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Old 07-31-2012, 06:17 AM   #91
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From page 363 of the 2012 owners manual:
For this reason, the system will not allow
recirculation to be selected while in floor, defrost, or
defrost/floor mode. Attempting to use recirculation
while in these modes will cause the LED in the control
button to blink and then turn off.

When using recircualtion in the other modes, once its been on for 10 minutes, it will automatically shut off and go back to fresh air. But this should not make the blower fans top working. It seems the dealer tech doesn't understand how the system works.
4

whWhile using recircualtion in the vent mode,


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Old 07-31-2012, 11:03 AM   #92
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Quote:
Originally Posted by SilverSport View Post
From page 363 of the 2012 owners manual:
For this reason, the system will not allow
recirculation to be selected while in floor, defrost, or
defrost/floor mode. Attempting to use recirculation
while in these modes will cause the LED in the control
button to blink and then turn off.

When using recircualtion in the other modes, once its been on for 10 minutes, it will automatically shut off and go back to fresh air. But this should not make the blower fans top working. It seems the dealer tech doesn't understand how the system works.
4

whWhile using recircualtion in the vent mode,

I agree the fan should not shut off unless they programmed it to slow down during the switch over.

Why would the engineers cancel recirculation mode after 10 minutes on a vehicle that can be driven with windshield down, top & doors off? Even with a hard top, it is not hermetically sealed. Is this another federal regulation or result of a lawsuit?

Now I will have to see if the recirculation mode shuts off. I have left it on quite a bit this summer and have not noticed it reverting back to outside air mode. Does the recirc LED shut off when it switches?

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Old 08-01-2012, 08:33 AM   #93
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I have never noticed it switching from recirc to fresh air after 10 minutes either, but I haven't really paid attention. Just sharing what the OM states its supposed to do.
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Old 08-01-2012, 09:02 AM   #94
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Sorry I was not attacking your post. The information is greatly appreciated. I was just "venting", pun intended. I tend to bristle when I lose freedom of choice from government mandates to AC choices in my Jeep.

Has anyone gotten a dealer to even acknowledge the issue?
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Old 08-02-2012, 01:19 PM   #95
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I took mine into the dealer Monday and they said they don't know what I am talking about because they couldn't make it do it and they haven't had any complaints. They also said they are not interested in hearing what forums have to say.
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Old 08-02-2012, 01:52 PM   #96
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Time to find a new dealer. ^^
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Old 08-02-2012, 03:13 PM   #97
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I've had that happen to me a few times - 2012 JKU Sahara - coming up on 3k miles.

Nothing like that "OH S#!?" feeling when your blower cuts out on a 105 degree day.

It gets my attention when it suddenly goes silent... as last year I grappled with the melting climate control connectors on my 99' TJ Sahara.

At least I don't have to reach through the glove box to jiggle the wires to make it work again

I haven't paid attention to the specific conditions/settings for when it cuts out, but I'll try to take notice next time it happens.
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Old 08-02-2012, 09:28 PM   #98
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Quote:
Originally Posted by Jeeperz Creeperz View Post
Sorry I was not attacking your post. The information is greatly appreciated. I was just "venting", pun intended. I tend to bristle when I lose freedom of choice from government mandates to AC choices in my Jeep.

Has anyone gotten a dealer to even acknowledge the issue?
The dealer acknowledges the issue. The shop foreman was trying to determine a cause before he went on vacation.
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Old 08-07-2012, 12:41 AM   #99
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My 2012 Rubi/2dr just started doing this....she has 500 miles on her.

Please keep us posted, I will do the same if it continues.
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Old 08-07-2012, 10:08 AM   #100
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Fan Problems

I too have experienced the blower problem.. ALWAYS happens within 5 to 10 minutes of start up... and I'm leaning more towards before the 5 minute mark. The blower has always been on high. No particular speed or acceleration when it happens. There is also a delay in changing from vents, like from forward facing to defrost or defrost to floor etc sometimes for 3 to 5 seconds. Also a delay if the blower switch is on high when the vehicle is started, same 3 to 5 seconds, before the fan actually starts blowing. And there is also an annoying delay in the horn, it's more like a second delay from the time you push the horn until the horn blows. All of this sounds like a software problem to me..
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Old 08-07-2012, 10:12 AM   #101
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To solve the issue we need to list the conditions of the event. List clearly you conditions of the event. I will try to compile the information.
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Old 08-07-2012, 03:01 PM   #102
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I have had this happen once so far on my 12 Rubicon. I was extremely low on fuel at the time and I figured it went out because it was trying to cut back on fuel consumption.
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Old 08-07-2012, 03:17 PM   #103
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I'm from Chicago and I've been dealing with endless 90+ degree days with intense humidity. If I hadn't gotten a/c in my 2012 I probably would have gotten it installed aftermarket. Anyone saying that the a/c isn't 'worth it' is either mad they didn't get it or doesn't use their Jeep as a daily driver.
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Old 08-07-2012, 03:44 PM   #104
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No fan cut out on mine so far. Also no reverting to fresh air intake mode.

I have left the AC on in recirculation mode in the position where air comes through the dash and floor vents at the same time. It hasn't changed in 5 or 6 drives, some over 10 minutes. I do change the fan speed based on need but nothing else. It is a manual choice AC. I only have a bit over 1,100 miles on the Wrangler.
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Old 08-17-2012, 09:17 PM   #105
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Update:

Dropped the Jeep off at the dealer this morning so the shop foreman could have it for a day. After discussing the problem with Chrysler engineering, they wanted him to check all the grounds and connectors for the HVAC system. When I called at 3 PM for an update, he hadn't found any loose or bad grounds and nothing out of the ordinary when he checked the pins and sockets in the connectors. Said he would need to have the Jeep for a few days so he could leave the WiTech tool hooked up.
That way when it acted up, he would be able to determine if the problem was on the power or ground side.

Anyway, when I got back to the dealer, he told me he had started the Jeep to move it. Fan on high, AC on, fresh air mode, and set to vent. All by itself, the system switched to blowing air out the defroster. After a time, it went back to vent. He then re-mapped the HVAC system module (uses the WiTech to "tell the doors where they stop and the associated voltage signal). I asked if he had any idea why it happened. He said the mode door and fresh air/recirculate doors self calibrate everytime the Jeep is started by going from one mode to another and back. This is why there is a delay upon startup, the self test is taking place.

Also lets the HVAC controls "know" what position the doors are in. Also told me if the battery goes bad or battery cables are unhooked, it MAY cause the system to lose its calibration. So what happened today was the mode door was "lost" so it went all the way to defrost which is one stop and then all the way back to vent.

If the blower motor appears to shutoff again, he asked me to check to see if air is coming out of the defroster. What appears to be the blower shutting off might be the mode door sending air elsewhere.
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Old 08-17-2012, 09:51 PM   #106
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I've had this happen twice. It's almost certainly a software issue, it's obviously pretty common. I had it kick the air to defrost mode once also. When the blower motor cuts out, it's just completely shutting off, no mode change. The sudden fan stop grabs your attention.
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Old 08-18-2012, 01:52 AM   #107
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My experience with getting A/C cuts is that more is affected.

Whenever this has happened to me, the blinkers, radio and A/C all cut out.
It seems to reset itself but on occasion can happen continuously. When it gets out of control i just slip my jeep into neutral and turn off the engine for 5 seconds and turn it back on and all is ok.

Originally i thought this was happening due to a bad ground on my remote start. This can be possible if you have installed something recently but i am unsure.

Best of luck.
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Old 08-18-2012, 11:34 AM   #108
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Quote:
Originally Posted by SilverSport View Post
Update:

Dropped the Jeep off at the dealer this morning so the shop foreman could have it for a day. After discussing the problem with Chrysler engineering, they wanted him to check all the grounds and connectors for the HVAC system. When I called at 3 PM for an update, he hadn't found any loose or bad grounds and nothing out of the ordinary when he checked the pins and sockets in the connectors. Said he would need to have the Jeep for a few days so he could leave the WiTech tool hooked up.
That way when it acted up, he would be able to determine if the problem was on the power or ground side.

Anyway, when I got back to the dealer, he told me he had started the Jeep to move it. Fan on high, AC on, fresh air mode, and set to vent. All by itself, the system switched to blowing air out the defroster. After a time, it went back to vent. He then re-mapped the HVAC system module (uses the WiTech to "tell the doors where they stop and the associated voltage signal). I asked if he had any idea why it happened. He said the mode door and fresh air/recirculate doors self calibrate everytime the Jeep is started by going from one mode to another and back. This is why there is a delay upon startup, the self test is taking place.

Also lets the HVAC controls "know" what position the doors are in. Also told me if the battery goes bad or battery cables are unhooked, it MAY cause the system to lose its calibration. So what happened today was the mode door was "lost" so it went all the way to defrost which is one stop and then all the way back to vent.

If the blower motor appears to shutoff again, he asked me to check to see if air is coming out of the defroster. What appears to be the blower shutting off might be the mode door sending air elsewhere.
What your dealer tech said makes a lot of sense. FMVSS 103 requires that the climate control system be fail safe in defrost mode. That's because defrost is the federal requirement. That's also why the system won't go into recirc in defrost of floor, because the system will be moving humid interior air up onto the windshield, causing interior fogging. The FMVSS regs are the same for all motor vehicles and don't distinguish between sedans, convertibles, or Jeeps. I'm also glad to hear they were suspicious of a loose terminal as well as i was.
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Old 08-18-2012, 11:47 AM   #109
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Quote:
Originally Posted by stans1stjeep View Post
What your dealer tech said makes a lot of sense. FMVSS 103 requires that the climate control system be fail safe in defrost mode. That's because defrost is the federal requirement. That's also why the system won't go into recirc in defrost of floor, because the system will be moving humid interior air up onto the windshield, causing interior fogging. The FMVSS regs are the same for all motor vehicles and don't distinguish between sedans, convertibles, or Jeeps. I'm also glad to hear they were suspicious of a loose terminal as well as i was.
Learn something new everyday!

The shop foreman at the dealer is in his 60s and has been wrenching for years. He was willing to try to find the cause and fix even before the system acted up on him.
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Old 08-18-2012, 01:50 PM   #110
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Add another one! Mine shut off a couple of weeks ago for about 3 seconds. It was during our 110 degree stretch so it got my attention real quick. I had only driven about 2 minutes when it happend. I only have 4k miles now, so i would guess i had about 3k miles then? I know 4k miles in 6 weeks!! eeek!
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Old 08-20-2012, 08:25 PM   #111
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My 2013 has done this 3 times now. 400 miles on it. I assumed it was a harmless software issue, but was wondering if anyone has any updates?
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Old 08-20-2012, 09:50 PM   #112
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This has been happening to me with less than 1000 miles, shuts off randomly for about 3 seconds, about once every other day.

To be honest I only consider it a minor annoyance and not worth getting upset or even bothering to take it to the dealer.

With that said as an EE I find this interesting to experience and to read about here, and I have a theory.

It's an undocumented feature, and I'm serious. I think the pause on startup is the system self testing. The semingly random stops are a combination of things, the AC and venting settings combination, and a set of temp/humidity sensors. I've noticed even in the heat I can get condensation buildup on the windshield if I try. When this happens I've noticed the "random" shutoff and AC system reset will happen. Sometimes the recirculation indicator will change state.

So my guess is it's 100% software and was put there on purpose, although it may not function as intended.

We'll have to wait for JKSW version 1.1.0.
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Old 08-21-2012, 01:06 AM   #113
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I now have this issue in my '12. it's happened about 4 times and is completely random. idle, 1st gear rolling, 3rd gear hill climb full throttle, 6th gear cruise.

what's next.
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Old 08-21-2012, 08:31 AM   #114
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Quote:
Originally Posted by SilverSport View Post
Update:
----
Anyway, when I got back to the dealer, he told me he had started the Jeep to move it. Fan on high, AC on, fresh air mode, and set to vent. All by itself, the system switched to blowing air out the defroster. After a time, it went back to vent. He then re-mapped the HVAC system module (uses the WiTech to "tell the doors where they stop and the associated voltage signal). I asked if he had any idea why it happened. He said the mode door and fresh air/recirculate doors self calibrate everytime the Jeep is started by going from one mode to another and back. This is why there is a delay upon startup, the self test is taking place.

Also lets the HVAC controls "know" what position the doors are in. Also told me if the battery goes bad or battery cables are unhooked, it MAY cause the system to lose its calibration. So what happened today was the mode door was "lost" so it went all the way to defrost which is one stop and then all the way back to vent.

If the blower motor appears to shutoff again, he asked me to check to see if air is coming out of the defroster. What appears to be the blower shutting off might be the mode door sending air elsewhere.
-----

I work in the HVAC Direct Digital Controls field. Our terminal box controllers do the same thing to recalibrate the air flow sensor.

So it sounds like it is a software glitch because those that are experiencing this all have common symptoms. It happens once while running the vehicle within a few minutes of startup.

All of us do see the fan delay (recalibration?) when we first start the vehicle with AC/heat on.

So what is causing it to recalibrate a 2nd time? Find and fix that in the software and the issue will go away.

It could be as simple as telling the system to recalibrate when 1st turned on versus recalibrate (4 minutes?) minutes after start up.

Has yours done it again since the dealership discovered the issue?
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Old 08-21-2012, 02:35 PM   #115
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The weather has cooled some and I haven't used the AC. But riddle me this, if it's a software issue (not saying it isn't) why does this only happen with the AC on?
If the AC is off and the HVAC controls are set to vent and blower is on high, it doesn't happen.
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Old 08-21-2012, 05:06 PM   #116
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I'm glad I found this thread. My 2-week old 2013 JKU has experienced the same thing. I will now pay attention to times, fan speed, and if I'm on fresh or recirculated air.
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Old 08-21-2012, 06:41 PM   #117
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Add another. Mine did it while idling in a driveway in park. Blower cut off only.
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Old 08-21-2012, 09:11 PM   #118
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It happens to my 2012 Wrangler Sport also. I have less than 2500 miles on mine. It only happens once in a blue moon so I figure once enough people complain they will put out a recall. Until then since it doesn't really bother me that much I'm gonna just leave it be. When it goes in for it's first service I'll have it delt with.
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Old 08-24-2012, 04:28 PM   #119
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I had my 2012 Sahara into the dealer this morning for its first oil change. While there I told them about the AC cutting out every once in awhile. I also have he wipers turning on by them selves every once in awhile also. Dealer said they have never seen or heard of this. They said they flashed the computer and off I went. Not 5 minutes from the dealer the wipers came on and off. Back to the drawing board.
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Old 08-28-2012, 06:20 PM   #120
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Ok here's my 2˘. For what it's worth. 12 Unlimited, no auto ac mode 3500 miles. Got done a round of golf, started vehicle put fan on blast, all main vent and recirculation on (or I may have left recirc on, more on that in a minute). Anyway, swapped out my golf shoes for real kicks, got into jeep and drove quarter mile and then...... Silence. Like I turned the ac off. Then after a few seconds, it came back on full blast just like before. It was hot out but don't think that's relevant. As to the poster whos dealer told him (the old man that's been wrenching) about the recirculation thing...... maybe if you leave the recirc "on" when you shut the vehicle off and then restart it later, the system restarts or goes through this so it can determine what settings you have on ie . recirculation. Who knows....... Sounds plausible. This was the first time and probably not the last. I'm due soon for first oil change, I will take a stab with the dealer, can't wait. Shaking head. At least it ain't ticking yet. Rofl

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