitor, when in the high position it by-passes the resistor, which is why it will only work in high


however for the origial post- if only the low setting doesnt work then it is more than likely the switch, you can replace the switch itself for around $30 or the entire panel for around $100-

switch-
http://www.jeep4x4center.com/switch-...5011214aa.html


panel-
http://www.jeep4x4center.com/control...5037473ab.html



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Old 10-03-2011, 03:48 PM   #8
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Mine all cut out, I got my high to come back on be taking it apart, cleaning the switch, and pushing in on the rod that runs from the switch back in. the other three dont work, so I think I still need the resistor. but it seems that my switch may be bad too?
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Old 02-11-2012, 11:59 AM   #9
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Can one of you guys maybe tell me how to even access this, get it out, replace, etc?
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Old 02-11-2012, 12:12 PM   #10
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Likely the resistor, as has been stated above. I lost the 2 lowest speeds on my '05, and that was the fix. This should get you close.



http://www.jeepforum.com/forum/f9/20...r-pics-520800/
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Old 02-11-2012, 01:13 PM   #11
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Quote:
Originally Posted by scgeek12 View Post
if high is the only setting that works it is the blower motor resitor, when in the high position it by-passes the resistor, which is why it will only work in high


however for the origial post- if only the low setting doesnt work then it is more than likely the switch, you can replace the switch itself for around $30 or the entire panel for around $100-

When my resistor started to go, I lost fan speeds one by one over time starting with the lowest speed. My neighbor's TJ did the same thing.
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Old 02-11-2012, 01:19 PM   #12
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When my resistor started to go, I lost fan speeds one by one over time starting with the lowest speed. My neighbor's TJ did the same thing.
Yeah, the pack has more than one resistor in it. What speeds don't work depends on which resistor blows. If the heater won't work on high, it's either the switch or motor. Anything below that, I'd look at the resistor pack first
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Old 05-25-2013, 12:27 PM   #13
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I had exactly this issue. Low speed would not worked. It was the resistor pack that fixed it.

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