Just picked up the Envision a few minutes ago. Service mgr. said it turned out to be a faulty temp sensor that was intermittently sending wrong signal to the system. Worked correctly all the way back home, and responded to changes made in controls, fan speed, temp, etc. Fingers and toes crossed. It was in the shop so long, I almost forgot what it looked like, but it does have great styling, at least to my eye. Mgr. apologized profusely, and I told him I understood, he didn't engineer or assemble the vehicle. With all the changes to vehicles each year, new systems, new models, etc., problems are bound to pop up, and intermittent problems are the very worst. Just glad to have it back.