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Old 09-21-2013, 03:14 PM   #1
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Heater/AC control ?

So my 04 Rubicon decided that the fan setting one and two don't want to work. I have checked all of my fuses behind the glove box and under the hood. Can anyone please help me with this. Also setting 3 and 4 work.

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Old 09-21-2013, 03:59 PM   #2
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I have seen several posts on this stating that the resistor is the culprit.

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Old 09-21-2013, 04:02 PM   #3
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If 3 and 4 are working it isn't a fuse if it was a fuse you would get nothing. My guess would be the switch. How handy are you? The hvac control are real easy to take out and I'm sure a replacement part would be fairly cheap. Other places to look woukd be resistor and blower motor. However I always start at easiest cheapest way first and I would give it a 85 percent chance it's just the switch
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Old 09-21-2013, 07:03 PM   #4
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Almost always the resistor pack with that symptom. It was on mine. You could pull the switch panel and check for melted/burned contacts first.
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Old 09-21-2013, 07:03 PM   #5
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My bet is on your switch melting and 3 and 4 haven't melted yet. Pull the switch and look at it. It's common by the way. I'm on number three. You would think a obvious flaw that can fog your windows up should be a safety recall but f no.

Edit. I've never seen the resistor as the culprit unless only high (4) works. You got 3 so switch is still my best guess. The resistor plug can melt too but is far less common.
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Old 09-21-2013, 08:09 PM   #6
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Sweet, thanks I'll tear into it tomorrow when the weather clears up.
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Old 09-22-2013, 06:33 AM   #7
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Quote:
Originally Posted by Majnoon View Post
My bet is on your switch melting and 3 and 4 haven't melted yet. Pull the switch and look at it. It's common by the way. I'm on number three. You would think a obvious flaw that can fog your windows up should be a safety recall but f no.

Edit. I've never seen the resistor as the culprit unless only high (4) works. You got 3 so switch is still my best guess. The resistor plug can melt too but is far less common.
It depends on which resistor in the pack blows. Actually, if only high works, it's just as likely to be the switch. High does not use the resistors, all other speeds do. On mine, the first 2 wouldn't work and the rest did. It was the resistor pack. Still, it could be either one. Checking the switch is easy enough to eliminate that pretty quick before spending any money though.
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Old 09-24-2013, 03:26 PM   #8
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Well I tore it all apart and it looks like it is the switch itself
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Old 09-24-2013, 03:57 PM   #9
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If switch is bad can just replace or can replace and add relays so that the switch no longer has full amps running thru it so the contacts in the switch don't keep failing

I think JP mag had a how to on this
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Old 09-24-2013, 08:24 PM   #10
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My switch was melted too. Replaced it with one from rockauto. I ordered the blower motor from them too, but it was Chinese junk so I had the dealer get me one. From what I understand of the issue the relay mod is also a band aid that just sends the current and heat (the problem) somewhere else. The main issue seems to be the increased amperage as the blower motor gets old and worn. This of course is all just what I've gleaned from reading, I won't be able to prove my method until the problem arises again, which I'm banking on it not doing so...
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Old 09-25-2013, 09:15 AM   #11
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Would this also be the same fix for a 97 TJ where my vents aren't activating properly? I get no air out of my center main vents.

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