I have tried to do the diagnostic tests as suggested, but I am unable to get a readout. I have replaced the blower motor regulator, the cabin air filter and the AC relay. Now, I am getting the issue of the control unit doing whatever it wants. Any ideas?

What exactly does the system do OR not do corectly?

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Oddly enough...the problems with the climate control....which seemed like a blown blower regulator...which I had already replaced...disappeared on their own.

The day before the CC developed a mind of its own, I had traveled through serious standing water and a sustained torrential downpour. I believe that water reached some part it was not supposed to reach and just dried out on its own. However, I also did remove and clean the cabin temperature aspirator- that may have helped the "fix."

Thanks.