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  1. #1
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    A/C compressor doesn't kick on sometimes

    2014 5.7 Police Charger with only 3300 miles. Have tried to run the A/C periodically to keep things working properly. Now, when I switch to A/C (Max or otherwise) it doesn't usually kick on compressor. If I keep trying it will usually kick on after trying over and over "ON" and "OFF". When it does come on finally, it's ice cold, so it's cooling properly. I've tried different switches inside the car, so I don't think it's inside car problem.

    Any ideas what to check/replace?

    Thanks.



  2. #2
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    Jan 2016
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    Check the compressor fuse in PDC=its probably melted.

  3. #3
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    Seems to me if it was a fuse problem, it would never work. I suggest you obtain a wiring diagram and start troubleshooting. Usually when a compressor doesn't come on, it's because the suction side pressure is too low and refrigerant is needed but that doesn't appear to be your problem according to the symptoms you stated. There is also a high pressure switch too I believe. Anyway, some troubleshooting is required I think.

  4. #4
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    Mar 2016
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    5 years old and only 3300 miles? May have some rust build up behind the compressor clutch.

  5. #5
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    Intermittent so I seriously doubt it's fuse. Compressor and clutch look new, and I've had someone click it on for me while I'm viewing compressor and you don't hear it click or any noise as if it's getting power. It's ice cold and stays ice cold for long time (as long as I leave it on).

    I'm in Florida and car is garage kept out of rain etc.

  6. #6
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    Check the clutch gap. If it is too much, it could cause those symptoms.

  7. #7
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    Quote Originally Posted by 2005rtmag View Post
    Check the clutch gap. If it is too much, it could cause those symptoms.
    QFT.
    I have had some trucks (big rigs) come in with no ac. I turn the ac max on and tap on the compressor clutch with a small hammer. Normally itll catch then work completely fine. So i remove the clutch and remove the shim thats installed form the factory and put it back together. After that, the gap is closer and allows the clutch to grab as it should.

  8. #8
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    Without taking an exact measurement, there doesn't appear to be a gap larger than normally seen. It's a very tight gap. I mean would I need a feeler gauge? I guess I'm going to have to remove compressor?

  9. #9
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    I would jumper the clutch to see if it engages before I take if off. If you jumper it and it engages every time, it's probably not the clutch gap being too much.
    Likes DBL.DWN liked this post

  10. #10
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    I don't know what "jumper" the clutch means. Could you explain? Thanks.

    Btw, I just noticed I put this under 300 forums instead of Charger. Duh on my part, but I guess it doesn't matter so much.

  11. #11
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    Run a temporary wire from the battery positive to the clutch power connection is what I mean when I say "jumper the clutch". This would eliminate the possibility of the clutch gap being incorrect if it engages every time.

    That said, today's cars have so much electonics that the problem most likely exists in the electronics.

  12. #12
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    Quote Originally Posted by 2005rtmag View Post
    Run a temporary wire from the battery positive to the clutch power connection is what I mean when I say "jumper the clutch". This would eliminate the possibility of the clutch gap being incorrect if it engages every time.

    That said, today's cars have so much electonics that the problem most likely exists in the electronics.
    Ok I understand. Yes, I feel it's electrical too, especially since intermittent and when it is on it's ice cold for however long I keep it on. Thanks.

  13. #13
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    Dec 2019
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    If the Charger works similar to the Chrysler 300, press the recirculation button. This will cause the compressor to start cycling on and off. The a/c light may not come on. If the compressor does not cycle, you may have a faulty humidity sensor.

  14. #14
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    Quote Originally Posted by donethat View Post
    If the Charger works similar to the Chrysler 300, press the recirculation button. This will cause the compressor to start cycling on and off. The a/c light may not come on. If the compressor does not cycle, you may have a faulty humidity sensor.
    I always have it on recirculation. I can try going from outside air to recirculate/max ac. Thanks.

  15. #15
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    Dec 2019
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    You have made things more clear. By keeping it on recirculation, the compressor will not run. It has to do with outside temperature and interior settings. You will get any air,through the vents until the engine warms up. That's so cold air is not blown on those setting inside. Also to keep the windows from fogging or icing over. In the colder months this is how the system works . As the weather warms up, I don't think you will notice as much. I don't think there is anything wrong with your systems. Just put in "auto" and set the inside temperature as you wish. The heat or air will work as needed. I also run compressor from time to time, to keep the seals working and everything lubed. Just do it when the engine is up to temperature and it is a warmer day. I used to do the same thing, keeping it in recirculation.

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