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post #1 of 15 (permalink) Old 10-12-2006, 04:44 PM Thread Starter
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***AC Problem - Need Advice***

Now I did a search and all the evap related problems that came up - was causing a freon leak. I dont have a freon Leak

In my case - about 2 days ago - my AC stopped blowing cold air

I have never had a problem with my AC since I bought my car about 3 years ago - Also never did any work on it nor filled freon.

I bought the freon with that gauge and all, I check the pressure and it says 45 - so there is no freon leak unless the gauge is giving out wrong readings which I doubt.

I checked the AC compressor and when I turn the AC on - The clutch on the compressor spins.

The AC belt is not broken
My Heater Works


What could be the problem???
Any fuse or any other things that I could check before I take to the dealer.
I really dont feel like removing the dash unless its a definite evap issue.

Do you think resetting my ATC will solve the problem. I read this online, may be I will give it a try when I get of work.

"You can calibrate the HVAC doors yourself by setting the ATC temperature to 75 degrees, then hold down the Floor, Floor/Defrost and Defrost buttons at the same time unitl the display begins to blink. Release the buttons and the unit will self-calibrate and then display any fault codes that may be stored once it's done. If no codes are present, the unit will go back to normal operation."

Any other check I can do?? If my compressor or evap is bad will the computer throw a code?? My check engine light is not ON !!
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post #2 of 15 (permalink) Old 10-12-2006, 08:38 PM Thread Starter
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OK, I did the ATC calibration thing and I got the code - 26. What does 26 mean??
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post #3 of 15 (permalink) Old 10-12-2006, 09:27 PM
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I think it's bad temperature sensor.
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post #4 of 15 (permalink) Old 10-13-2006, 06:42 PM Thread Starter
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26 is ATC-26 "In car Temperature thermistor failure" and the solution is to change the ATC, however.....

OK, so I removed my roommate's ATC and put it in my car and I still get the 26 Code. When I take my ATC and check it on his car - no code.

What problem could it be now. Its definetly not the ATC??
Is there a way to reset the ATC or something??
Anymore info available on this code # 26??

How do I know if there is more than 1 problem with my ATC.
My Haynes manual tell me to press and release the Panel button to check for more codes. WHat is this panel button.
After I see 26 - no matter what button I press on the ATC - the ATC goes back to the normal functions - It does not show me any more codes.

I will step out and disconnect the battery for 10 minutes or so - this is my last hope
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post #5 of 15 (permalink) Old 10-13-2006, 07:09 PM
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I am not 100% sure, but I suspect that the codes are stored in the PCM (or somewhere else.) When I thought my ATC control head was faulty, I was getting a code 36 which is something about communications error. I plugged in a junkyard unit and got both 36 and 26. When I put my original back in, I got both codes. I also put a known good unit from TFC in, and got both codes even though this one and my original function just fine.

I'm thinking that the junkyard unit had a bad themistor, and now the code is stored and comes up no matter what unit is installed. I might just disconnect the battery for a while to see if it goes away.

The panel button is the one you would press if you want the air to come out the vents at chest level.

Keep in mind that your thermistor may be intermittently faulty, meaning that it could show OK when plugged into your friends car but still be bad.

You didn't mention whether your A/C worked properly with your frineds unit plugged in. This would be key to determine if your control is actually bad.
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post #6 of 15 (permalink) Old 10-13-2006, 07:15 PM Thread Starter
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Quote:
Originally Posted by Chief Brody
Keep in mind that your thermistor may be intermittently faulty, meaning that it could show OK when plugged into your friends car but still be bad.
You didn't mention whether your A/C worked properly with your frineds unit plugged in. This would be key to determine if your control is actually bad.
What do you mean by intermittently faulty - if the ATC is faulty, shouldn't it throw the same code on any car??

My roommates M has known AC issues and hence really cannot check to see if his AC works with my ATC.

I will try the battery disconnect trick - lets hope that it works.
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post #7 of 15 (permalink) Old 10-14-2006, 01:20 AM
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Intermittently faulty means just that. The fault is not always present-it comes and goes. Could be a marginal solder joint where the component meets the board, could be an internal fracture, could be lots of things. The damage could be due to thermal cycling of the component, physical shock, vibration, manufacturing defect, etc. Ever had an old TV that you had to smack once in a while to get the picture clear?

If the fault code is stored in the BCM, then you could move your control unit to another car and not get the fault code until the intermittent fault occurs again.
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post #8 of 15 (permalink) Old 10-14-2006, 01:26 AM
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question did you check the discharge line? mine held pressure but had a pin hole in it.. try a dye test see if its a leak...
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post #9 of 15 (permalink) Old 10-14-2006, 01:26 AM Thread Starter
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Oh ok, yeah it makes sense. I actually disconnected my battery for like 10 minutes and then connected my roommates ATC and there was no code, as soon as I connected my old one - it gave the 26 code. I guess the problem is the ATC.
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post #10 of 15 (permalink) Old 10-14-2006, 01:28 AM Thread Starter
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Quote:
Originally Posted by Mr.Dodge
question did you check the discharge line? mine held pressure but had a pin hole in it.. try a dye test see if its a leak...
Yes I did and I dont there is any kind of leak as the pressure is 45 which is the max psi
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post #11 of 15 (permalink) Old 10-14-2006, 01:31 AM
 
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I'm thinking it's nothing in the head or anything else electrical. If you turn the A/C on and the clutch engages like you said it does, then the ATC system is obviously trying to turn the A/C on. I would turn my attention to checking out the mechanical side.
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post #12 of 15 (permalink) Old 10-14-2006, 01:59 AM
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Quote:
Originally Posted by 00r/t.mopar.muscle
I'm thinking it's nothing in the head or anything else electrical. If you turn the A/C on and the clutch engages like you said it does, then the ATC system is obviously trying to turn the A/C on. I would turn my attention to checking out the mechanical side.
This makes sense, but just because the compressor is engaged doesn't mean the blend doors are in the right position. The system can make all the cold air in the world and it will never get to the passenger compartment if the blend doors are in the heat position. Also, I could be wrong but doesn't the compressor operate under certain heating conditions, like defrost?

The easiest way to tell is for him to run his friend's head that throws no codes and see if the air gets cold.
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post #13 of 15 (permalink) Old 10-14-2006, 11:24 AM Thread Starter
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Yeah it could be the something mechanical too, but my atc is also giving me the 26 code which is thermister failure.

anyway, I will check with my roommates ATC. I am waiting for a warm day to do the test. Yesterday night it was so cold out there, that it was hard to tell if the AC was working or not. The air was super cold even with AC off.

Last edited by kumiyer; 10-14-2006 at 11:27 AM.
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post #14 of 15 (permalink) Old 10-14-2006, 08:47 PM
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code 26 atc in car temperature thermister failure...... this is in my repair manual....
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post #15 of 15 (permalink) Old 10-14-2006, 08:51 PM
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Kumiyer, The pressure says 45 PSI, because your compressor is not cycling. That is the pressure built up in the line. To get a true reading, the compressor must be running. It sounds like you have a bad sensor that reads the tempreture of the Evap. Core. If that is bad its telling the Compressor to stay off because the evap. is too cold or too hot. The sensor does not know the true tempreture. If you think its the head, try it in your roomates care and see if you get a code there. If not just start the compressor buy disconnecting the plug, and jumping the compressor. See if that works... If not check the fuse and relay for the compressor in the engine compartment fuse box.

If that fails, a trip to a mechanic may be in order.

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