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Old 08-04-2014, 03:13 PM   #1
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AC stopped working...completely

Not sure what the heck could have happened? '14 ZL1. Turned the knob and absolutely nothing. Worked fine yesterday. Any ideas?
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Old 08-04-2014, 03:19 PM   #2
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Not much info your giving here bud.

It's a 14' and I assume still under warranty. Take it to the dealer and have them mess with it.
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Old 08-04-2014, 03:23 PM   #3
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Just polished my car(I'm a pro detailer). Hate to take it to the dealer and have them rub against it and swirl it up. Looks like I'm going to have to.
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Old 08-04-2014, 03:29 PM   #4
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1. check to see if the ac clutch is engaging. (ie the face will be spinning if it is)
2. if not check the ac clutch fuse and relay (top left of the fuse box)
3. check the high pressure switch connection on the driver side line by air intake.


with ac if you are not getting cold air and your compessor is turning you charge is low most likely.

if you ac compessor is not turning (clutch is not enganging) it is either a wiring issue or pressure switch problem most likely.
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Old 08-04-2014, 03:34 PM   #5
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Originally Posted by hognutz View Post
1. check to see if the ac clutch is engaging. (ie the face will be spinning if it is)
2. if not check the ac clutch fuse and relay (top left of the fuse box)
3. check the high pressure switch connection on the driver side line by air intake.


with ac if you are not getting cold air and your compessor is turning you charge is low most likely.

if you ac compessor is not turning (clutch is not enganging) it is either a wiring issue or pressure switch problem most likely.
Thank you, sir.
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Old 08-04-2014, 04:11 PM   #6
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If you detailed the engine bay maybe you got the connector for the pressure switch to pop off or come loose?
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Old 08-04-2014, 04:15 PM   #7
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theres also a low psi switch somewhere on the low side of the a/c..you can jump it, if it starts the clutch you may be low on freon...dont settle for a recharge, that stuff went somewhere..
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Old 08-04-2014, 04:22 PM   #8
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If it's low they need to do a UV dye test to see where the leak is.
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Old 08-04-2014, 04:25 PM   #9
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NO, don't put anything in a a/c system...the dye can screw up the bearings in your compressor..any decent refrigeration guy will have a leak detector...
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Old 08-04-2014, 04:38 PM   #10
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Originally Posted by Six.Two SC View Post
Not sure what the heck could have happened? '14 ZL1. Turned the knob and absolutely nothing. Worked fine yesterday. Any ideas?
Six.Two SC,

Apologies to hear about the AC not working. Would you like assistance with coordinating an official GM diagnosis. If so, feel free to message me privately.

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Old 08-05-2014, 10:00 AM   #11
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Thanks guys. Went back to the car after a couple hours and it worked just fine. The blue lights on the knobs weren't even lit when it didn't work. No power at all. This also has happened a few times with "service suspension" on the DIC. It'll come on, then go away after the next cycle. Strange stuff.
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Old 08-05-2014, 06:07 PM   #12
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If I was Obama I would fire the electrical designers at GM...how many GM trucks do you see with one driving light lit?? I replace a burned up bulb every 4 months, My Silverado burned up the fan wiring...had to get a HD aftermarket harness to get it to work..
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Old 08-05-2014, 06:47 PM   #13
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Originally Posted by Six.Two SC View Post
Not sure what the heck could have happened? '14 ZL1. Turned the knob and absolutely nothing. Worked fine yesterday. Any ideas?
Samething happened twice to my 14 ZL1 and took it to the dealership and they had to reprogram or something. since then working fine.
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Old 08-05-2014, 09:38 PM   #14
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Not sure what the heck could have happened? '14 ZL1. Turned the knob and absolutely nothing. Worked fine yesterday. Any ideas?
I have a 12 and had that happen. Had to have the head unit replaced. They said it wasn't communicating. Some times it worked and some times it didn't.
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Old 08-06-2014, 02:59 PM   #15
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My HVAC has a similar anomaly.
When the fan speed is turned to 0 and then the car is started...

The A/C blue light is illuminated, but it is not actually on, AND the recirculate is on, but not its blue light.
When this occurs, the on-screen display correctly shows that the A/C is not on and that the recirculate is on.
I cycle the A/C and Recirculate buttons and then they work back as normal.

I now just never turn the fan speed to 0.
Problem solved.
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Old 08-24-2014, 10:44 AM   #16
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This just happened to my '14 1LE today.
I only have 1,200 miles on the car. Ugh!!!!

You would think this system would be perfected by now.

Don't know when I'll get to the dealership but I think this is unacceptable.
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Old 08-24-2014, 10:58 AM   #17
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My AC did the same thing about two weeks ago. Exact same symptoms and everything. Was on my way to dealer, and stopped for gas, when fired it back up worked fine. They could not find the problem.
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Old 08-24-2014, 06:59 PM   #18
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Mine did that once the other day - all of the blue lights were off on and around the knobs... 10 minutes later, it went back to normal.
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Old 08-24-2014, 08:07 PM   #19
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Update.
Car sat for about 2 hours and all systems work now. This is one weird glitch.

Let hope this doesn't happen often.
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Old 08-24-2014, 10:10 PM   #20
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Sorry to say that it does.

I'm going to have to take mine in to get checked as well. Once out of every 10 starts, no AC. It just blows hot air. I have to stop the car, turn it off, open the door (to stop all electrical), and then turn it back on. I had to do that about 4 times in a row last time just to get it to start. Pissed me off. 1,100 miles on the ZL1. I mean, seriously?

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Old 08-25-2014, 09:12 PM   #21
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Update.
Car sat for about 2 hours and all systems work now. This is one weird glitch.

Let hope this doesn't happen often.
Zerort,

Thanks for the update and glad to hear all is well. Please don't hesitate to let me know if you begin to experience any other concerns down the road.

Kindly,

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Old 08-25-2014, 09:16 PM   #22
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I have had it happen about 4 times... system works in a couple minutes generally. I have also seemed to get it to go by rotating the on/off knob several times to the on and then off.... on then off etc... click it works.
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Old 08-25-2014, 09:33 PM   #23
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if the compressor clutch is engaging and you have a full charge you will get cold air.

if the system does not engage then it is most likely a wiring issue. most ac systems won't work if you dont' have a minimum static pressure. ~28psi or so. then there is a high pressure cutoff switch so the compressor does not blow the system up basicaly ha ha.

if it is intermitten it is 100% electrical as the system iteslef is very mechanical if it will blow cold then you need to look for the electrical gremlin.

intermitten problems are horrible to troubleshoot that why if you can see for example the compressor clutch not spinning when it happens they can look at the pressure switch or wiring.
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Old 08-25-2014, 10:06 PM   #24
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Perhaps the software mistook your car for a Z/28 and deactivated the AC.


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Old 08-26-2014, 12:21 AM   #25
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Unhook the negative on ur battery in the truck.. both black wires. . For 40 seconds. Put back on.. tighten and go check in car. Vwala. Works again
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