A further update...
I tried a 'factory reset' of the climate control system that I found on acadiaforum.com last night...
The reset process didn't seem to have any affect on things. Admittedly, I didn't get home until late last night and I didn't time everything precisely due to that. I may try it again this evening since I will be getting home much earlier than last night.
However, this morning I was screwing around with the settings again and noticed that when I made adjustments to the climate control knobs, I could hear the blend doors activating behind the dash....with the exception of the temperature control. As I made adjustments to the temp control (which obviously had no affect), I could NOT hear anything moving behind the dash.
This seems to further reinforce my belief that the temperature blend door is faulty. The fact that it appears to have gone bad at about the same time as the thermostat doesn't surprise me all that much...I've found that vehicles that I've owned tend to have several faults that present themselves about the same time.
My research seems to show that the different blend door actuators are all the same part, just in different locations (and some easier to get to than others). I'd rather not replace them all, so I am hoping that someone that reads this might be able to tell me which location controls the air temperature blend door...
