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AC compressor control problem

29K views 10 replies 5 participants last post by  budd218  
#1 ·
I've noticed a few instances where I've detected that the vents were blowing cold air (actually, getting moisture on the outside windows is what made me notice it) even though the indications were that the AC was off. Brought in to the dealer, and they said that there was likely a software update for the BCM or whatever it is that controls the compressor clutch. They verified that there was no update that fixes that problem, although they confirmed that the compressor was engaged when it shouldn't be. Basically, it's broke, be they can't fix it.

Opened a complaint with Chrysler. Seems that the dealer actually hadn't contacted Chrysler about the problem. Same dealer that couldn't fix a simple headlight issue. Have to bring the car back for "further diagnosis". I have subsequently found that it's not just my car. I saw another charger at the dealer that does the same thing. Turning the AC on and off with the button or touch screen disengages the compressor - for a while. Turning the car or then entire climate system off and on does not disengage it.

I found also that pressing the recirc button, followed by the AC button (turn off AC) will make the compressor stay engaged also. Even if you turn off the recirc, the compressor stays on. To disengage the compressor, you have to turn the AC on and then back off.

Again, I've had the AC come on all by itself on a trip on the highway even though no button pushing of any kind was done.

FYI, I've got the 4.3 display, and I keep driver / passenger synced. Not clear if that makes a difference.

Give it a try, and report back, please.

Another small EVIC bug I've found is that if you are looking at the transmission temperature, and you put the vehicle in park, the display starts showing the temperature of the coolant even though the display still says tans temp. You will see the temp jump from the ~150 F trans temp to the ~205 F or so coolant temp instantly. Just a bug, I think.
 
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#2 ·
I have the same issue with the 8.4. So does a friend with a 2012 Challenger with the 4.3.

I think you have to make sure the inside temp is set above the outside temp.

If I use auto then turn it off, the AC light comes on, so I turn it off. I go into the NAV climate and the AC is still on. I turn it off in the NAV and later the system is blowing ice-cold air.

I just turn the stupid thing off because it kills the fuel economy.

The 8.4 system was not well thought out. You have to go into the controls setting to turn on sport mode, while the traction control has a hard button. Same with the vented seat.

My friend with the Challenger works part of the week at Chrysler HQ and will ask around.
 
#3 ·
Well, I'm pissed at Chrysler now. I filed a complaint around the same time as I originally posted this. I just got off the phone with them, and they claim it is some sort of feature. They refuse to put anything in writing, but....

They say that there's a sensor around the rear view mirror (there's not, I've looked very closely) that detects temperature and humidity. If the system decides that there's a possibility of windows fogging, it will automatically turn on the AC.
A few problems with this explanation. I have the basic control set. No temperatures to be set, just how much warm or cold air, and a button to turn the AC on and off. They also said when it's in this mode, that pressing the AC button wil result in it flashing three times. Doesn't happen. The killer: driving up a highway on a really nice day - 75 - 80 degrees out, with no humidity to speak of (perfect for no AC needed) so there's not not a snowball's chance of fogging windows, the system will decide to turn on the compressor sometime during the trip. Absolutely no reason for it.

Once it's engaged the compressor for no reason, it will stay engaged through engine stop / start cycles, and turning the climate system off. It does release the clutch when the climate is turned off, but re-engages it when it's turned back on. The only thing you can do when you have caught it is turn the AC button on then back off.

If anyone else decides to file a case to get more attention to this - I guess I'm alone so far, so they could care less....

My case number is 23745349. Maybe referencing that will get someone with some knowledge to actually look at how stupid their explanation is at this point.

What is with this company that they don't actually have any way for a vehicle owner to report real issues that they don't yet know exist and get them fixed? I wonder if I can get my Camry back???:mad:

Next step EPA complaint for mis-stating the MPG? It really does burn more gas when the compressor is on.
 
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#5 · (Edited)
I have yet to hear from my friend about the issue. Since you have found Chrysler believes it is a feature, maybe the next step is to disable the compressor via a switch. A poor solution, but I agree it is a waste of fuel.

I've never had any luck with any automakers customer assistance. They really don't seem to care.
 
#7 ·
I noticed this same issue in my 2011 R/T after owning it for a few weeks. I would be driving with just the vents turned on (no AC) and the windows down and all of a sudden I would hear the compressor click on and the air would turn colder. I brought this up in the 2011 section and the general consensus was that it was the humidity sensor kicking in. I agree that there's no need for it to turn on when it's in the 70s and no humidity.
 
#8 ·
Chrysler replaced Charger

After much discussion, and MANY trips to the dealer, Chrysler finally decided that they could not repair the problem. They verified it exists, had the dealer replace every module they could, and it still did it. The dealer took the dashboard and center console apart so many times that they broke the center console on the floor.

They replaced the 2013 with a 2014. I only had to pay for the added options - 8 speed, and Bluetooth - on the replacement. Substitution of collateral on loan, so no issue there.

They don't like doing this - clearly. At one point they offered me money, but I reminded them they still had to fix the vehicle, so no-go.

Replacement car - same basic HVAC controls - works great. No issues seen in three weeks.
 
#10 ·
Might be the same issue. You should determine if the AC compressor engages, but there's no AC. What mine did was somehow related to the control of different parts of the HVAC system. AC compressor might stay engaged when it shouldn't, or system would refuse to move dampers - heat when you want AC, AC when you want heat, etc.