Audible, I'm sorry you're having so many problems with your climate system. Keep at it- you'll find the fix.

After I had my mono valve bypassed for nearly 2 months, I got to replacing the inner diaphragm today. I am happy to report that I now have great heat at any speed, and the auto temp control seems to be working well. It's hard to believe the problems that such a small part can cause. Now if only I could get the vent buttons to work properly...