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2012 VW Jetta 2.5 - Help interpreting pressure readings

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  • 2012 VW Jetta 2.5 - Help interpreting pressure readings

    I have a 2012 VW Jetta that is not cooling very well, and sometimes not at all. Static pressure with everything off is 85 psi on both high and low side. With the engine running at about 2000 rpm and the fan on high and max A/C, I get to about 45 on the low side, but only 140 psi on the high side. Was wondering if anyone could help with what is happening with my system? Low charge or bad compressor?

  • #2
    Without a temp, I can't tell you much about your static pressure reading, it would be correct for around 83 deg F.
    https://forum.aircondition.com/forum...tdi-a-c-issues
    The above thread is two or 3 down from this post and seams to cover a similar issue. I would tend to guess the compressor is not going to high displacement. Solenoid might be worth replacing before going further.

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    • #3
      Sorry, I forgot that important piece of data. Yes, the outdoor temp was right around 80 degrees F

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      • #4
        Since the system needs to be evacuated, what is the thought for just replacing the entire compressor vs only the valve on an 8 year old car?
        Last edited by gacole; 06-25-2020, 02:08 PM.

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        • #5
          Well, I'd say it is up to you. If the compressor is in good shape, and it seams to be, as it is compressing even in "low" than I would check the oil level, or drain and replace and put in the solenoid, but I am cheap!
          I am running Delco A-6's that are at least 30 years old! As long as compressors aren't run low on refrigerant or oil, they should last a long time.
          Depending on how it is located on the engine, you might be able to replace the solenoid without removing the compressor.

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          • #6
            Thank you for the advice. I have an appointment to have the system evacuated next week and a solenoid on the way. Hopefully this will get it cold again!

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            • #7
              Faulty refrigerant control valve is the culprit.

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              • #8
                Compressor refrigerant contol valve. A common failure on Jettas from 2006 - 2015

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                • #9
                  So I replaced the control valve, hooked everything back up and pulled a vacuum overnight. Everything looked good, and then when I went to recharge the system, the compressor started working and drew in about half a can of refrigerant, and then stopped. Pressure was equal on both high and low sides. So I sent it back to the shop and they replaced the entire compressor and everything is nice and cold now. I'm not sure what happened on the recharge, maybe I slugged it accidentally? The can got really cold (frost on the outside) and I saw pressure starting to build, and then it just stopped. I (literally) got cold feet on changing out the compressor myself, even though I had the old one in my hands while I was changing the control valve out. I didn't want to learn the hard way on a new compressor, so I had them finish it off for me. Since I gave them the new compressor, only ended up like $200 since I had already taken all the trim off and on that car, the compressor is only 3 bolts and 2 belts. Oh well, was a good learning experience! Thanks for everyone's help here, I appreciate it, and my wife appreciates it even more now that her car is cold again!

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