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Old 07-16-2012, 08:30 PM   #61
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Quote:
Originally Posted by firehawk View Post
hi, i have no problems with my jeep a/c. however the relay sounds like
it could be the problem area, many of the relays are the same so i would
swap the relay with the same type wich is used for another function, it will
take a minute to do and if the problem moves with the swap then you have
a intermittent relay and your problem is solved, if the problem does not go
away you know it's not a relay and could be the clutch on the a/c, hope this
helps, you could take it to another jeep dealer, another set of eyes may
have seen the problem and fix it in a flash..good luck...
I swapped the relay for a brand new one and 4 days later it happened again so I don't believe the relay is the problem. And evrytime its happened to me, I have not had recirc on.

Quote:
Originally Posted by stans1stjeep View Post
It's been too long since I was in HVAC, but át this point, I think it's either a software function turning off the fán, or a loose connector in the wiring. I tend to rule out software because fan cut out isn't happening on every Jeep.
From what I found searching the schematics, there are three sensors: a pressure sensor on the compressor itself, a trinary switch on the high pressure line right before the condenser, and an evaporator temp sensor.

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Old 07-16-2012, 09:06 PM   #62
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[/QUOTE]From what I found searching the schematics, there are three sensors: a pressure sensor on the compressor itself, a trinary switch on the high pressure line right before the condenser, and an evaporator temp sensor.[/QUOTE]

All three sensors control compressor function. The first is the refrigerant high pressure safety cutout. The second is new to me, and may or may not be the compressor on control. The evap temp sensor cycles the compressor on and off to maintain an average evaporator fin temp around 35 - 40 deg F, to cool the cabin and prevent evaporator icing. In a manual system, the only fan control is the switch setting on the I/P control. Since the Wrangler has a system start up delay, which I am unfamiliar with on a manual system, I'm guessing that if there is a software problem, it is related to that algorithm. The start up delay is common on Automatic Temp Control (ATC) systems and is used to make the ATC as unobtrusive to the occupants as possible, not something which is too important on a manual A/C system.

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Old 07-17-2012, 02:58 AM   #63
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Mine does the exact same thing. I really dont think it is a defect. It only happens to me when the Jeep has been running less than 5 mins, the A/C is on high, and the engine RPM's have been high but have just gone low. I suspect it is some sort of protection circuit. It really doesnt bother me at all. It has happened to me about 3 times. Its something in the software, undoubtedly. I really wouldn't worry about it.

I have a 2012 JKU Rubi with a 6 speed.
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Old 07-17-2012, 07:54 AM   #64
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Quote:
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Mine does the exact same thing. I really dont think it is a defect. It only happens to me when the Jeep has been running less than 5 mins, the A/C is on high, and the engine RPM's have been high but have just gone low. I suspect it is some sort of protection circuit. It really doesnt bother me at all. It has happened to me about 3 times. Its something in the software, undoubtedly. I really wouldn't worry about it.

I have a 2012 JKU Rubi with a 6 speed.
If it wasn't a defect, it woul happen to all Jeeps every single time they started up.
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Old 07-17-2012, 08:19 AM   #65
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If it wasn't a defect, it woul happen to all Jeeps every single time they started up.
In HVAC systems all vapor pressures and sensor feedbacks would vary greatly depending on outside temperature, inside temperature. Engine RPM. Maybe even manufacturing variations in total refrigerant charge. There are many variables. I have no clear reason. I work in process control systems. The behavior is very indicative of some sort of protection system but I can’t say exactly what.

Just like the odd HVAC blend door noises that happen sometimes after you shut the vehicle down. At first it made me scratch my head a lot, that one. People don’t entirely know why it does it but that does not make it broken.

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Old 07-20-2012, 09:08 PM   #66
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Happened again this morning but I was ready for it this time. Here's the scenario:
1) With the lowest fan speed being 1 and the highest being 7, the fan speed was on 6.
2) Engine and AC running less than two minutes.
3) Cruising on a downhill grade in 4th at about 40 mph.
4) Recirculation off.
5) When the fan cut off the orange AC indicator light in the knob stayed on and when the fan kicked back on the air was cold. Makes me believe the AC system is working fine and the glitch is in the elctroncis for the fan control.

Something else weird happened this afternoon. Been driving about 5 minutes with AC on/recirc off. Although the recirculation light never came on, the system went into recirculation on its own. Suddenly became much louder. Pulled over and popped the glovebox out. Sure enough, the accordian looking flap had moved to the position to close off outside air.
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Old 07-20-2012, 11:20 PM   #67
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Quote:
Originally Posted by SilverSport View Post
Happened again this morning but I was ready for it this time. Here's the scenario:
1) With the lowest fan speed being 1 and the highest being 7, the fan speed was on 6.
2) Engine and AC running less than two minutes.
3) Cruising on a downhill grade in 4th at about 40 mph.
4) Recirculation off.
5) When the fan cut off the orange AC indicator light in the knob stayed on and when the fan kicked back on the air was cold. Makes me believe the AC system is working fine and the glitch is in the elctroncis for the fan control.

Something else weird happened this afternoon. Been driving about 5 minutes with AC on/recirc off. Although the recirculation light never came on, the system went into recirculation on its own. Suddenly became much louder. Pulled over and popped the glovebox out. Sure enough, the accordian looking flap had moved to the position to close off outside air.
I think you are right, in a manual A/C system nothing controls the fan speed except the position of the fan switch. In these electronic systems, the fan switch is a signal source for the body controller which operates the fan. Either something is interrupting the signal to the body controller, or the controller is getting a command to shut down the fan for some other reason. The only software subroutine that affects fan operation on my Wrangler is the initial delay, which is why I suspect your issue my have something to do with that subroutine. Since this thread started I have been watching my system, no fan shut downs yet.

Not sure what to say about the recirc mode, again no automatic control in a manual system. In fact, we always had the system default to defrost/fresh as a failure condition.
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Old 07-21-2012, 08:54 AM   #68
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forgot to mention I talked to my service advisor yesterday. The shop foreman had called STAR and their response was "First we have heard of this issue". Hard to believe, but the shop foreman said he would next contact the engineers. He can talk to/email the one(s) who are responsible for the HVAC and get them looking for a cause/solution.
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Old 07-21-2012, 03:09 PM   #69
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Wiring connector problems still in my mind. Find the blower motor connector and wiggle it. I still suspect a ground fault.
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Old 07-21-2012, 05:16 PM   #70
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Wiring connector problems still in my mind. Find the blower motor connector and wiggle it. I still suspect a ground fault.
I did wiggle the harness to the blower motor and couldn't make it shut off.
I would think intermittent ground fault if the issue happened anytime the blower was on. Never happens when the AC is off and with AC on, only happens within the first 5-10 minutes of driving.

Nevertheless, I appreciate your input. We members or Jeep will probably figure it out once winter gets here and AC isn't needed any longer.
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Old 07-21-2012, 06:06 PM   #71
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I have the same problem except I have a 97 wrangler and i will be driving and it will cut out and sound loud as all can be but nothing will blow out..... The only way to get it back on is to mess with all the control switches for the a/c
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Old 07-23-2012, 04:07 PM   #72
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I have the same problem! Happened 2nd day off the lot!!! It only has 4000km on her. Going to take it into the Dealer soon when I have sometime! Sounds like alot of us are having this issue!
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Old 07-23-2012, 04:26 PM   #73
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OK...this may sound lame but....here goes. In my 98 Dodge Durango I had the same issue. Would start the engine, run for about 5-10 minutes and the blower would stop working. 5 -10 seconds later it would start again. I was out of warranty so I took it to my a/c guy. He found a vaccuum leak in one of the lines. Fixed that leak and never happened again. I'm not sure how a vacuum leak affected the blower but it did.
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Old 07-23-2012, 05:24 PM   #74
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I have an appointment at the dealer to fix some other minor issues with my Jeep and I'm going to print out this thread and take it to them so they can see that this isn't an isolated incident.
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Old 07-23-2012, 07:03 PM   #75
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Ok, AC went into recirculation mode on its own again today (except the recirc light never came on. Found the same issue with blower shutting off and going into recirc on its own on another forum: 2012 sport a/c issues... Help please - JeepForum.com
One member over there is having the AC control module replaced by the dealer.

My service advisor seems open to the idea of reading online forums to help determine a cause so I printed the posts so I can show it to him.
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Old 07-23-2012, 07:46 PM   #76
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If my research is correct, this is the AC control module.
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Old 07-23-2012, 10:35 PM   #77
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I read in another forum that replacing the manual A/C control head is all that is necessary to convert your Jeep A/C from a manual system to an Automatic system. If that's the case, there may be an algorithm in the ATC program that is being inadvertently accessed.
As a result of that thread, I'm thinking about converting to ATC, just because.
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Old 07-24-2012, 06:41 AM   #78
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I read in another forum that replacing the manual A/C control head is all that is necessary to convert your Jeep A/C from a manual system to an Automatic system. If that's the case, there may be an algorithm in the ATC program that is being inadvertently accessed.
As a result of that thread, I'm thinking about converting to ATC, just because.
The Jeeps with ATC also have a temp sensor located in the right hand side of the trim panel below the steering wheel.
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Old 07-27-2012, 01:49 PM   #79
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Same issue here. Was only worried that it was the harbinger of something worse to come. Will be reporting to my dealer. Thanks guys! Love this forum.
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Old 07-27-2012, 03:28 PM   #80
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Mine started cutting off when I am on a trail, on the pavement it doesn't do it so I am thinking a loose connection somewhere I 'll have to look at it. Maybe' it's something simple with yours also
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Old 07-27-2012, 03:41 PM   #81
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If anyone gets resolution, please let us know what it was. I am in the HVAC DDC field and am curious to what the solution is.
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Old 07-27-2012, 05:07 PM   #82
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It just happened to me. It shut off for like three seconds and then came back on. It did it twice within one minute. 2012 JK Sport S- no climate control. Also, the other day, I have electric windows and they wouldn't roll down. SOMETHING IS UP!!!
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Old 07-29-2012, 09:21 AM   #83
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I have a 2012 jk with almost 5,000 miles on it. Bought it 4/6/12. Within the past week my blower shut off 2x, just for a few seconds and within 5 minutes of starting the Jeep. It can't be "expected" to be a normal function.
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Old 07-29-2012, 01:37 PM   #84
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AC Video

Sound is sub-par but audible, for some reason when I stopped recording Uconnect said "call complete" so maybe it was rec through mic??

3/4 in you can hear it.
Only thing I did was turn off recirc (felt the decrease in air, then back on felt the increase in air) then rec and drove home about 5 min into the drive it happened.

**Well cant UL and dont want a Utube account. can someone PM me so I can mail it and then they can post it? 4meg mov file. forum says invalid
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Old 07-29-2012, 02:32 PM   #85
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Just had my ac shut by itself for three seconds. I have the standard setup no auto setting
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Old 07-29-2012, 09:45 PM   #86
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Add another jeep to the blower cutoff, happen this morning. Cutout about 2 seconds and then back on.
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Old 07-30-2012, 08:17 AM   #87
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In summary what is the conclusion?
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Old 07-30-2012, 08:33 PM   #88
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I just came back from the dealership today, and they told me, the shutdown was becuase i had recirc on for too long. Supposed to be on for no longer than 7 or so mins. Not sure if he's full of it but i will try it.
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Old 07-30-2012, 08:52 PM   #89
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I just came back from the dealership today, and they told me, the shutdown was becuase i had recirc on for too long. Supposed to be on for no longer than 7 or so mins. Not sure if he's full of it but i will try it.
in manual it states:
recirculation mode is allowed in defrost/floor(mix modes) for approximately five minutes!

so he's not totally full of it

but others on here state it happens with recirc off so....
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Old 07-30-2012, 09:14 PM   #90
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just happen to me also within 5 minutes of starting the jeep.

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