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Originally Posted by Atx328
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I do have INPA loaded up but I haven't used it before. This might be a good time to dip my toe into the data...I don't have any manifold gauges outside of the simple gauge that fits to the top of the recharge can. I assume that is most likely not accurate or a good idea to use for diagnostics.
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If you're willing to take about 30 minutes to learn how to use INPA to read Fault Codes in ALL Modules using "Functional Jobs", please let me know, and I will provide simple instructions and screens on how to do that. That is the "First Step" to checking the "health" of your car and takes less than 5 minutes to do once you've done it. It's also a good way to make sure you have INPA properly installed, and K+DCAN cable USB port settings correct.
That probably will NOT show anything we didn't already know, and the best way to diagnose the "once-or-twice-a-month" fault if it does NOT save a fault code is to monitor Refrigerant Pressure using INPA, as well as Evaporator Temperature and Flap Positions. I can also provide info on how to do that, which you should be able to follow & perform in another 30 to 60 minutes. If your version of INPA has German techical terminology, NOT to worry as I have translated the terminology to English for the screens needed to diagnose IHKA (A/C) issues.
George