George if you could be a little more specific, where is the control valve and what does it look like. I went out and looked but I didn't see anything that might be it.
I had the problem of the fan speed control being flaky. I saw where someone had a fix for that so I did it thinking it might fix the air problem too. It fixed the fan speed problem but the air problem is still there.
This was not a problem until last Friday, and since.