It appears that the dew point is quite frequently Reached in Wisconsin. In mid summer driving past a cornfield at 72°F the humidistat can turn AC on to prevent fogging. Etc.....No, I'm in Wisconsin, not humid. Turns on randomly due to lack of use maybe. So intermittent I can't pin point it. Or it's a programming glitch. Your theory then it's on all the time due to humidity with the windows down, not the case.
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